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1. Fails occasionally. Fault 1: Resolder each connection on the line

1. Picture leans too much to one side Black line visible in the picture Fault 1 When replacing of TR7593 and 7594 they break down again immediately The voltages 148 4V are both present Replace D6594 D6593 T7594 T7593 and R3596 No picture only teletext Fault 1 Situation may occur after high voltage flash over or after lightening has struck nearby When appliance is switched on bypass R3348 for a short period of time R3348 is between pin 9 IC7350 TDA8390 and earth Picture appears after 5 mins Fault 1 CRT board has been changed unsuccessfully Thermal shock on IC7350 TDA8390 Check the chroma path and in particular the Y signal Pin 3 of IC7360 Fault 2 TEA5101 and TDA8390 have been replaced Check video signal on pin 5 of 7470 If ok check control signal 7545 base 12Vpp collector 142V If missing check 7540 2630 Picture flickers the first 5 minutes Gradually becomes less but very visible in the dark portions of the screen Fault 1 Not a standard fault Check VG2 setting and picture tube circuit Picture green and purple in the E W direction Fault 1 Replace PTC Vertical lines in the left of the picture with high brightness Fault 1 This problem occurs especially on channel 2 with weak signals with the 4 picture tube panel model Remove jumper 9302 on the picture tube panel solder on the monocarrier jumpers 9011 9020 9123 9126 9212 9320 9322 9327 and 9822 on the copper screening component side us
2. Fuse 315MA O C No voltage on this fuse after its replacement Fault 1 Check C2526 C2520 C2551 T7533 T7530 and R3550 Narrow picture in E W and N S after changing line BU and power supply BU Fault 1 Check 148V on 2631 14V on 2580 32V on 2575 200V on 6570 If ok check 7533 7530 7503 and 7500 Picture is shifted to the right Sync does not work Fault 1 Replace 7593 and 7594 S C 2546 2547 2545 2594 and 2593 must also be replaced Width is excessive and varies with brightness level Fault 1 Check C2526 6 8nF in E W circuit Maximum width no E W correction Fault 1 Check width control R3525 10K for open circuit Bottom foldover Fault 1 Check C2509 part 4822 124 40244 Poor E W adjustment Picture is narrow in the middle Fault 1 C2520 68uF and C2532 1uF dry on C1 Also check pots R3525 and R3521 Fault 2 Replace R3525 Picture is too wide Fault 1 Poor E W command Replace R3525 10K and T7530 BC847 Poor frame linearity when cold Picture is distorted vertically Fault 1 Replace C2509 2 2uF and C2506 470uF on A2 No E W correction No 14V on emitter of 7533 Fault 1 Check 6580 Check 3580 3581 3582 and 2580 Field linearity is poor and width varies Fault 1 Check C2509 2 2uF 50V in field linearity feedback network Vertical amplitude is too low Fault 1 R3515 1R is defective Also check R3508 R3509 R3510 R3511 R3523 and R3529 Poor E W correcton cannot be adjusted Fault
3. T7503 and T7502 Suspect 2506 2509 and D6502 No horizontal sync Picture is shifted to the right Fault 1 Horizontal sync circuit is defective Check T7594 T7593 and pot R3595 Otherwise check C2594 C2593 D6594 D6593 R3594 and R3593 Note Before replacing components check that storage capacitor C2546 is ok and that the solder joint of the EHT pins is in good condition Poor frame linearity when cold Picture is distorted vertically Fault 1 Replace C2509 2 2uF and C2506 470uF on A2 Field linearity is poor and width varies Fault 1 Check C2509 2 2uF 50V in field linearity feedback network Line output transistor blows occasionally Could be once a month Fault 1 Line output device must be a Philips BUSO8AF Part no 482213061265 Also replace mains on off switch as it can arc and blow chopper and line output devices Resolder scan coil plug connection Remove TX5541 line driver transformer scrape its pins and refit Also replace C2545 1 2nF 2kV C2546 8 2nF and C2550 390F If problem persists replace 1C7470 TD2579N7 Only use original Philips parts D amp D Television Cheshunt England No horizontal deflection Fault 1 Output transistor etc ok Check C2550 390nF for O C Intermittent partial field collapse Fault 1 Check chip resistor 1R in emitter of field output transistor BD234 on underside of PCB PICTURE Slight hum bar Fault 1 Check D21 27V zener Dark picture Fault 1 Replace
4. 1 Check test points 22 and 23 Replace T7533 Picture shifted to the right No adjustment with R3595 Fault 1 Check SMD transistor 7594 Slight E W distortion Fault 1 Check capacitors 2693 and 2694 Poor width regulation with brightness Fault 1 HT constant Check surface mounted capacitor C2526 8 2nF for leaks OTHER Failure of TDA4600 Fault 1 Solder C4079 intermittent connections Mono stereo display error Fault 1 Adjust the signal on pin 12 of the IC7130 to minimum video with 5132 Problems with flof TXT Fault 1 Cannot find p 811 in spite of it being sent out TXT header remains with subtitling Replace IC7800 MAB8461P W 107 with a new version MAB8461P W 196 Codenumber MAB8461P W 196 4822 209 62479 No teletext and OSD is hardly visible The regular picture vibrates if appliance is switched to teletext Fault 1 IC TDA8390 does not switch over properly and must be replaced Flash over on picture tube print Fault 1 Flash over on the picture tube panel can be caused by poor isolation of C2397 Replace C2397 with an item with codenumber 4822 121 41926 OSD disappears sometimes Fault 1 Change C 2758 and C 2702 into 10 pF Ticking sound Fault 1 Restriction NICAM only On some receivers it may be possible to hear a ticking noise in the background when the receiver is in external AV mode In cases of specific complaint the phenomena can be reduced by modifying the NICAM panel as follows 1 Remove ch
5. C2550 for S C 99 Power supply blows when put into standby Fault 1 Check chopper transistor s base drive circuit BUT18AF R3619 LOR and L5619 100 BUT11AF S C After power supply kit fitted and set run in standby OK in normal run mode Fault 1 Check D6612 and 6614 Check drive waveform to BUT11 switch on delay possibly missing DEFLECT Line pairing at top half of the picture Fault 1 Check if C2072 4uF is open circuit Field roll Fault 1 Cracked PCB left hand corner of T B PCB C2072 C2080 No control signal to IC7470 TDA and no line scanning Fault 1 There should be 9V present on pin 11 of the TDA2579 and 15625Hz on pin 15 of the TDA2579 If the frequency is incorrect check C2452 2 7nF Poor line synchronization Fault 1 Check the signal on pin 12 of the IC7470 TDA2579 as well as C2467 Raster compression Fault 1 Check 2 2mf C2509 Field bounce with VCR Fault 1 C5010 150uF and C2039 should be 0 0039uF No synchronisation Fault 1 Replace TS 7364 BC 858 5322 130 42012 IC 7470 TDA 2579 N6 4822 209 72363 Fault 2 C7904 on the SVHS board is defective At times no synchronization Fault 1 Check capacitor C2366 100 nF 4822 122 33496 No vertical output Fault 1 Frame drive transistor 7805 BC547 Circuit ref M21 Line amplitude varies according to picture content 148V does not move Fault 1 CNX83 replaced Check 7594 7593 2594 2593 and 3595 Check sync and signal line drive
6. Does not go into standby Horizontal white line LED flashes to go into standby Fault 1 Check T7502 T7503 T7500 148V on R3502 and 32V on R3578 Check raster input on base of T7500 pulse inverted at 0 5V Check power supply voltages and lines Top of TXT waves from side to side Fault 1 Check C2829 47uF on TXT panel No TXT or only first line Sometimes TXT OK Fault 1 Check TXT board for loose contacts Also check for dry SMD joints behind SAA5231 Goes dead when switched to standby by RC No standby LED Switching on and off at mains restores normal functions Fault 1 Check zener diode D6657 20V No switch on with mains switch after switch off after standby Switching on off with mains switch OK Fault 1 If OK after disconnecting plug s of speaker replace audio IC TDA1521 Does not switch to standby LED turns pink Picture remains Sound mutes Fault 1 Replace diode D6669 LL4148 No brightness no sound Raster OK Fault 1 HT OK No activity on IIC bus Replace microprocessor 7720 Random functions No picture or display Fault 1 Suspect 14V on 2580 1000uF Does not respond to commands from both RC and front panel No sound Error message F2 on screen Picture ok Fault 1 Occurs after reconstructing PSU with repair kit Check uP IC7720 If correct check 9V voltage for NICAM unit This voltage comes from cathode on diode D6661 and goes through only one black cable One end of this cable goes to the NICAM
7. Fault 1 Replace C2580 Intermittent no picture no sound Fault 1 Replace micro 7550 S C Fault 2 Replace transistor 7284 leaky in soundstage Fault 3 Replace transistor 7044 Dark screen FBT ok Sound and OSD ok Picture ok via scart Fault 1 Check TDA8390 Dark screen Green LED No display and no BUS I2C 5V on pin 42 of IC7720 Quartz ok Fault 1 Check 5V reset on T7663 BC858 lin band down left hand side of screen Fault 1 Replace C2593 10uF and C2594 10uF No video switching via scart socket Sound OK Fault 1 Replace TMP47C634 2676 USEFUL INFO Quick diagnosis A Fault information on the screen FO offtime mis Blink LED indication 58 oscilloscope Possible fault Internal RAM fault Possible def unit IC7720 B Fault information on the screen F1 offtime mis Blink LED indication M7 oscilloscope Possible fault 14V operation voltage Possible def units IC7545 R3581 IC7540 R3580 IC7470 and D6580 C C Fault information on the screen F2 offtime mis Blink LED indication 235 oscilloscope Possible fault Internal timer fault Possible def unit IC7720 D Fault information on the screen F3 offtime mis Blink LED indication 469 oscilloscope Possible fault Channel selector fault Possible def units U1000 E Fault information on the screen F4 offtime mis Blink LED indication 958 oscilloscope Possible fault EE prom faults Possible def unit IC7770 F Fault in
