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1.2. O Rpag C230 j R1006 N202 tal 4 XZE01 SW1001 O 68K m 68 470u 16V l F XZ1006 XZ901 TC4052 Ke O VIDE UT R1007 16V 22u D sw1002 o o 22K i i V gt gt L B EN c291 L252 Sw1003 O a R203 R215 5 6K R293 I Rese Ui 15uH 100 100 R294 2 P C249 A C240 gt 477 3 pero L SV 2 BOK T Juli 16V 10 cage Teese YES O AUDILIKR gt U R1010 R204 v 1 als sill 16V 22u 5 i sos loe L ol kope l awe J wil ge DOO O OSI L gt pps nevem MENU SEL ok SYS N2 52 DL MODE R Y B Y P N i Fa BELL BELL vec H H V Do TAU c239 BLACK Ro SE c L vinas R1009 XZ1007 ZX700 Lo V213 E sw DUT BLACK En a FILTER Fo FILTER CONT PULSE ID SW O UDIOCLO U o 22K je R205 2SA1015 LC4053B 4 Ki a F m E G ia l Gee SECAM Neal TAl275 16V eeu 4 7u C IN 4 43CW IN SW1006 o ven R249 R247 Y DUT R Y B Y 1D vec P N S Low GATE SYSTEM t G Z 2SC1815 560 220 BELL MON OUT OUT Fitter YO Bey IN Pass sw Y IN SCPIN WIDTH 1 0 sw ROP HO T TV AV Lesi Y gt S D D D D D D 0 O VIDEO IN ARA A1001 cup sv rc e case 15uH bi C256 nm L e wa U C259 cess s R260 625 19095 Artu L 74 16V747u Olu 33K 01u l taR il Al AUDIOCR gt IN R1002 VD1002 470 RED LED N L233 O UD CLD IN 4
3. Check VD553 C559 R437 C430 T401 C415 V411 Check T402 makes life better 2 Two None no picture no sound The failure shows that the set does not display the picture but it has noise wave or blue background or OSD on the screen This means that the circuits of power supply horizontal scanning vertical scanning and video amplification are normal and they are not considered in the repairing The failures are mainly in the small signal processing circuits Before checking these circuits a kind of practical test method is introduced It is called Signal input way The detail is described as follow We can use the resistance function of an analog multimeter connect the red pole negative in ohm scope on the circuit board ground then touch softly the test point with another pole black pole in ohm scope meanwhile observe the reactivity on the output device Note In the TV test we mainly observe the noise wave on the CRT and listen to the noise voice liking as Ka Ka from the loudspeakers a Model No CT 21FGSI Version 1 0 No picture NO Check RF signal input and adaptor 0V CheckN902 TUN101 Check N101 R968 R969 DI N201 A101 Check if A101 has input signal Check R553 N904 C973 YES Out of the 0 33V range 33V Check the VT voltage when auto searching The voltage on the C992 In the 0 33V range 33V Check the 9V voltage on A101 Check the voltage on the C992
4. AC c Sub Cont Uni Color LC4053B D902 TL24C08 E kost jA X IN4149 m escsas E Ll Sync V 16V 470u R965 SUIS RMT OUT HD ki TB1238N y LE sa 33K IK Colar r L Bright le ep ep DAO Vec 8 1418 KEY IN2 VD ste C326 be R957 usci 87UH 15p R952 R923 o Dai Test Le u TOI KEY INI 2 10K 56K El WPS y SV I R977 19 AV2 OSCe 29 4 ae 7 _Y y V C D 47K c925 vse JJ PP Pp 6 e Et qe vy BAZ SCL 13 AFC IN TEST Go 15p 250945 R914 y AET Bright AA HALF T rig pas SDA 19 SDAI XIN QE zoo ER V m ut LI V Romp EC Bus E ni Color ne 1 SCLI XOUT Ga SMHZ Clamp cuteores Delve zet KO AGC E R976 R928 RY 70K 10 BAND2 RESETG n 5 B E a 9 BANDI AVI d 8 10K J asa 2 3 4 5 15 16 17 18 19 20 ei Jl Y PC Sle Om gt Dl 8 RI45 IK R906 5 R210 4 9 3 4 Si 2 8 0 2 7 2 7 2 7 9 2 8 2 8 4 7 0 9 18 5 2 Se 9 Roso 8 TONE REMOTE G 10K CORTO C203 BEK R929 ee 100 16V7470 k 565 T DES R264 c263 L ROVER BS NENS HA Be R5 R927 Sa dan 16V 22u R202 Nok T 4700p L 7 o ae ean T ir gt 4 lt 6 VOL R SCLO 67 120p SSK 910 220 lis Re7s R273 R271 ROJI 3 5 R920 5 VOL L SDA0 8 l CEE 7 k I SU Ctr ete lek R295 Y c919 R276 R553 ali 4 MUTE S ID E e T toot 15K VD904 220 R905 1000p V275 ii 5 6K G 3 L 1N4148 ales R990 2SC945 3 B SIF1 Go es cege R973 BS R926 va R975 ik SEK 16V 100u I e o 2 MT SIF2 41 33K L901 1 V 4 VSS DD O 12uH R932 L al T 15K R974 c972 C971 E R462 R