8. IC73 TDA1412 Check output for 12 volts No picture may be intermittent Fault 1 Check tube heaters alight If not check FS155 holder for corrosion Hum on picture Fault 1 Replace D4061 BZX79C27 Excessive brightness Fault 1 Replace IC229 TBA560 No luminance Fault 1 Replace V230 chrominance luminance control unit Fault 2 Check if D4090 zener is short circuit No picture luminance Fault 1 Check D90 on power supply for leaky No picture or sound Fault 1 LT1 rail to the IF panel is absent Replace D147 with a new diode Fault 2 Fault in the power supply The ICs CNX83A 7615 and BC817 7654 are defective Fault 3 Check T7039 and if necessary D6039 Fault 4 Voltages are fine Check IC507 12V regulator and TDA1412 Fault 5 Voltage 148V is present On pin 19 of SCART no video signal External signal supplied to pin 20 SCART is processed well Replace U1000 UV816 4822 210 10365 Fault 6 Clock pulse 8 86 Mhz on Pin 28 IC7350 is missing Replace Q1352 4822 242 70323 Clock pulse 8 86 MHz on pin 28 IC 7350 is present Replace IC 7350 TDA8390 n4 4822 209 61027 Modifications Remove R3340 Remove R3341 Change R3371 to 1 2 MOhm Change R3372 to 680 kOhm Remove D6336 Low brightness even after turning up the preset in the U200 module Fault 1 The voltage at pin 2 is very low but the 4 7V zener diode is ok Check beam limiter transistor in the power supply which is leaky Field flyback line in
9. Suspect 7470 No line deflection only a vertical line PSU switches off due to there being too much load Fault 1 Operate appliance with reduced mains voltage BUSO8AF and transformer 5549 heat up after some time Swing out transients of the line transformer visible on the oscillograms Capacitor 2550 390nF is without capacitance Line amplitude varies according to light intensity Fault 1 Line transformer E W transistor and line capacitor have been changed Change C2526 6 8nF in the E W Picture linearity is incorrect Fault 1 C2509 2 2uF is defective Only half a picture Fault 1 Fault in the vertical deflection Check C2609 and replace if necessary S C in the line output stage 7645 Fault 1 C2546 is defective Picture takes a long time to appear several mins Sandcastle ok On fuse 1534 4V instead of 14V P3525 picture width is difficult to adjust again Fault 1 Check on pin 3 of line transformer 10Vpp If ok suspect 2580 Low horizontal amplitude after protection circuit disabled by lifting leg of 6560 Fault 1 2549 defective O C Fault 2 7591 leaky Difficult horizontal and vertical adjustment and sawtooth at the side Fault 1 Change IC7470 TDA2579A Occasional stopping of frame scanning Fault 1 Transistor 7500 BC33740 cuts out at the B E junction approx 5V between B and E Intermittent vertical scanning Fault 1 Check solder joints Check on oscilloscope if 5V on C2661 If ok check T7500
10. code no 4822 320 20192 Please add to the parts list in the G110 PTV chassis service manual Defective BUT With a defective BUT always replace the chip capacitors blue at the same time Replacement of line by new reference Hooked pin G2 is touching the earth which suppresses the beam limiter and gives the effect that the tube is pumping Microprocessor overview Note uP code numbers with screening plate Mask numbers 2412 2414 2415 2416 2474 2475 4822 310 31927 Mask numbers 2675 2676 4822 310 31928 Start with interfering voltage Fault 1 Start with an interfering voltage is possible but should be handled with care Apply 5V via a 200ohm resistor to the base of T7671 Power supply breaks down Fault 1 Philips supply a complete repair kit You must replace all the parts in the kit Use kit type SBC7020 part No 4822 310 20489 Also check the values of resistors 3615 3616 3619 3652 3653 and 3654 Disconnect the line scan coil plug and fit a dummy load Start up the power supply gradually using a variac check that the 140V line doesn t rise excessively as the voltage is increased A problem in the line output stage can blow up the power supply this will be proved by the line output transistor being S C Any arcing that occurs in the mains plug the on off switch or the deguassing posistor can also upset the power supply Either way before you return the set give it a soak test in standby and with the picture Powe
11. correction C2550 390nF for S C Fault 19 Check C2546 8 2nF and C2550 390nF Fault 20 Replace mains fuse 1600 which is shattered BUT18AF chopper transistor 7625 S C CNX83A optocoupler 7614 which has failed and the four bridge rectifier diodes 6602 5 S C Fault 21 LLZ C20 diode D6657 Fault 22 Power supply ok Replace line output transformer If after this replacement part of OSD has shifted to the left with the first letter missing check width control R3524 10K for O C Replace Wickman fuse T1534 315mA Fault 23 148V is low Check line output transformer T5545 Fault 24 NICAM model Check chopper and line output transistors for S C and check C2546 Fault 25 Fuse shattered Fit power supply service kit Fault 26 HT low at 20V Set starts up when pin 3 on line output transformer is isolated Check 12V rail for S C Check Q7284 3 The appliance is tripping intermittently Fault 1 Check line output transformer diode split 4 HT varies intermittently Fault 1 Check IC2510 and R4059 15K 5 When switching on the high voltage part hums If bridge 9507 is unsoldered the TV starts No control function is possible Fault 1 Check D6638 D6653 D6644 D6669 and T7651 Fault 2 Check the microprocessor 6 No start up of PSU Fault 1 Fit complete repair set code 4822 310 20489 Fault 2 Replace TR7654 BC817 Finally check with error detection poster Fault 3 Driver transformer T5541 S C on pr
12. fail often Picture fails several times when switching on from cold condition Everything is ok after warming up Fault 1 Check C2366 Very low contrast Fault 1 Check dc voltage on pin 7 of IC7350 If this voltage does not rise above 1 7 volts there could be a fault in the BCL line Check replace T7351 BC848B 5322 130 41982 Fault 2 Check replace T7413 on the picture tube PCB BC856B 4822 130 60373 At times no picture Fault 1 Check C2366 100 nF 4822 122 33496 No picture sound OK Fault 1 Clock pulse 8 86 Mhz on pin 28 IC7350 not present Replace Q1352 4822 242 70323 Fault 2 Clock pulse 8 86 MHz on pin 28 IC 7350 is present Replace IC 7350 TDA8390 n4 4822 209 61027 Modifications remove R3340 remove R3341 change R3371 to 1 2 MOhm change R3372 to 680 kOhm remove D6336 Fault 3 Check smoothing resistor R3375 180R for O C on tube base panel and check RGB output chip IC7465 TEAS101A P Brightness too high flyback line visible Fault 1 Replace IC 7465 TEA 5101A P 4822 209 73832 Picture distorted Fault 1 Vertical pulse incorrect Check capacitor C2500 220 pF 4822 122 31965 Contrast variations with subtitling in sets with BL CRT 1 Add a SMD capacitor of InF 5322 122 31647 between pins 3 and 4 of connector 20G of the CRT panel 2 Add C2336 InF 5322 122 31647 between pins 3 and 4 of connector 14G on the mono carrier Modify R3715 into 220k 4822 051 10224 Adjust PP va
13. in tuner Fault 1 Check the adjustment on the 5035 reel Picture fault in tuner and scart Fault 1 Check the earth on the quartz sheeting and the TDA84572 Dark background and a band of colour on the right Fault 1 Check if the value of R3476 is 3 3K The sound is correct but there is no picture Fault 1 Check C2346 100nF When warm the raster pulls and the BU blows Fault 1 Check the C2459 capacitors Raster signal problem Fault 1 Check the video link on the SVHS board Sound is present but the screen is black TDA8390 exchanges the power supply voltage correctly Fault 1 Raise the G2 level and check for the eventual presence of a horizontal white line This means that the raster amplifier is defective White screen Fault 1 TEA5101 is defective Black horizontal lines Fault 1 C2500 220mf is in open circuit The video cuts out Fault 1 Check the S VHS board The picture is blurred Fault 1 Check the focus setting of the three tubes Orange spots on the right of the screen Fault 1 The CRT is defective No sound or picture Snowy screen picture with test signal Vertical interference bars Fault 1 Check the hyperband tuner UV816 Black screen Sound is correct Fault 1 Check C2346 100nf which leaks at pin 11 of TDA8390 When warm picture foldover and the line BU blows Fault 1 Check C2459 and C2460 No sound or picture Appliance appears to be in AV Fault 1 Check T7039 D6039 and T7039
14. panel Error message F2 on screen Picture ok Fault 1 Occurs after reconstructing PSU with repair kit Check uP IC7720 If ok check 9V voltage for NICAM unit This voltage comes from cathode on diode D6661 and goes through only one black cable One end of this cable goes to NICAM circuit and the other is soldered to cathode of D6661 on TV s main board Check if end of black cable which goes to diode has become detached
15. standby Fault 1 Drive signal at base is incorrect Replace D6612 and D6614 Fault 2 Replace D6646 D6649 TR7655 TR7656 and TR7654 at the same time Fault 3 Replace SOPS kit austauschen ES7059 4822 310 10708 Fault 4 Change PTC NTC 63 Thyristor pos 6670 fails Fault 1 Replace R3622 and R3623 51R with 100R Replace D6622 likewise D6669 and D6644 64 No function voltage ok Fault 1 Check D2015 for S C 65 PSU fails after a short time S C of BUT18AF Fault 1 Both BYD33M have already been replaced Order repair kit from Philips SMD parts are contained in the kit Warning Use newest variants crucial components contained Fault 2 Occasionally transistor 7654 BC817 O C 66 Power supply failure Fault 1 The complete repair kit from Philips needs to be fitted even if some of the original components give a reading which is ok Fault 2 If problems still arise with the subsequent failure of the BUT18AF chopper transistpr then there is a modification you could use Add 2 BYD73B diodes part no 4822 130 60778 in series between the b e of the chopper transistor anodes to the base Then make sure that transistor 7654 is type BC817 not type BC847 Fault 3 In the event of a failure in the switch mode power supply the switching transistor IC7625 may have failed In this case it is recommended that the opto coupler IC7614 should also be replaced Chassis 7625 code no G90AE and B BUTIIAF 4822 130 42679 G110 all BUTI8AF 48