5. Model No CT 21FGS1 Version 1 0 makes life better 12 Adjustment procedure l 2 Press D MODE key on No l service remote controller to set the set into design mode adjustment Press 4 okey to select OSD item press gt or key to adjust the OSD to the center position on the screen or press RF AGC key on No 5 service remote controller and press or key to adjust the OSD position Press D MODE key again to guit design mode adjustment The functions of the set inspection Measuring SG Eguipment User remote controller and No Preparation Before Adj Inspection procedure l Receive the Philips pattern signal Press PIC key on user remote controller to call the menu as adjusting picture quality Adjust color brightness contrast sharpness and tint in NTSC respectively and all adjustment should be right Press V key to increase the sound volume no distortion heard at maximum level press V key to decrease the sound volume no sound heard at minimum level Press POWER key to switch the set into standby status at mean time the manufactory adjustment mode is cancelled Press POWER key again the set should work in normal receiving mode Press mute DISP display PP and SLEEP key respectively the relevant function should be normal Press S OUT key on No 5 service remote controller to set default value that stored in E PROM on the chassis for product shipment Model No CT 21FGS1 Version 1 0 make
6. 0 33V SV Check R102 C102 TUNIOI The voltage between VL and BH vary from OV to 9V or not when auto searching Check V975 D901 R973 R975 R975 R990 C971 C972 C991 makes life better 2V Exam the voltage of AGC on TUN101 without antenna Check R119 R206 R101 C104 TUNIOI N201 Ju 3 8V Test the voltage on pin 1 3 17 28 360f N201 9V Check V922 C203 C282 C263 VD261 C261 0V Check N902 N201 C203 C282 R263 Test the voltage on pin 46 of N201 C261 VD261 R261 SV YES Observe if there is snow noise wave disturbance on the CRT via using Signal input way by touching pin 6 and pin 8 of N201 Check N902 N201 YES Observe 1f there 1s snow noise wave disturbance on the CRT via using Signal input way by touching pin 47 of N201 NO YES Observe 1f there 1s snow noise wave disturbance on the CRT via using Signal nput way by touching pin 35 of N201 Check V251 V212 V231 N201 NO Observe if snow noise wave disturbance on the CRT via using signal input way by touching pin 39 of N201 YES Check if voltage on pin 48 of N201 is 4 6V Test if there is the sync signal on the pin 36 of N201 Check N251 N201 R255 L251 2V Check C212 TUN101 N201 Check R321 VD436 T402 R462 C452 Observe if these 1s snow noise wave disturbance on the CRT via using Signal input way by touching pin 18 19 20 of N201 NO YES NO NO Check R273 R271 R272 V602 V612 V622 N201 Model N