16. the appliance is switched on Fuse 1534 315mA also fails Fault 1 2SA1359 and BC547 SMD are both dead Replace C2545 and C2546 The horizontal centering cannot be adjusted correctly It may have shifted after the appliance has warmed up Fault 1 BU508A must be changed The picture is indented horizontally Fault 1 The picture is indented The problem is worse when the G2 adjustment is turned The line transformer reverberates as well Replace the high voltage cable Excessive width Fault 1 In the case of excessive width it is possible that C2549 east west circuit is low capacity To improve reliability an alternative type of capacitor should be used as a replacement However the dimensions of this capacitor are different from the original and its mounting position on the PCB may have to be modified Alternative capacitor Ref Desc Part no C2549 10uF SOV reversible 4822 124 80275 Fault 2 Replace E W adjustment pot R2535 which is O C Vertical shift incorrect after replacing a 28 BL CRT Mount in parallel of R3512 a resistor of 2K2 4822 116 52256 or 2K7 4822 116 52263 Intermittent east west Fault 1 Transistor 7963 open circuit 2SA 1359 Circuit ref G21 Change in picture width E W etc after replacement of line output transformer depending on beam current Checked beam current limiting components Seems OK Fault 1 C2526 is defective Pincushion fault Fault 1 Check 2533 2532 1534 If ok check 7533
17. until the fault occurs again Fault 1 Fit power supply repair set SBC7020 New Version Fault 2 Replace T7654 D6646 R3616 R3615 and optocoupler 7614 with the service kit If there is ringing on the oscillogram replace C2605 Fault 3 If U148 adjuster has safety varnish also replace this 38 No voltage dark picture voltage pulsates Fault 1 Check IC2510 39 The appliance does not function fuse FS1301 2 blows Fault 1 Check D4091 and D4092 40 Appliance does not function fuse TS4037 blows Fault 1 Check D3133 TR2150 C4040 D4021 C4029 and C3135 41 BUT11 becomes defective after 3 days of use Fault 1 PTC resistor is defective Fault 2 Replace the mains diodes in the power supply Fault 3 Opto CNX83 and power supply bridge zener 5 1 V has been replaced In appliance G1 10 there is a BUTI8AF instead of a BUT11 BUT18AF 4822 130 61407 Use a BUT18AF note the codenumber a BUT18 unselected can cause problems Advice Use a Philips sops repair kit 4822 310 20489 42 Appliance works fine for hours but after switching off with the remote control the BUT18 and mains fuse go defective Fault 1 Replace the diodes of the 300V rectifier Fault 2 Check the feedback capacitor on the BUT 18 43 The output transistor of the power supply is defective BUT11AF or 2SC3973B Fault 1 Usually the cause is the CNX83A Replace the defective transistor as well as the optocoupler CNX83A Code number CNX83A 4822 130 8
18. was R3448 becomes for 25 8k2 8k2 4822 051 10822 for 28 6k8 4822 051 10682 was R3449 becomes for 25 12k 15k 4822 051 10153 for 28 12k 4822 051 10123 was R3891 1 becomes for 25 3k3 820E 4822 051 10821 for 28 820E 4822 051 10821 was R3892 1 becomes for 25 3k3 820E 4822 051 10821 for 28 820E 4822 051 10821 was R3922 1 becomes for 25 3k3 820E 4822 051 10821 for 28 820E 4822 051 10821 1 Only to be modified in teletext sets No colours at start up 50 of the time on satellite channels OK in HF and VCR Fault 1 Check or replace 7733 on the low state collector in STA Suspect 5V on 7661 and 2661 Occasionally no colour Fault 1 On the lower side of the quartz remove the screening can and resolder solder joint AUDIO Intermittent no sound Fault 1 Check for dry joints on T48 and T52 sound O P transistors No sound Fault 1 Replace IC510 TBA7500 Fault 2 Check on the IF pin 2 of TDA8425 If OV replace C2264 1560uF Fault 3 Check the TDA2579A timebase chip also check C2451 1UF which is connected to pin 18 of chip No sound or picture Fault 1 No LT1 rail to IF panel Replace D147 with a new diode Fault 2 Fault in power supply ICs CNX83A 7615 and BC817 7654 are defective Fault 3 Check T7039 and if necessary D6039 Fault 4 Voltages ok Check IC507 12V regulator and TDA1412 Fault 5 Voltage 148V present On pin 19 of scart no video signal External signal su
19. 0 81138 defective Initially no picture no sound Set comes on after a while Fault 1 Microprocessor 7200 TMP47C634N 2695 heat sensitive Check 140Volt HT rail down to 70 to 80Volts Circuit ref B6 No sound no picture no 140V on collector of 7925 Fault 1 Dry joint on pin 2 of 5921 Circuit Reference C16 and D15 No sound no picture blank raster Fault 1 7350 BC 848 Circuit reference C2 Left hand channel distortion only with Nicam reception Fault 1 Check if the TDA1543 DA converter chip is defective Sound fault which sounds like severe crossover distortion in the left hand channel Fault 1 Check the TDA1543 DA converter chip Low sound on channel A Fault 1 Electrolytic 2214 is defective Hum in sound in standby Fault 1 Replace audio IC TDA1521 No sound Picture has no picture content only OSD visible AV PB ok Fault 1 Check following components pin 9 of IC7350 should be ok FBAS operation check if FBAS present at pin 25 of 1C7350 Check via SVHS socket From there the signal goes to pin 17 of IC7425 from pin 11 of IC7425 to pin 25 of 1C7350 Fault 2 1C7470 TDA2579A is defective Audio drop out Fault 1 After changing channels most of the time the sound returns Connect 2 capacitors 100nF in parallel between pins 1 10 and the ground on the stereo decoder on the base board No picture No sound PSU hums Fault 1 S C between the base and collector on the horizontal transistor C2550 390n
20. 0 N4 in place of a TDA8390 N3 the following modification must be carried out G90B chassis Pos Version Version Code No No N3 N4 2352 12pF 15pF 4822 122 32504 3313 2M7 deleted 3336 3K3 3K9 4822 111 90571 3338 2K7 6K8 4822 111 90544 3340 3M9 deleted 3341 3M3 deleted 6336 LL414B deleted G110 chassis all versions 3340 4M7 deleted 3341 3M9 deleted 6336 LL414B deleted 3371 120K 1M2 4822 111 90409 3372 220K 680K 4822 111 90368 Protection of T7625 BUTI8AF A production change is being introduced adding two diodes connected in series between the base and emitter of T7625 anodes towards base The type no for the diodes is BYD73B service code no 4822 130 60778 Reason To increase the protection of T7625 Note In cases of specific complaint this change can be applied in service In addition check that T7654 is a BC817 and not a BC847 Control micro processors A production change has been introduced adding a shield to the control micro processor to prevent the processor being influenced by external fields In future replacements will be supplied as a kit comprising the processor shield and fitting instruction The shield will also be available separately Old mask no Code no CP90 110 TMP47C432P 8187 8188 4822 209 72038 8189 4822 209 73665 New mask no Kit code no 8188 4822 310 31849 8188 4822 310 31849 8189 4822 310 31851 Replacing the EEPROM The memory IC in these receivers has been
21. 2034 BUT11AF 4822 130 42679 BUTI8AF 4822 130 61407 2SC3973B 4822 130 60851 44 The resistors 3661 and 3662 burn in standby TS7625 is also defective sometimes Fault 1 Check 6620 3622 and 3623 and the solder joints 45 Sops power supply repeatedly becomes defective Fault 1 Replace the audio output stage IC7270 TDA1521 N4 Codenumber TDA1521 N4 4822 209 73853 46 Power repair has been replaced Same fault after 10 days Fault 1 Was a new repair kit used TR 7654 SMD transistor nust be replaced at the same time This is contained in newer kits 7654 is a BC 817 47 Appliance hums and after a few seconds horizontal BU fails Fault 1 Check 148V with load and C2546 C2545 and IC7470 Check if there are any o c near the driver transistor 48 Output transistor goes defective when switched on Fault 1 Replace HSP cable from transformer to picture tube 49 Set not regulating after SOPS re build of secondary side of PSU Fault 1 Check 30 volt line If this is only coming up to 11 volts check D6653 4822 130 80446 in secondary side of SOPS Some PCBs are marked showing this diode the wrong way round the manual may also indicate it like this Reinsert diode with the cathode going to the emitter of TS652 as indicated in the circuit diagram 50 Will not start high tension low at 20 volts Fault 1 Fault suspected in line output stage Disconnect pin 3 of LOT transformer If HT comes to normal and line drive is achieved suspec
22. 22 130 61407 7614 code no CNX83A 4822 130 82034 CNX83A 4822 130 82034 67 Cannot be switched to standby After the first attempt appliance is blocked Processor and EEProm are new Fault 1 Check 5V Check C2661 and D6665 Check Power On Reset bridge diode 6665 for a short time appliance now runs perfectly transistor 7663 CB858 can be replaced 68 After fitting full power supply repair kit set will still not work into a dummy load Fault 1 Lift one end of either L5631 or R3502 and repeat the test with a dummy load If all secondary voltages from PSU are now correct check T7594 BC848 R3596 15ohm T7591 BC858 69 No regulation set will power up from variac but may come on in standby Fault 1 C2645 1uF is low in value 70 Power supply breaks down Fault 1 Philips supply a complete repair kit You must replace all the parts in the kit Use kit type SBC7020 part No 4822 310 20489 Also check the values of resistors 3615 3616 3619 3652 3653 and 3654 Disconnect the line scan coil plug and fit a dummy load Start up the power supply gradually using a variac check that the 140V line doesn t rise excessively as the voltage is increased A problem in the line output stage can blow up the power supply this will be proved by the line output transistor being S C Any arcing that occurs in the mains plug the on off switch or the deguassing posistor can also upset the power supply Either way before you return the set give it a soak tes
23. 2475 replaces all the previous micro processors Ref 4822 209 62161 PCD8582 and X2402 memory Fault 1 Two types of memory may be fitted if the wiring is adapted 1 PCD8582 R3729 10K and C2724 2 7 nf 2 X2404 remove R3729 and C2724 Put a strap in place of C2724 Ref C2404 4822 209 73313 Replacement of TDA8451 IC7305 Fault 1 When replacing TDA8451 by TDA8451 N5 do not remove the 82K resistor between 14 and 18 on the circuit Adjustment black line matrix Note When replacing the picture tube with a black line matrix type the following adjustments have changed GR2 1 VG2 for 25 and 28 135V D16 VG2 for 25 and 28 135V G110 and FL1 0 no difference in regards to description in documentation This is valid for tubes of the type A59 or A66EAK220X13 Micro computers and screening plate Note A higher failure rate of the microcomputer has been noticed This is caused by static of the microcomputer housing The static is caused by the strong electrical field of the picture tube With all the appliances the microcomputer needs to be supplied with a metal screening plate Sops repair set Note Under the number SBC7020 a sops repair kit is available If the components are originally manufactured in SMD then replace R3622 3623 with a single conventional 100O0hm and D6622 with a conventional 1N4148 These are included in the set Diode D6653 installation sops kit Note In sops kits in which diode