7. 4 98V 4 98V YES YES Check the voltage on the pin 33 of D901 Check T501 VD553 R558 Check R939 VD922 Check D901 Check the voltage on the emitter of V925 4 98V 4 98V r Check R937 Check the voltage on the positive pole of VD921 4 98V 3 6V Check VD921 R933 Check R932 R937 V925 Model No CT 21FGS1 Version 1 0 makes life better 6 No OSD On Screen Display This failure is usually cause by the circuit of character generated and located Most of reasons are that the horizontal and vertical flyback pulse signals do not come to UOC We can judge this failure by measuring the wave of the character in an oscilloscope The detail checking and repairing steps are as follow Check the wave on the pin 4 of FBT and N402 pin7 NO Check FBT T402 N402 Check V922 V923 R914 VD436 R449 D901 YES Model No CT 21FGS1 Version 1 0 20 makes life better 21 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT A Pin functions of N201 TB1238AN 3 JIFVCC oo 9V supply input for IF amplify circuit 9 5 IFGND______ Ground for IF amplifiter circuit 0 JIFIN JIFsignalinput 0 8 RFAGC o RFamplifier AGC control voltage output 56 9 JIFAGC IF amplifier AGC filter 44 12 WCGND Ground Y C signal processor 0 13 YSYM I Y switch signal input JO 14 EXTRIN o Character R signal input 0 9 15 EXTGIN Character G signal input 09 Character B signal input o 17 RGBVC
8. 110f N252 Check VD552 R910 C700 T501 N701 24V Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 2 of N711 NO Check SP301 SP302 N711 Check D901 N252 N203 9V Model No CT 21FGSI Version 1 0 makes life better 3 Only horizontal line in the middle of the screen If vertical deflection circuit does not work this kind of failure will happen In deflection yoke there only has horizontal sweeping the electron beam in the CRT only moves in the horizontal orientation so form this failure While checking horizontal and vertical deflection circuit s failure we have better to use an oscilloscope Abnormal The waveform on the pin 24 of N201 Check C272 R279 N201 Normal 0V The voltage on pin 3 of N402 24V Measuring the waveform on pin 4 of N402 Check VD557 R550 V554 N402 Normal The deflection yoke on the CRT Check R908 C448 N402 N201 Abnormal Measuring the waveform on pin 2 of N402 gt gt gt Check N402 Abnormal Normal Measuring the waveform on the deflection yoke Abnormal Check R442 C413 VD433 XZ411 deflection yoke Model No CT 21FGS1 Version 1 0 17 makes life better 4 Only vertical line in the middle of the screen This is a dangerous failure lt probable causes flashover and smoking inside the set Don t let your TV work for a long time as this failure appears Because the electron beam can not move in the horizontal orien
9. 33K 220p 220p SIS D901 C904 985 R933 R113 R449 C450 Case 6 8K 102 R992 ZU 16V 47u 2SA1015 22K ZI l e 15K 10K 10K EKS CMSSN Fast Sick R114 15K 500V 1000p 500V 3900 gt R984 10K VD971 LI V103 VD436 E 560 R938 NDE 280545 RDS 1EB2 L JL I e BI Lco s Het RD3 6L 22K v102 S MESS C992 C991 C976 al 1N4148 0 014 280945 Olu Olu 16V 47u L L L H y TP101 V D AGC y XZ411 RI19 o i C104 1k ES R101 R206 fia 220K 33K L102 Lala A101 124H T ERA o TUNER C103 AUDI GE UVAS L V r T 16V 100u NIDI LA7910 N VERTICAL Re Fee AGC VT BU BH BL MB IF o J o O BU BH IN IN GNDVCC1 BL NC VCC2 RI06 cue y DXE HS HOHS HOH HE NHS aa 6 01u L 3550 R108 R107 de R970 D GJ XZ701 nem 4 7K LI 220 2101 Ta LA7830 v102 C114 E Le 47K UU RA cioa C103 C101 C107 R968 22K Ru cree o SHP IL 5205 V OUT V UP VIN BLK Vcc V PULSE TP604 GND gt TP60S lt GND Olu 74 741 4 74 4 70 R969 22K 2 jk Colo ene S I Q El CHE C116 R111 R115 Re79 pe PSS 3 gew AU else vo l L SPEAKER Gas P 2SC2216 7 xs261 xs602 Bes li 33V 47u L C701 G 2W 12K L cus R900 700 Olu L ES coe7t top 35V 3300 R908 IK B SI 7 SHE SP702 XZ711 P GP10 5 O 1 VD433 VD434 GP10D FR104 VD557 E Da gt an A 3 R OUT R625 GP10D cad A g CUD KT H OHO e 135V 10004 ene G OUT Roos A gt L 9V Recs IK gt CRT L R443 lt R442 Tears OD OD HS pour R615 e ni T Se ze R448 ESV 1000u l Sea Ici