24. 562 Fault 2 AFC circuit is defective Adjust or replace L5034 No search when appliance has found a station Fault 1 Check positions 5034 and 5035 Fault 2 If a picture is present ident voltage at pin 13 of the horizontal oscillator IC and at pin 16 of processor Check or replace IF filter L5034 5035 No tuner reception Search display functions well but appliance does not pick up any channel Fault 1 No varicap 33V Check D6004 33V on B4 R003 18K on B3 and R3004 18K on B2 Scanning Not stopping if channel found Fault 1 Pin 13 of TDA2579 at OV rises to 9V when signal present Check C2451 0 01uF and IC TDA2579 GEOMETRY E W correction fault hour glass picture Fault 1 Replace D133 on line panel Replace L134 if melted Replace T2150 BD238 on frame panel Replace 1A fuse in power supply Fault 2 Check for dry joints on L137 Fault 3 Check 753 7530 2526 2533 2532 Check 14V on 2580 and 1534 Cramped at bottom Fault 1 Check C2083 15uF Cramped at top Fault 1 Check C2072 4uF East west raster distortion width and shaping control do not function Fault 1 Check D3133 and TR2150 Fault 2 Dry joint on pin 14 of line output transistor Difficult to set up east west and width controls Fault 1 Check D3132 Fault 2 jumps a lot no optimal adjustment possible replace pot 3525 Small picture and volts low at F4037 130V Fault 1 Check D4048 zener diode E W output stage fails as soon as
25. 615 TDA152Q 7 Fault 8 Voltage stabiliser 7610 L785Z4CV is S C Each B19 and B18 Fault 9 C2545 1 2nF is defective burnt Also replace C2546 8 2nF Initially no picture no sound Set comes on after a while Fault 1 Microprocessor 7200 TMP47C634N 2695 heat sensitive Check 140Volt HT rail down to 70 to 80Volts Circuit ref B6 No picture Fault 1 Faulty CRT Check for a leakage between G1 and G2 No sound no picture no 140V on collector of 7925 Fault 1 Dry joint on pin 2 of 5921 Circuit Reference C16 and D15 No sound no picture blank raster Fault 1 7350 BC 848 Circuit reference C2 No picture no filament no HT Sound OK Fault 1 Drive transistor 7630 BC337 for HT transistor is defective No colour dark picture pulsating voltage Fault 1 Check IC2510 No EE picture Sound ok Fault 1 Replace C710 1000uf but there may also be a dry joint in IF block on earthing pad to can connected to a small blue surface mounted component near TR3 Resolder Red flash is seen when changing channels with VCR playback in the still or search modes or edit points in own recordings Fault 1 Reduce value of chip capacitors C2434 5 from 1UF to 2 2nf code No 4822 122 32999 These capacitors are on the main PCB adjacent to IC7425 NICAM model When using scart socket wrong picture is displayed Fault 1 Check IC7720 TMP47C634 and ensure that it is the correct version No sync pulses for 5 10 mins then ok
26. D6653 is included make sure it is fitted the right way around Valid for the new G110 SVHS as well chassis D6653 and R3652 are located here practically next to each other With the old G110 print layout the D6653 is closer to T7652 in this case the cathode of D6653 must be pointed towards pin 21 of the sops transformer 5625 If the diode is fitted incorrectly the power supply will not start up Connection of the loop system to the TV Note A problem usually occurs when connecting a loop system to a modern TV A solution is available from the hearing aid suppliers in the form of a specific loop system amplifier which is supplied from the mains and which functions with a scart or phono plug signal On the advice of a specialist a large part of the cost is usually covered by insurance Method to check the power supply without blowing the BUT18AF Place a variac between the mains and the TV Put probe of oscilloscope on the base of the power supply BU while progressively increasing the voltage of the variac Watch the base signal Microprocessor eprom screening plate Note Connect the screening plate with the side of R3733 which is directed towards the front of the chassis 4822 466 82781 Replacing the TDA8390 During production of the G90B and G110 chassis all versions the PAL decoder and RGB matrix IC 7350 TDA8390 N3 was replaced by TDA8390 N4 code no 4822 209 61027 These IC types are not directly interchangeable When fitting a TDA839
27. F in the high voltage part is S C Grey screen no picture Brightness control and video signal work normally Video signal ok at pin 25 of IC7350 Fault 1 IC7350 TDA8390 is defective Nasal sound on channels 5 and 6 Fault 1 Audio IF circuit is defective Check adjustment of coils 5052 and 5053 on the right of the tuner No sound when input connection made via 2 S VHS phono sockets Fault 1 Replace IC7905 Poor NICAM sound from left hand speaker Fault 1 Check IC7530 and IC7531 LM833 No sound Does not respond to commands from both RC and front panel Error message F2 on screen Picture ok Fault 1 Occurs after reconstructing PSU with repair kit Check uP IC7720 If ok check 9V voltage for NICAM unit This voltage comes from cathode on diode D6661 and goes through only one black cable One end of this cable goes to NICAM circuit and the other is soldered to cathode of D6661 on TV s main board Check if end of black cable which goes to diode has become detached FUNCTION Volume and brightness control inoperative Fault 1 Check IC1 SAA5010 and R49 10R Ok for a few seconds then shuts down Fault 1 D4001 7 5V zener is leaky TV does not start up Fault 1 Low frequency LF safety mode and T7284 are defective Fault 2 By disconnecting the line stage and fitting a bulb the 148V increases FBT has been replaced point S3 6 1 and 5 of the FBT have also been disconnected Check D6653 leaky Check D6649 1N4148
28. POWER 1 Fails occasionally Fault 1 Resolder each connection on the line panel Fault 2 Check the line end stage transformer diode divisor 2 Dead Fault 1 Check R4059 BZX79C27 Fault 2 Check dry joints around 3D6 2D7 15A15 15A16 and R3106 Fault 3 Check R3106 820 R2010 5K6 R4044 120K R3120 15K and R4059 15K Fault 4 HT ok Check if D2015 S C Fault 5 FS1301 2 blown Check D4091 and D4092 Fault 6 FS4037 blown Check D3133 TR2150 C4040 D4021 C4029 and C3135 Fault 7 148V power supply voltage is around 90V Sound IC TDA1521 is defective 4822 209 73853 Fault 8 By slowly turning up the power supply voltage safety switches on at about 50V Replace diode D6657 LLZC20 4822 130 81143 Fault 9 Power supply kit and C9501 already replaced unsuccessfully BUT18AF switches quickly Try replacing T7651 T7652 D6653 D6646 and D6649 on secondary side Fault 10 Replace booster capacitor BUSO8AF 10 082uF 1600V which is defective Fault 11 C2262 10uF 16V S C through which the sound protection comes into action and shuts the power off Fault 12 Check D138 on line panel and replace fuse 1A on power supply panel Fault 13 Check IC2510 TDA1590 Fault 14 Check BR101 BRY56 Fault 15 Replace transistors T85 and T86 Fault 16 No line drive HT ok Check TR7455 for dry joint Fault 17 HT is 20V Check Q7284 BC858 audio Check C2526 6 8nF in EW antibreathing bias circuit Fault 18 Check S
29. S kit Some PWBs are marked showing diode D6653 the wrong way round the manual may also indicate so Re insert diode with the cathode going to the emitter of TS7652 as indicated in the circuit diagram Set blocked no control of functions Check solder joints of resonator 1760 Does not go into standby white line red LED flashes Fault 1 5V changes constantly Zener diode D6690 is 17ohm in both directions Replace zener diode Intermittent start up Fault 1 3143 220k high resistance or O C quick start CCT Circuit ref K5 Fault 2 Check for 140V rail If ok dry joint on pin 14 of L O P T_X Circuit Ref D18 At start up goes immediately into standby 12C BUS blocks at 5V Fault 1 EEPROM X2404 is defective If mains switched off when in standby it does not start up again 9V disappear in standby light off no 5V but power supply at speed is similar to that in standby Fault 1 Check on 7661 E 5V C 9V and B 6V If not suspect 2661 6665 6662 3661 to 3663 Check 7614 Appliance starts intermittently with no standby Note The on off switch has to be operated several times before the appliance will come on Operations are then normal until the appliance is put into the standby mode then it shuts down without even the standby LED being alight Fault 1 In the fault condition the h t voltage falls to almost zero and a slight whistle comes from the chopper transformer This suggests that the power supply is in protection sta
30. and 7530 Suspect 3520 and 2520 Low UB Approx 130V instead of 148V causing insufficient picture width Fault 1 Disconnect deflection plug Load 148V with 100W lamp to check whether fault originates in PSU or line output stage Picture stretched at top compressed at bottom with black bar Picture improves when warm Fault 1 Replace C2509 2 2uF SOV Insufficient picture height which can be adjusted Poor E W Fault 1 148V and sync IC are OK Check SMD resistors 1 and 2R2 in raster output stage Varying picture width When picture is darkened it becomes too wide Fault 1 SMD capacitor 2526 6 8nF is defective E W adjustment goes straight from min to max Fault 1 Replace pots R3525 and R3521 Poor horizontal centering R3593 burns Fault 1 Replaced D6593 D6594 TR7594 TR7593 electrolytics 2594 and 2593 R3593 burnt again at switch on S C in TR7593 and D6593 Horizontal centering adjustment pot 1K and 330R O C in base Hour glass picture Picture slightly too wide Picture width adjustment pot 3525 only adjusts parts of hour glass Fault 1 Replace pot 3525 10K No E W correction fuse 1534 O C Fault 1 2549 is defective O C Raster is too small Picture contents sound and other functions OK Fault 1 Replaced raster output stage sync IC C2506 and C2509 but no result SMD resistor 1R in raster output stage O C Picture is too wide with E W fault Impossible to correct with pots adjustments do not work