10. RXC945XX T 2SC945 2SC1815 2SC536E ZOI SAWF 1F38BIM 1333L FUSE o FXXX0020 IRICO 54SX380Y22 DC01 Model No CT 21FGS1 Version 1 0 AKIRA makes life better CIRCUIT DIAGRAM
11. in this receiver is the CRT To prevent X ray radiation you should use the same type of CRT when replacing it 3 Some components used in this receiver have safety related characteristics preventing the CRT from emitting X ray radiation For continued safety replacement component should only be made after referring the Product Safety notice below SAFETY PRECAUTION 1 The high voltage in the TV reaches to 22KV when the TV is in operation Be more careful during opening the back cover a The high voltage existing in the TV is very dangerous Refer servicing to qualified personnel only b Before removing the high voltage cap Discharge the anode of the CRT and the chassis in case of electric shock c Wear a pair of goggles when handling the CRT to avoid broken pieces damaging your eyes d Do not hold the CRT neck in case of causing damage to the CRT 2 When the power cord needs replacing use the same one as that provided by AKIRA factory 3 Voltage exists between the hot and cold ground when TV is in operation Install a separation transformer during repairing or connecting to any tester for the sake of safety The power of the separation transformer should be beyond rated overall power 4 When replacing a burnout fuse use the one with the same specifications as the original 5 When replacing old wire wind new one round the shaft to weld When replacing components with safety in performance use the same type as that specified by
12. 06 37 VLIN o Vertical line of SH OB 39 VLIS Vertical line deflection of 60 Hz 00 41 HAITI o 60HzSIZEZOOMMWIDEV 0 43 SRY SECAM R Y Black 08 46 HAFC JAFCgain 00 Model No CT 21FGS1 Version 1 0 26 makes life better 4 o BRTS Sub bright difference 00 SI MODO Factorydata 43 32 MODI Factory data FS 5 MOD2 Factory data OE 34 SELF TBI238ANPAQUTselet JO 55 SELF VOC Selfadjust VCD initial data 80 56 JSELFAGC Selfadjust AGC initial data 59 JSELETNIC Selfadjust TNTCinitial data 00 60 T SELF COL I Selfadjust COL initial data 20 61 OSD OSDpositen 6e om Factory Data O The BUS DATA for 87CK38N 2B46 6 CNTX SubContrasMax 3F 8 COLC Sub Color Center NTSC 4 9 TNIC SubTintCente 4 2 SCNT o Sub Contrast B 4 JENTN o Sub Contrastmin 00 18 COLN Subcolormin 0 Model No CT 21FGS1 Version 1 0 27 makes life better V C D mode data 0 V C D mode data 31 HPOS Horizontal center of 50 Hz VP50 Vertical centering of 50 Hz 33 Vertical amplitude of 50 Hz C 34 Horizontal centering difference of 60 03 Hz 35 02 36 02 37 VEN Vertical lineofS0Hz OP 39 VLS Verticallinedeflectionof60Hz__ 00 4 HAITI 60HzSIZEZOOMWIDEV 00 42 SBY SEC