31. and T7652 BC558C to see if the base voltage of T7655 OV and that of 7654 0 6V Check the control signal on 7545 If poor check 7540 and the driver transformer Also check without E W module and 1534 Fault 3 Suspect 7614 and CNX2645 or check signals on the line BU 7545 Appliance fails and later comes back unprompted Fault 1 Resolder Pin 18 of the line transformer The appliance does not function voltage is fine Fault 1 Check D2015 for short circuit Works well for a few seconds then fails Fault 1 The zener diode D4001 7 5V is leaking Tuning does not function drifts raster doubles up Vertical sychronisation fault Fault 1 It is possible that C2465 220uF was incorrectly fitted polarity at the factory With high volume the appliance switches spontaneously to standby Fault 1 Fit a 6K8 resistor on the monocarrier parallel to C2285 LOOUF After approx 20 mins operating time appliance switches off Then no Led When you switch off completely with the mains switch and wait a time appliance starts again when you switch on Fault 1 Fault was dry joints on the line transformer although chassis did not react to knocks as if it was dry joints Dead Fault 1 Remove connector G15 and connect lamp to 148V Lamp does not come on Replace TS7625 BUTI8AF 4822 130 61407 Fault 2 Built in SOPS repair kit SBC7020 Apply at the same time 2 diodes BD Y73B in series between basis and emitter of TS7625 anode to base Remove
32. capacitors on the BU By228 BYW95 and diode split Fault 3 Picture position adjustment is defective Transistor S C Resistor is defective 77 Appliance is dead NICAM models Fault 1 Check chopper and line output transistors for short circuit and also check C2546 78 Switching transistor T7625 has failed Fault 1 Check optocoupler 7614 CNX83A 79 No power HT 119V Fault 1 Replace 2645 1PF capacitor Fault 2 Replace 7594 and 7593 80 No power supply protection circuit triggered Fault 1 Replace transistor 7284 leaky in sound stage 81 Blows chopper transistor when switching on with remote Fault 1 7612 is leaky 82 Blows mains fuse after 1 2 hrs Fault 1 Replace leaky C2605 83 No quick start pulse Fault 1 Check 7305 TDA8451 Fault 2 7350 TDA8390 faulty 12V on PIN 9 when disconnected 84 No 9V Fault 1 2549 is defective O C Fault 2 Check 7350 chip transistor 12V rail on collector 85 Fails in standby Fault 1 Replace D6646 D6649 TR7655 TR7656 and TR7654 together 86 Various components burn as a result of defective SOPS Fault 1 Thyristor 6670 amongst others Replace series network of D6622 R3622 and R3623 by serial network of diode 1N4148 and resistor 100R SFR25 part no 4822 050 21001 87 Dead PTC blown Fault 1 Add a special PTC NTC Used in G110 and K40 2322 662 98012 88 No regulation on 148V pot 6635 does not work Fault 1 Check zener diode D6665 4 7V Che
33. circuit and the other is soldered to cathode of D6661 on TV s main board Check whether the end of the black cable which goes to the diode has become detached TUNING MEMORY Tuning drift after a period of time Fault 1 Check TAA550 Stuck on channel 1 Fault 1 Poor contact at pin 2 plug 40 Intermittent memory problem Fault 1 Check the wiring Poor chroma identification in Pal Secam On channels 5 6 or with VCR blue or red bands Fault 1 Check the connection between pin 4 of IC7350 TDA8390 and collector TS7316 Check TS7316 R3366 and D6336 Channels run through Fault 1 Check the micro TMP47C634N2476 482220962161 and its memory with PCD8582 R3729 10K C2714 2 7nf and with X2404 remove R3729 and C2724 Make a s c at position C2724 Does not tune on some channels Fault 1 No tuning drifting disappearanc of colour or interference on a certain channel e g channel 5 and 59 The cause is a poor earth connection of the screening can of the channel selecter Resolder the screening can Tuning unstable Fault 1 Voltage on pin 11 U 1000 Tuner fixed Replace U 1000 UV 816 4822 210 10365 Contents of memory lost Fault 1 Replace IC7770 ST24C02CP 4822 209 62098 Mount metal screening 4822 466 82781 on IC7720 with earth to R3738 No detection in automatic search Does not stop Tuner OK TDA2549 OK 33V on tuner OK Fault 1 Check 9V F1559 pin 5 of the line transformer Check micro TMP47C634 and memory PCD8
34. ck T7637 D6637 T7652 C2645 and opto IC7614 Check HT loads Lift T7545 BU508 Apply load 100W lamp and check if 148V is ok Suspect T7540 89 Intermittent start and no standby Fault 1 Check zener diode D6657 20V for reverse leakage 90 Appliance runs ok but if remote used to switch to standby appliance goes dead Fault 1 Check zener diode D6657 91 Line output transistor short circuit Fault 1 Check C2546 8 2nF 2K 92 Appliance is dead purring noise from power supply Fault 1 Replace line output transformer 93 Switch off after 1 2 min Fault 1 B56 line is high Diode 6561 is defective Part no 989401 94 Intermittently goes dead Fault 1 Despite the rivets around the joints on the line output transformer these can become dry jointed especially pin 18 95 Power supply repair kit Part no 4822 310 20489 This kit should guarantee against any further problems Be prepared to replace quite a number of SMDS 96 Takes approx 1 minute to come on will not switch to standby sound mutes but pulsating picture remains Fault 1 Replace R3617 220R on primary side of power supply 97 S C in line output stage Fault 1 If line output transistor and transformer OK check scan coupling correction capacitor C2550 390nF for S C or O C 98 Dead just buzzing Fault 1 Power supply OK Replace line output transistors TR7594 BC848 and TR7593 BC858 Fault 2 Check scan coil coupling S correction capacitor
35. connector G15 and connect lamp to 148V If lamp does not come on Replace IC7614 CNX 83a Built in SOPS repair kit SBC7020 is not available Ref Desc Part no Diode BDY73B 4822 130 60778 IC7614 CNX83a 4822 130 82034 Fault 3 Check R4059 BZX79C27 Fault 4 Check for poor solder joints in the area of 3D6 2D7 15A15 15A16 and R3106 Fault 5 Check the following R3106 R820 R2010 5K6 R4044 120K R3120 15K and R4059 15K Fault 6 Check D138 on the line plate and replace fuse 1A on the supply print Fault 7 Check lead from IC2510 TDA1590 Fault 8 Replace BR101 BRY56 Fault 9 Replace the beam current limiter transistor T85 and T86 Fault 10 Replace IC7720 TMP47C634N 2475 part no 4822 310 31844 Important also fit metal screening with earth on R3738 Poor functions Fault 1 Replace IC7720 TMP47C634N 2475 4822 310 31844 Important also mount metal screening with earth to R3738 Blocked Fault 1 No functions Replace IC7720 TMP47C634N 2475 4822 816 10129 Important also mount metal screening with earth to R3738 or 9 No function standby LED not lit Fault 1 Voltage ok at power supply output except for 5V at 1 5V Check 7661 7663 6665 and 2661 If ok check 9V on C of 7661 If not check 6644 3661 and 3662 Switches immediately to protection mode Functions OK when protection mode is switched off Fault 1 D6657 20V zener diode is defective Set does not start up after implementing SOP
36. d blocks Mount new uP IC 7800 MAB8461P W 196 4822 209 62479 on TXT Decoder Set can be turned off with RC but not turned on S B LED blinks Zenerdiode 6657 LLZ C20 4822 130 81143 OSD partly disappeared from the screen in BL sets Modify C2758 and C2702 from 12pF into 10pF 4822 122 31971 No TXT oscillator on TXT decoder does not function Add C2802 C2803 15pF 4822 122 32504 on the teletext module U1003 On some appliances clicking audible in the background when in AV external reception mode Restriction only for NICAM Fault 1 This occurence can be reduced by modifying the NICAM board in the following way 1 Remove chip resistors R3044 and R3045 and cut the solder side at pins 14 and 15 of IC7040 2 Using 100mm shielded wire connect pin 12 of IC7150 to pin 14 of the IC7040 and pin 11 of IC7150 to pin 15 of IC7040 The shielding of the wire may be earthed at pins 1 2 and 3 of IC7040 3 Connect a capacitor 4n7 between pins 20 and 5 of the IC7150 Keep the connections as short as possible Capacitor part no 4822 122 30128 When scart socket used as an input with this set sound from external source but off air picture displayed Fault 1 Voltage checks around microcontroller chip IC7720 show that pin 14 goes low when a video signal is played back via the scart socket but pin 38 fails to go high to switch over to video signal Fit a new chip TMP47C634 2676 As sound is switched by the I2C bus it is not affected b
37. e good coaxial cable Local dooming especially with high contrast Fault 1 Replace C7720 TMP47C634N 2415 with TMP47C634N 2475 4822 209 62161 Fit a 220K resistor parallel to C2349 Change R3891 R3892 and R3922 in 1K2 Check if the VG2 is set at the correct value Local dooming PP settings Fault 1 When changing the PP settings for brightness contrast etc the set values will not be stored in the memory Usually they are higher in the memory This may lead to problems like local dooming Replace microprocessor TMP47C634 24 12 with 2416 4822 209 60941 No teletext and scarcely visible OSD If the appliance is switched to teletext the regular picture vibrates Fault 1 IC TDA8390 does not switch over properly and must be replaced When switching on the appliance when it s cold it takes about 35 seconds before the picture appears Fault 1 1C7465 TEA5101A on the picture tube print is defective Only snow in the picture Fault 1 33V zener is defective if the frequency in the picture does not increase when searching otherwise the microprocessor is defective Only grey picture after being struck by lightening PSU is in working order and tuner has been replaced TXT also runs Fault 1 Replace TDA 8390 The lower half of the picture is missing D C voltages are correct Fault 1 Presumably C7470 Fault 2 Possible causes T7502 T7503 R3508 R3511 R3515 R3523 R3529 C2509 C2506 First of all check C2506 thermically Does it