13. 1 Version 1 0 makes life better L OUG R OU0 a LINI O N252 CD4053BE 5 RINI 6 NOG VINI L LIN2 ES 13 N203 CD4053BE AA PYY UDIO AMPLIFIE o T L 701 AN5270 2 12 14 15 BI AUDIO AMPLIFIER gi R a AN5270 SIF TRAPS 2235 2238 SIF BPS 2231 2234 V IN2 O SMALL SIGNAL BY G Li PROCESSOR RES 1 PUNIO na N201 VIDEO TUN101 F 34 3 a E 1B1238AN 3 AMPLIFIER 2 20 BV 602 V612 V622 CO as 8 vor 5537 vor X 2486 El OBA E FIELD OUTPUT Das POWER AMP SCLI A N402 LA78040 SDAI l ST24C08 AC150 260V POWER SUPPLY Resistance disturbance C501 L502 50 60Hz Model No CT 21FGS1 Version 1 0 LVAH bire i HORIZONTAL FBT T402 rectification DRIVE BSC25 VD503 VD506 V444 makes life better 6 SAFETY INSTRUCTION Warning Before examining and servicing this chassis read carefully the following safety instruction X RAY RADIATION PRECAUTION 1 The EHT must be checked every time the receiver is serviced to ensure that the CRT does not emit X ray radiation as result of excessive EHT voltage The nominal EHT for this receiver is 22KV at zero beam current minimum brightness operating at AC 220V The maximum EHT voltage permissible in any operating circumstances must not exceed 25KV When checking the EHT use the High Voltage Check procedure in this manual using an accurate EHT voltmeter 2 The only source of X RAY radiation
14. 2EB3 c353 S VAS L a CD VAN Il A R550 16V7 d0u 35V 47u SCREEN sli HEATER I w501 e E R634 3 i F501 vD516 ni 4 is ES V631 pese A R526 A 1 GND 4 315A ZN 1N4148 560 salas K 2SA1015 L O A 5 2 2K v512 VD558 1N4148 1N4148 C631 a7 x 250V BIL esc3807 i 22 c632 R633 C634 R635 47u 250v nedo GND I ac PLUG ANsvwso VISSE V503 Rozi 10 mere 16 4707 220 10u 16V me 01733 POWER SV o el 0317 FRIOS ASSE ih T RSIS C515 nec v921 y 0598 see bel 22K d 012u 2SB764 I iev iou a au gt gt gt El V924 ZNE ZN 25V 1000u R935 x R939 10K LIVE AREA fol ev 130 15K UL lea 1000p 250VAC R930 R913 al L 10K 15K T C933 nm m n L I E NEM x us li L N VD975 GND 0 01 C552 G av 220 RD12ESB1 MU ed VI 470U 35V T NR Loss Vo eli RDS1EB2 T16v 470u cs3e 16V 470u NOTICE SINCE THIS IS A BASIC CIRCUIT DIAGRAM THE VALUE F COMPONENTS ARE SUBJECT 1 BE CHANGED FOR IMPROVEMENT CAUTI THE COM NENTS WITH A IN THE SCHEMATIC DIAGRAM WHICH HAVE SPECIAL CHARACTERISTICS IMPORTANT FUR SAFETY SHOUD BE REPLACED NLY WITH YPE IDENTICA THOSE IN THE GIGIAL CIRCUIT Model No CT 21FGSI Version 1 0
15. 7UH R216 R234 ai CFRE E ri 100 220 lito SEL s 16V 4 7u ee0 TE 100 mn L g 1 A nee R217 vet vegi Re3e i vasi R253 i ie 100 25C945 NE gt c227 META C223 R201 L231 para jq 100 4 7u XZ1001 gt 2 8 euH 2SA1015 IU 100 dale z e Z236 R244 ki I 3 6 0MHZ 220 isa VIDE INI o 3 555 13826 Rese in L cape ta 0 100 LU 535 106 TI si R219 3 150 ES MZ ce33 BE E C251 RE T 5 0 01u R251 109 d 7834 l Fsh Raja R237 C231 56K a ci c208 poo P L 6 0MHZ C214 C217 e S i gt L 820 0 47u JO gt L232 ce19 C221 TX 17 C213 L R211 IK 8 e a 0265 AUDIOCR gt IN 5 4 7u 16V caza prese Eon C234 Z233 100p olu azul cia ty i 8 6288 ia 220 R L IR Le e 1 6 16V 10u 100 2237 igop qu SMHZ i ceig sL Cele d i 3 r Olu C264 i E a E 0261 VD261 5 5MHZ cose ini 16V eeul 16V710u iz T 022u 2 ac e E 16V 100u RDS 1EB2 ao 7 100p 1 IUT TO 148 42 156 Bol Jo 10 31 6 9 2 9 2 5 5 2 7 0 2 0 1 8 4 5 15 35 IK ds e m SE SG m Dm 40 01 10 393 GG 9 3 D 5 BOS OES ce70 AUDIOCL gt INI G 16V 10u S SMHZ T 9 ES em 8 HCorrec p rmi SV Clamp c H DUT v REG SLS Ci SCP 22 d Fa SEE A ID CW L il 7 c209 a LIMIT AP Black AFC 2 lu FE 470 16V R988 100 90 SS Suo Adj 10u 16V 2 VSS RE EP R222 R921 R987 100 H C D 100 ES 20 50 60HZ G r gt 100 R986 100 i Q DET x fu N203 E SN NA E Stretch smooth ii be Re gt vco R985 IK GAIN 4 4 40 C935 o M Ge i voda N201 SW ALE DL
16. AKIRA makes life better Colour TV Service Manual makes life better CHASSIS A21T01 TB1238 MODEL CT 21FGS1 makes life better 3 CONTENT m ka DESSRIELION A A Sa K ER E 4 PERINEO ai 6 e 7 FAULT FINDING TREES DIAGRAMS amp OVERVIEWS gjasa ee sigas tics pesticidas 14 VARIOUS PARAMETERS OF INTEGRATED CIRCUIT ve is 22 PEE ARI PARAS Li E aaa a ao e MANE 30 CRC e 40 Model No CT 21FGS1 Version 1 0 makes life better 4 GENERAL DESCRIPTION AKIRA AKTPOI is a CTV monolithic chassis currently developed by AKIRA Co It introduces a monolithic IC TB1238AN developed by Toshiba Co To carry out all the small signal processing TB1238AN is a kind of IC used by color TV in PAL NTSC system which is controlled by Inter IC Bus Together with the SECAM decoder TA1275Z it can form a signal processing circuit for multi system color TV This chassis 1s used in many fashionable TV receiver technologies which makes the performance reach the advanced level of the world Figure 1 shows the block diagram of ARTPOI A21T01 Table 1 provides A21T01 mainly ICs and functions Figure 2 shows the whole set power supply system for AKTP01 A21T01 Figure 3 shows the system control circuit of AKTPO1 A21T01 Table 1 A21T01 mainly ICs and functions Function Description D901 87CM38N 3GN5 Svstem control microprocessor 87CK38N 2B46 D902 AT24C08 EEPROM N101 LA7910 Band decoder N252 CD4053BE TV AV switching Model No CT 21FGS
17. AKIRA and install it in the former way 6 Never place wire near high temperature or high voltage components SAFETY CAUTIONS FOR PRODUCTS Many electric and mechanical components in AKPHO1 02 chassis have special safety performances which are always neglected Even if replacing them with some components with the same voltage and power you can not get effective protection to X ray In the circuit diagram these special electric components are indicated by the special mark A and on the shadow When replacing any of them use the one with the same specifications as the original s Otherwise it may cause X ray radiation and damage to overall safety Model No CT 21FGS1 Version 1 0 makes life better 7 CIRCUIT ADJUSTMENTS GENERAL INFORMATIONS All adjustment are thoroughly checked and corrected when the receiver leaves the factory Therefore the receiver should operate normally and produce proper color and B W pictures upon installation However several minor adjustments may be required depending on the particular location in which the receiver is operated This receiver is shipped completely in carton Carefully draw out the receiver from the carton and remove all packing materials Power cord into a convenient 220 volts 50 Hz AC two pin power outlet Turn the receiver ON Check and adjust all the customer controls such as BRIGHTNESS CONTRAST and COLOUR Controls to obtain natural color or B W picture AUTOMATIC DEGAUSSING A degauss