38. f the THT Test Equipment voltmeter The appliance functions correctly in standard B G but the sound hums in F standard Fault 1 Check the collector T7741 OV F or 12V BG If the value is intermediate change T7741 The sound is defective Fault 1 Check C2734 and C2050 No sound during mono and on track 1 Fault 1 C7070 on the stereo module is defective In quiet sections an annoying background buzzing is audible Fault 1 Smoothing of S5600 S5605 S5606 mains filter as well as the coil and core with liquid glue or loctite No sound even with in or out scart Fault 1 Replace stereo module No sound picture OK Fault 1 Picture is present and the selection of programs functions Replace IC 7220 TDA 1521 N4 4822 209 73853 IC 7220 TDA 8405 V2 4822 209 72371 IC 7260 TDA 8425 V 1 4822 209 73213 Sound mutes spontaneously Fault 1 Mount two capacitors of 100 nF 5322 121 42578 in parallel between pin 10 of IC7220 stereo decoder and earth No mono sound Stereo sound ok No change when warming cooling or knocking on stereo module Fault 1 Check IC7170 on stereo decoder Ref Desc Part no 1C7170 U2829B 4822 209 73756 Motor boating Picture appears after several mins sound distorted Fault 1 Change capacitor 100uF 50V on the small board beside the power supply transformer No sound nor picture No line oscillation Starting voltage missing in line oscillator Diode 6455 LLZ C2V7 4822 13
39. formation on the screen F5 offtime mis Blink LED indication 827 oscilloscope Possible fault Stereo decoder Possible def unit IC7220 The fault information only appears when the appliance functions G Fault information on the screen F6 offtime mis Blink LED indication 606 oscilloscope Possible fault Audio servo amplifier Possible def unit IC7770 H Fault information on the screen F7 offtime mis Blink LED indication 164 oscilloscope Possible fault TXT decoder Possible def unit IC7800 IC7820 The fault information only appears when the appliance functions If the picture is missing the off time of the display LEDs can be checked using an oscilloscope to determine what fault has been produced The fault only occurs when the appliance functions After turning off the mains switch the fault is no longer indicated but it is still present Receivers with fastext displaying the page header continuously when set is in subtitle mode page 888 Note This has been happening since the BBC changed the CEEFAX format Only observed on BBC recorded programmes with subtitles subtitles on live programmes and on independent television are not affected Fault 1 The BBC have agreed to suppress the header on future recorded subtitled programmes However many programmes are already in the can and could be transmitted at any time with the page header not suppressed To accommodate this the teletext microcomputer MAB8461P W 107 ha
40. imary Fault 4 Check 2620 Fault 5 Check transistor Q7284 BC858 in audio protection stage Fault 6 Replace line scan coupling S correction capacitor C2550 390nF 250V 7 Snowy picture no 33V voltage Fault 1 Check the R3003 8 Resistors R3661 and R3662 are in open circuit Fault 1 Replace D6620 R3622 R3623 with a 100R resistor and a 1N4148 diode 9 BUT 18AF is defective and is destroyed when the appliance is switched on Fault 1 Check R3610 R3611 R3608 R3609 D6611 D6648 T7612 T7615 and T7616 10 The power supply is noisy in stand by Fault 1 Check L51619 11 The voltages are too low Fault 1 Check D6649 and R3649 12 BUT18AF is destroyed after some time Fault 1 4 5V should be present on the D6617 anode 13 No signal on the BUT11AF collector Fault 1 Check D6630 T6670 D6669 and D6653 Check also R3621 C2620 and the BU with 0 6V at its base 14 120V instead of 148V Fault 1 Change T7651 5 Fault 2 Check D6611 D6612 D6613 D6614 LL4148 CMS is s c when switched on Check transitors T7612 15 16 and BUT18AF CNX83A and the semi conductors before and after Plug the power supply of the TV to the variac Increase the voltage and check 148V Fault 3 Fit PSU repair set Part no 4822 310 20489 15 Sometimes the BUT18AF goes defective 16 Goes into safety mode Fault 1 T7656 is defective R3560 and R3818 O C Fault 2 20V on C2630 146V Power supply functions if line time base connector i
41. ine transformer 56 No start up 148V 20 volts Fault 1 Check line output stage Disconnect pin 3 of line ouput transformer Check if 148V goes to normal and line drive is achieved Reconnect pin 3 of line ourput transformer and try disconnecting R3281 location D4 of PCB If set starts up suspect T7284 audio protection transistor BC858 SMD 5322 130 42012 57 Switching transistor in power supply goes short circuit BUT18 The mains switch should be replaced when fitting the SOPS repair kit worn contacts in the switch can cause spikes when the set is first switched on from being cold 58 Defective switching transistor in the Sops supply Fault 1 If the switching transistor in the sops supply must be replaced it is also necessary to replace the opto coupler CNX83A For an optimal reliable repair it is advisable to replace a number of power supply components by using a sops kit SBC7020 4822 310 20489 59 Blows chopper transistor Fault 1 Check transistor 7146 for dry joints Circuit ref L6 Fault 2 Check 7654 transistor and replace 7614 opto coupler IC 60 Red light flashes for approximately 3 seconds then zero Fault 1 Check pin 14 of line output transformer for dry joint If ok faulty IC7705 TDA2579A N8 Circuit ref D4 61 No sound no picture no 140V on collector of 7925 Fault 1 Dry joint on pin 2 of 5921 Circuit Reference C16 and D15 62 Chopper transistor BUT18AF fails if appliance is switched on from
42. ip resistors R3044 and R3045 and cut the print track at pins 14 and 15 of IC7040 2 Using 100mm lengths of screened cable connect pin 12 of IC7150 to pin 14 of IC7040 and pin 11 of IC7150 to pin 15 of IC7040 The cable screens can be earthed at pins 1 2 and 3 of IC7040 3 Connect a 4n7 capacitor between pin 18 and pin 5 of 1C7150 and another 4n7 between pin 20 and pin 5 of IC7150 Keep the leads as short as possible Code no 4n7 capacitor 4822 122 30128 Mono Stereo indication switches Fault 1 Connect a capacitor 1 uF 4822 124 20722 and a resistor 1 5 MOhm 4822 111 50452 in parallel In series with this circuit a diode 1N4148 5322 130 30621 is connected cathode on R C Mount this D RC circuit between pin 3 of IC 7220 stereo decoder and earth anode to pin 3 See also Service Information 3 90 No TXT Fault 1 Replace U1003 or U1003 Desc Part No U1003 4822 212 23371 no TOP U1003 4822 212 23519 TOP Fault 2 Check C2848 Fault 3 Check surface mounted link in 12V supply line on TXT panel for dry joint Low contrast of teletext Fault 1 In cases of specific complaint the contrast in teletext mode can be increased by removing D6813 LLZC7V5 D6813 is a chip component mounted on the print side of the teletext decoder panel 1003 Teletext faults Characters wrong Fault 1 Replace U 1003 4822 212 23371 no TOP Replace U 1003 4822 212 23519 Page 811 appears spontaneously Fault 1 Decoder selects page 811 an
43. lue of the contrast control to almost maximum White area visible on right side of screen in EXT1 mode of BL sets Remove the resistors 3462 and 3464 Add a potentiometer of 47K 4822 100 11371 on the position of R3461 Ghosts and poor colours SAW filter 1016 4822 242 72374 Picture moved and a black bar in the middle of the screen Fault 1 Check solder bridge over C2460 Check Pin 12 in TDA2579 Contrast adjustment inoperative colour streaks Fault 1 Diode 6335 is defective 4822 130 80446 Noise in picture 1C7425 TDA4565 4822 209 71512 defective Dark picture and no sound Fault 1 Transistor 7545 4822 130 61265 defective as pin 5541 in control transformer was loose No picture no sound Fault 1 No LT1 rail to IF panel Replace D147 with a new diode Fault 2 Fault in power supply ICs CNX83A 7615 and BC817 7654 are defective Fault 3 Check T7039 and if necessary D6039 Fault 4 Voltages ok Check IC507 12V regulator and TDA1412 Fault 5 Voltage 148V present On pin 19 of scart no video signal External signal supplied to pin 20 scart is processed well Replace U1000 UV816 4822 210 10365 Fault 6 No clock pulse 8 86 Mhz on pin 28 of IC7350 Replace Q1352 4822 242 70323 Clock pulse 8 86 MHz on pin 28 of IC7350 Replace IC 7350 TDA8390 n4 4822 209 61027 Modifications Remove R3340 Remove R3341 Change R3371 to M2 Change R3372 to 680K Remove D6336 Fault 7 Check sound amplifier 7
44. ndary voltages Fault 1 Check D6649 and R3649 26 BUTI1AF blows after some time Fault 1 There should be 4 5V on the anode of D6617 27 Appliance only functions until the 120V is reached with the variac When the mains voltage is increased the appliance fails Fault 1 Check T7651 BC558C 28 Stand by lamp does not light up and will not switch on Fault 1 Diode 6657 29 The appliance is dead Light zooming sound near the reversing transformer Fault 1 Charge power supply only with 100W lamp If the power does not function or if it does not function well use service kit SBC7020 4822 310 20489 30 BUT 18 is defective Fault 1 Service kit has been fitted Power comes on with variac but continues regulating Pulse width meter does not function Replace all components within After rectifying Pin 19 transformer is 2V instead of 9V Pin 20 is 14V instead of 30V remaining voltages are fine Also replace on the secondary side T7651 T7652 D6653 D6646 D6649 31 Defective line transistor Note After replacement of the line transistor the appliance functions momentarily Testing the power supply with an incandescent lamp is o k Replace the line transformer and the capacitors around it checked for short circuit while charged switches into safety mode Fault 1 Check line control Appliance can go into safety mode when e g the beam current is too high via diode 6590 and TS7591 or over voltage protection via 6591 6592 fo
45. pplied to pin 20 scart is processed well Replace U1000 UV816 4822 210 10365 Fault 6 No clock pulse 8 86MHz on pin 28 of IC7350 Replace Q1352 4822 242 70323 Clock pulse 8 86MHz on pin 28 of IC7350 Replace IC 7350 TDA8390 n4 4822 209 61027 Modifications Remove R3340 Remove R3341 Change R3371 to 1M2 Change R3372 to 680K Remove D6336 Fault 7 Check sound amplifier 7615 TDA152Q 7 Fault 8 Voltage stabiliser 7610 L785Z4CV is S C Each B19 and B18 Fault 9 C2545 1 2nF is defective burnt Also replace C2546 8 2nF Fault 10 Check voltage at pin 13 of TDA2579 If equal to OV capacitor 47nF S C at pin 18 of the IC No sound or picture EHT ok Fault 1 Check IC507 12V regulator and TDA1412 No sound and blank raster Fault 1 Check TR6462 BF196 No sound TDA1521 is ok Fault 1 Check if mute is not turned on There should be OV from the base of T7286 and 7285 Pin 10 of 7220 should be high If there is sound through scart follow the audio signal 6 and 8 from 7220 and 21 and 22 from 7220 The sound fails after changing over to a different channel the sound is back Fault 1 Fit a screening on IC7720 Vertical interference bars appear on the screen No sound or picture Fault 1 Check the UV816 tuner No picture dark screen No sound or video audio scart output video and audio Does not respond to the commands from the remote control Fault 1 The 9V voltage is weak 5V Change F1559 pin 5 o