18. AMB YBlack 4 SRY o SECAMR YBlak 46 HAFC AFCgan 0 xi a i SI MODO Factory data 43 52 Moi Factory data JO 54 SELF TBI238ANPAQUTseleet 00 55 SELFVOC Selfadjust VCD initial data 80 56 SELFAGC_ Selfadjust AGC initial data 59 SELF TNTC Selfadjust TNTCinitial data 60 SELF COL Selfadjust COL initial data 20 NOTE The data provided in the form provides to consult only Model No CT 21FGS1 Version 1 0 28 makes life better 29 ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE products marked with a have special characteristics important to safety Before replacing any of these components read carefully the product safety notice in this service manual Don t degrade the safety of the product through improper servicing NOTE parts that not assigned part numbers are not available CA 0 25 i E Ae 0 5 pe 1 A 2 e 5 AA 10 M5 t20 Nesses 30 PIT 80 20 R279 R612 R622 R248 R219 R221 R266 RILI R201 R20 R210 R216 R218 R22 R22 R225 R226 R232 R238 R264 R265 R971 R972 R236 R404 R604 R614 R624 R106 R107 R217 R234 R244 R247 Model No CT 21FGS1 Version 1 0 makes life better 30 R272 R273 R203 R215 R205 R249 R202 R233 R246 Model No CT 21FGS1 Version 1 0 makes life better 31 Model No CT 21FGS1 Version 1 0 makes life better 32 R254 Mode
19. C Supply input RGB 9 Vertical Ramp generator capacitor connect pin Vertical pulse signal output 28 HVCC Horizontal deflection supply input HV 96 Horizontal flyback pulse input 33 DEFGND oo Ground detection circuit J 0 40 HAFC Connecting RC network for horizontal AFC filter 68 42 DIGGND Digital circuit ground 0 Model No CT 21FGS1 Version 1 0 makes life better 22 LOOP Filter Connecting RC filter network for phase loop circuit VCO GND Ground IF VCO circuit VCOVCC 49V supply input IF VCO circuit 9 FM DEC NF FM direct current negative feedback filter 3 8 capacitor can TTT 730 VCO Voltage control oscillating coil connecting pih RE Model No CT 21FGS1 Version 1 0 makes life better 23 B Pin functions of N161 AN7522N Pin ll AV o Video mode selection control No 2 17 P60 ACPOWER ACPOWERON OFE 18 19 2 R OSD R signal output G OSD G signal output O 7 POWER Power control amp Check On Hi Z input Off L outpot OSD Y signal output Y HD OSC OSD oscillator connection OSC2 OSD oscillator connection 0 I XIN IKIN 8 MHz oscillator connection 32 P66 B OSD B signal output 33 34 3 3 Y 8 9 S VIDEO Detection 40 41 42 Pin 6 zdi 8 EE EE 18 EC 28 32 EEE 34 EE 40 42 Model No CT 21FGS1 V
20. DEO1 or VIDEO2 input The picture and sound must be normal 4 AV output inspection Load a 75 Qresistor to VIDEO output terminal 1Vp p video output signal that is from TV signal or from VIDEO1 or VIDEO2 input signal should be observed on the oscilloscope Load two 10K resistors separately to AUDIO R and L output terminals two 0 7Vp p audio output signal that is from TV or from AV input signal stereo should be observed on the oscilloscope General adjustment mW AKTPOI chassis Measuring SG Equipment No 1 and No 2 service remote controller and user remote controller Preparation Brightness contrast and color should be set in standard before Adj Press PP key repeatedly to set the picture at MEMORY in standard Adjustment procedure 1 Receive the monoscope pattern signal Turn the focus adjusting VR to make the picture clear 3 Press M ON key on No 2 service remote controller to set the set into manufactory adjustment mode 4 Adjust the picture size roughly by No 2 service remote controller 5 Grid 2 voltage adjustment Press key on No 1 service remote controller to set the screen into a horizontal line Clockwise turn the screen VR gradually until a horizontal line appears on the screen 6 Press Rt or R with the red block G or G with the green block and B or B with the blue block key respectively to adjust a horizontal line appeared to the white colour 7 Press key again and changing back to norma