46. r E W via 6560 and 6561 32 Power supply problem When appliance is switched on BUT18AF is shortcircuited Power supply kit has already been changed Primary resistors have already been checked Fault 1 Check the power supply on the variac Replace the optocoupler and change C2625 1 5nf on BUT18AF which is short circuited Check if the LL4148 chip is short circuited when switched on Check the transistors above and below the CNX Check 3624 3626 100K 33 Appliance starts poorly and the thyristor 6670 goes defective in stand by Fault 1 C2620 open circuits When measuring on the BUT18AF the power oscillates at a very high frequency 34 BUT 18 blows at 100V on the variac Power supply transformer kit has been changed Fault 1 Check or replace the diodes and CMS transistors in the tuning unit Also check the zener 35 In irregular circumstances BUSO8AF 3 days 4 weeks are s c IC TDA 2579 C2545 1 2n C2546 8 2n C2547 22nF have already been changed Fault 1 a Completely fit Rep Kit 4822 310 20491 b Change coil 4822 157 53903 and coil 4822 156 21125 in primary PSU Fault 2 Possibly driver transformer is defective Fault 3 Replace T7654 BC 817 on the secondary side 36 LED lights up for a moment TV is dead Light on the power supply sometimes functions Fault 1 Power supply is in protection because 20V zenerdiode pos no 6657 leaks 37 Defective BUT and fuse in the PSU After replacing the appliance runs for several days
47. r supply repair set Part no 4822 310 20489 Service mode This appliance has no service mode General info Appliance manufactured in 1990 Dead P s u rebuild kit was required COLOUR No colour Fault 1 Check C6062 6070 0 33uF alignment of L5630 Fault 2 Check C2317 C2323 and C2324 Fault 3 Attach extra ground wire to clip holding crystal 4 43MHz Loss of red green or blue or excessive red green or blue pictures Fault 1 Replace V1617 the G2 controls unit No colour dark picture and HT pulsating Fault 1 Check IC2510 Loss of one colour Fault 1 Open circuit print in control unit 1617 PAL SECAM chroma identification problem Fault 1 There is an open circuit between pin 4 of the IC7350 and TS7316 R3366 and D6336 should be present Purity fault Fault 1 Repeat adjustments of the G2 voltage In VCR there are only chroma lines Fault 1 Check the circuit D6336 T7316 Chroma fault in SECAM Fault 1 C2315 must be checked No red signal Fault 1 Check C2443 No blue signal Fault 1 C2442 must be checked The picture turns red Fault 1 Check the diode D6410 on the tube board The picture turns green Fault 1 Check diode D6411 on the tube board The picture turns blue Fault 1 Check the diode D6412 on the tube board No PAL chroma Fault 1 Check the metal top of the quartz Red is the dominant colour Fault 1 Darkness level adjustment of G2 CRT is defective Orange spots on the righ
48. replaced by type ST24C02CP code no 4822 209 62098 On some receivers however the circuit will have to be modified GOOAE chassis The ST24C02CP is a direct replacement for X2402 and no circuit changes are required G90B G110 chassis all versions If the ST24C02CP is fitted in place of an X2402 no circuit changes will be required However if the device being replaced is a PCD8582P the following change must be carried out 1 Change C2724 chip capacitor 2 7n to a chip jumper code no 4822 051 10008 2 Remove chip resistor R3729 GR1 AX chassis When memory IC X2402 is replaced by type ST24C02CP the 5 volt supply must be modified as described in Service Tips 216A For the GR1 AX chassis only the ST24C02CP is supplied complete with metal shield under code no 4822 310 31886 The shield must be positioned over the EEPROM and soldered in place of link 9020 Note This IC contains all the stored settings for channels programmes and preferred customer settings Consequently when the new IC EEPROM is installed the receiver will not be tuned to a programme and customer settings will be set to minimum The set may appear dead giving the impression that the new IC is defective Alternatively some receivers may be in standby or store lock mode at switch on Whenever a new EEPROM is fitted the set must be completely reprogrammed with channels and customer preferred settings Addition to parts list The EHT cable CRT to splitter 3 is available under
49. ronise Fault 1 Check 12V on C2465 If low suspect C2580 If ok check C2466 If ok suspect IC7470 AV switching problems Scart socket is used as input sound from external source heard but off air picture displayed Fault 1 Fit a new TMP47C634 2676 chip Goes into safety mode Fault 1 T7656 is defective R3560 and R3818 are O C Fault 2 20V on C2630 146V Power supply functions if the line time base connector is disconnected If the base of T7655 is at 0 7V check safety modes Check mini fuse 1534 E W D6561 E W D6592 line transformer circuit and T7284 BC858 Red standby light then dead at switch on Collector of T7655 at OV Line transformer starts up then goes into safety mode TV starts up on the variac Fault 1 Check D6657 16V D6592 EHT T7591 tube output D6560 E W D6561 E W T8284 sound Intermittently goes into safety mode Fault 1 Check if line amplitude and raster varies If it does check C2546 8 2nF or 10nF and C2545 1 2nF on the right of the line transformer Snow on screen and no reception F4 displayed on screen Green LED lit Fault 1 I2C BUS is defective on pins 5 and 6 of IC7770 PCD8282 Remove memory tuner audio board and uP one by one Snow on screen and no tuner reception F3 displayed on screen Green LED on Fault 1 Check I2C BUS Replace tuner UV816 No switching into CCIR standard Display ok in SECAM and PAL SECAM Fault 1 Check T7741 BC848 for S C near the uP
50. s been reprogrammed to suppress the page header when subtitles are being received The new version MAB8461P W 196 is available from service under code no 209 62479 In cases of specific complaint the new version may be fitted as a drop in replacement A production change A production change has been introduced adding a shield to the main control micro processor to prevent the processor being influenced by external fields In future replacements will be supplied as a kit comprising the processor shield and fitting instruction The shield will also be available separately Old mask No Code No SS G90B G110 TMP47C634N 12412 72414 209 73222 12415 209 73854 12416 209 60941 12474 209 62161 12475 209 62161 22675 209 61152 2676 209 63504 New Mask No Kit code No eee 12475 310 31844 12475 310 31844 12475 310 31844 12475 310 31844 12475 310 31844 12475 310 31844 2676 310 31845 2676 310 31845 Shield only 55S Chassis Processor G110 TMP47C634N Code for shield 466 82781 Transformation in K only for stereo versions Fault 1 Modify the following on the stereo decoder 1171 filter 3 5MHz 2182 capacitor 680pF 2179 capacitor 6 8nF 150pF capacitor should be parallel to C2181 Television part addition to parts list The EHT cable from the CRT to splitter 3 is available under code number 4822 320 20192 Please add to the parts list in the G110 PTV chassis service manual UP TMP47C634N
51. s disconnected If base of T7655 is at 0 7V check safety mode Check mini fuse 1534 E W D6561 E W D6592 line transformer circuit and T7284 BC858 Fault 3 Abnormal pulses on line BU before going into safety mode Line transformer has been checked No S C Capacitor C2550 390nF is dry or O C in line deflection circuit Fault 4 Fuse i1534 blows after 1 min Dry joint at pin 1 of L5549 Fault 5 D6657 leaky Fault 6 Approx 0 6V at base of T7655 R3661 blows Check if D6639 1N4148 S C if so check D6669 1N4148 and thyristor 6670 SFORSD43 17 The standby thyristor blows Fault 1 D6662 near the primary side is in open circuit 18 16V flashover Fault 1 Check D2 6657 19 Smoke from 12V resistor Fault 1 Check IC7315 TDA8490 20 6616 CNX has been changed At 90V appliance functions correctly Fault 1 Use a power supply kit SBC7020 Ref 482231020489 21 Power supply crackles when power supply is low Fault 1 Check D6617 BZX85C6V2 and D6645 1N4148 22 100V power supply is approx 35V Fault 1 Check D6649 1N4148 and T7652 BC558C if the base voltage of T7655 is approx OV and that of 7654 0 6V 23 Appliance starts up with the variac until it reaches 100V and then the appliance fails Fault 1 Check leaky D6653 24 Set functions with the variac but BUT11AF blows when appliance is plugged in Fault 1 Check the circuit of D6616 R3650 R3610 D6611 T7612 T7615 and T7626 25 Very low seco
52. s if no action is taken When pressing RC at switch on LED remains lit after a few secs No picture No sound HT OK Fault 1 No 14V R3580 and R3581 are defective both 1R No function only hums Line BU is defective Fault 1 Line output transformer ok C2546 at collector of BU is defective TV blocks on 600MHZ If you do a frequency search it goes through all frequencies but does not find any channels Fault 1 Change tuner 7720 and 7770 Check on tuner pin 12 5V 11 33V If ok check on 7020 pin 23 EXT 3 8V INT 0V If ok check video signal on pin 22 Otherwise suspect 7020 Starts up again then clicks after a few mins PSU faled again Fault 1 G110 kit replaced Check power supply kit Suspect solder joints 6617 Check line BU command If ok suspect 2545 6546 6547 Check 14V on 6580 Goes into safety mode if it is left in standby then switched on via the switch Starts normally if speaker or HT O C Fault 1 Power supply kit changed Check 5V on 7661 If low check 2661 or remove audio module If ok check 2266 2209 and 2208 Occasionally error message F4 Fault 1 Remove TXT decoder Possible cause is IC7800 on the TXT decoder Part no 4822 209 62479 Flof Decoder 4822 209 62879 Top Decoder If error appears again replace LED IC7720 on the base board Part no 4822 310 31927 Error messages F5 F7 F4 occur Fault 1 Possibly IC7720 is defective Part no 4822 310 31927 Arcing Picture tearing Does not synch
53. single line in the middle of the screen Fault 1 Check the R3570 The picture fails and the screen is white Fault 1 If the value on pin 7 of the FBT is approximately 160V the capacitor has a short with a neighbouring track Snowy picture there is no 33V voltage Fault 1 Check the R3003 No picture dark screen sound or video and audio scart output Does not respond to the commands from the remote control Fault 1 The 9V voltage is weak 5V Change pin 5 on the FBT of the F1559 Test Equipment A voltmeter The screen is very white and may have flyback lines Fault 1 Check the IC 7380 TDA 8153 positioned on the CRT board video amplifier Green spot after viewing a white object on the screen Fault 1 Tune the beam current again Fault 2 Tune the G2s until the contrast reappears If this does not work change the cathode tube which has been damaged by the contrast voltage which is too high Vertical bars on channels 2 and 4 Note For sets equiped with a 4 picture tube panel On channel 2 and 4 vertical bars spook visible at the left side of the picture Fault 1 To solve this problem remove capacitors 2417 2418 and 2419 on the picture tube panel and replace jumper 9302 by a capacitor of InF 4822 122 31746 Interference lines when cold but not when warm Fault 1 Check TEA5101 A P When warm there is a raster fault on the left Fault 1 Change the IC7360 TDA8452 N3 Picture is correct in scart but poor
54. t fault on 14 volt or 12 volt line from line output stage Try disconnecting R3281 in location D4 of PCB If set starts up check T7284 audio protection transistor BC858 SMD 5322 130 42012 51 Over voltage circuit active Fault 1 Remove connector G15 and connect lamp to 148 Volt Lamp is on Replace TS7545 BUSO8AF 4822 130 61265 and replace S5545 line transformer 4822 140 10384 52 BUT 18 was defective After fitting power supply repair set BUT 18 is defective once more Fault 1 Replace Repair Set again and remove the line end stage and load with a 100W lamp It could be that the split diode is defective Fault 2 Replace Pos 7654 BC817 Fault 3 Replace optocoupler and base transistor 53 BU508 defective after switching channel when appliance is warm Fault 1 Replacing capacitors TDA and or line transformer does not solve the problem Use Philips repair kit 54 Power supply BU blows after a few days Fault 1 Kit has been changed In the primary measure the chip resistors which have changed value If BU blew several times also check those of the secondary Fault 2 Check the solder joints of the line transformer tuning capacitors Check if the power supply is stable 55 BU508 blows one min after HT transistor BUSO8AF has been replaced Picture OK during this one min Transistor does not become hot Fault 1 Check pulse on collector for max 1200 1300V Check flyback capacitor for loose leg Check connections of l
55. t in standby and with the picture 71 Set dead power supply refuses to start Also intermittent start and no standby Fault 1 Check D6657 LLZ C20 diode in the sound protection system Can go leaky 72 Nicam chassis if you get one of these sets with S C chopper and line output transistors Fault 1 Remove and inspect C2546 8 2nf 2KV Replace if there is any evidence of heat stress 73 If after fitting the recommended power supply kit the set works ok until put into standby then after a few seconds there is a pop and the BUT18AF goes S C Fault 1 Change D6646 D6649 TR7655 TR7656 and TR7654 also recheck D6614 and D6612 74 Blows chopper transistor at switch on even when all the bits in the repair kit have been fitted but the power supply works all right if brought on slowly by use of a variac Fault 1 Change the on off switch and the posistor in the degaussing circuit 75 Set is dead but the power supply works all right when tested with a dummy load Fault 1 Remove and inspect capacitors C2546 8 2nf and C2550 390nf in the line output stage Replace them if their wires are loose or there are signs that the capacitors are overheating internally 76 Line BU keeps failing Fault 1 Measure operating voltages Resolder line transformer in every case Check for dry joints Replace chip capacitor and parallel capacitor For the BU use only original spare parts 4822 130 61265 Fault 2 Replace power supply repair set BUSO8AF pulse
56. t of the screen Fault 1 The CRT is defective Poor chroma identification in Pal Secam On channels 5 6 or with VCR blue or red bands Fault 1 Check the connection between pin 4 of IC7350 TDA8390 and collector TS7316 Check TS7316 R3366 and D6336 Occasionally the colour disappears Fault 1 Screening of the crystal pos 1352 is poorly or not at all soldered It should be soldered to the component side To replace IC7350 TDA 8390 the crystal must be removed Don t forget to solder the screening of the crystal on the component side Coloured flash on channel change and VCR features Fault 1 It is possible that on the G110 chassis a coloured flash may be seen when syncs are interrupted For example when changing channels or on VCR playback in still or search modes In the case of home video recordings the edit points may be marked by a colour flash In cases of specific complaint the phenomena can be reduced by changing the value of C2434 and C2435 from 100nF to 2 2nF chip components on the main PCB adjacent to IC7425 Code no 2 2nF capacitor chip component 4822 122 32999 Coloured spots in picture local dooming Fault 1 Service solution Mount a resistor of 220k ohms in parallel with capacitor 2349 and replace resistors 3891 3892 and 3922 by 1k2 ohm types Modification introduced in products Sets with production number G05 AG04 was R3415 becomes for 25 12k 22k 4822 116 52257 for 28 15k 4822 116 52244
57. te and upon measuring voltage at base collector connection between transistors T7656 7655 Voltage here should be zero or slightly negative but is 0 7V thus shutting power supply Change diode CTV switches on but nothing happens No sound or picture on the traditional aerial On the contrary in scart with a dish the CTV has a picture but no sound No automatic search possible Fault 1 Check varicap voltage at point 11 of tuner 1000 Check on IC7020 point 23 int OV ext 5 26V Check the video output CVBS at point 14 and 22 Check 7032 and 7044 Dead volts on chopper Fault 1 Scope line transistor collector Does the line start and immediately stop if so set is in trip O C D6560 to disable trip Find it a surface mount device just in front of the metal surround beside the line transformer on the underside of the PCB If set comes on with low width look for drys on the choke 5549 and for O C wickman fuse 534 Dead LED blinks several times and then goes off Fault 1 The 14 volt supply from the line stage is missing Only pulsates once Resistor R3661 in the 5V rail is burnt Fault 1 EEPROM and possibly TMP processor are deective Set won t start up Fault 1 Check TR7652 BC857C for O C and R3652 220R for H R also check if wrong type of deguass posistor is fitted Fault 2 Check for short on the 14V line This is caused by Q7284 BC858 surface mounted device Flashing standby LED at switch on LED switches off after a few sec
58. termittent Fault 1 Check C2156 0 0022uF dry joint Striations at LHS of screen Fault 1 Add ferrite bead to wire link between TAG14 of line output No sound or picture EHT ok Fault 1 Check IC507 12V regulator and TDA1412 No picture eht ok Fault 1 D4090 4V7Z D6011 and TR2164 BC148 must be checked Repeated failure of CRT Fault 1 Replace scan coils arcing After switch on the picture is sometimes shifted and a black horizontal bar appears in the centre of the picture Fault 1 The solder bridge under chip capacitor C2460 may be the cause Leak from pin 12 of the TDA2579 timebase generator chip to the chassis Vertical striations at the left side of the picture on some receivers only Note Sets mostly affected are those fitted with a 4 version of the CRT base panel Fault 1 The symptom can be greatly reduced or cured completely by removing link wire 9302 which is situated on the CRT base panel adjacent to connection 19G This should be done in cases of specific complaints only On NICAM receivers only a further slight improvement may be achieved in a few cases by soldering links 9011 and 9126 to the earthed print on the component side of the main PCB Note The 4 version of the CRT base panel can be identified by looking for the figure 4 which follows code no 3111 253 3072 printed on the component side of the panel Vertical interference bars on the screen No sound or picture Fault 1 Check the UV816 tuner One
59. y the fault F4 appears in the display Fault 1 EEPROM and processor already replaced Runs for a short time If you switch to standby again F4 appears again LED flashes Only noise Check 5V Check power ON Reset Bridge diode 6665 temporarily If then appliance runs transistor 7663 BC858 is defective R3368 and R3369 burn up at switch on Fault 1 Disconnect pins 2 and 12 of IC7360 TDA8452 and replace R3368 and R3369 both 15ohm If they do not burn up and the 12f and 12c rails are now present replace IC7360 No drive possible via RC FB ok front controls ok Fault 1 IR receiver is defective Althought the pulses reach the processor the IR receiver cannot be controlled Replace photo transistor No picture dark screen No RC reception Line transformer ok CRT heaters lit Fault 1 Change T7663 BC858 Displays error code F1 Fault 1 Poor BUS I2C Check 14V circuit Displays error code F3 Fault 1 BUS I2C is defective Tuner does not respond Displays error code F4 Fault 1 BUS I2C is defective Check uP memory and tuner Displays error code F5 Fault 1 BUS I2C is defective Check stereo board Displays error code F6 Fault 1 BUS I2C is defective Check TDA8405 on stereo decoder board Poor OSD Unusual colour of some characters Fault 1 Micro O C on pin 16 of TDA8390 No display No picture Random functions Fault 1 Suspect 14V on 2580 1000uF No sound No response to commands from both RC and front

1. Fails occasionally. Fault 1: Resolder each connection on the line

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