21. Equipment No 5 service remote controller Preparation gt before Adi Connect a digital multi meter to TP101 point on the chassis Adjustment procedure 1 Receive the color bar signal that is 87 5 modulation and 60dBu level 2 Press RF AGC key on No 5 service remote controller to select RF AGC adjustment press or key to adjust the voltage of RF AGC to 3 7 0 1V that is read on the digital multi meter Vertical height linearity and Hor position adjustment AKTPO1 chassis Measuring SG Equipment No 2 and No 3 service remote controllers i Brightness contrast and color should be set in standard before Adj Adjustment procedure 1 Receive the 5 circles pattern signal that is SOHZ vertical frequency Press V LINE V SIZE V CENT and H CENT key on NO 2 service remote controller respectively to select the vertical linearity height center position and horizontal center position adjustment and then press or key to adjust the value of them respectively according to factory s specification 3 Receive the 5 circles pattern signal that is 60HZ vertical frequency 4 Press V LINE V SIZE V CENT and H CENT key on NO 3 service remote controller separately to adjust the vertical linearity height center and horizontal center as above item 3 OSD position adjustment AKTPOI chassis m No l and No 5 service remote controller Equipment Preparation Brightness contrast and color should be set in standard before Adj
22. ersion 1 0 makes life better C Pin functions of N402 LA78040 6 R Ripple filter 8 JOUT Sound output 9 Ve2 Powersupply2 C Pin functions of N101 LA7910 JVC2 33V supply input pin 8 OUT4 Decoderoutput4 9 VCI 12V supply input pin Model No CT 21FGS1 Version 1 0 24 makes life better 25 D Pin functions of N101 LA7830 Symbol Field pulse output Pump power supply input 3 Pump power supply input SSS os Connet to phase compensate capacitance 6 Ve Power supply pi O 7 Pump power supply output D Pin functions of N251 TA1275 4 S ID FILTER The pin for connecting the SECAM identification filter capactitor 10 LI FO ADJ FILTER The pin for connecting a capacitor for automatic adjusting circuit 15 6 GND 443MHz CW IN KRAJA for input 4 43MHz of carrier wave for self adjustment ID SW The switch pin for selecting the ID detection mode SECAM ID IN OUT The interface pin to the main processor TB1238AN Model No CT 21FGS1 Version 1 0 makes life better The BUS DATA for 87CM38N 3GN5 6 CNTX SubContrastMax BB 8 o COLC Sub Color Center NTSC 40 9 TNTC Sub Tint Center 40 12 SCNT Sub Contrast 0B 14 O CNTN o Sub Contrast min 00 Sub color min o 0 30 VMI o W C Dmodedatal 00 32 VP50 o Vertical centering of 50 HZ
23. ing coil is mounted around the picture tube so that external degaussing after moving the receiver is normally unnecessary providing the receiver is properly degaussed upon installation The degaussing coil operates for about 1 second after the power to the receiver is switched ON If the set is moved or faced in a different direction the power switch must be switched off at least 30 minutes in order that the automatic degaussing circuit operates properly Should the chassis or parts of the cabinet become magnetized to cause poor color purity use an external degaussing coil Slowly move the degaussing coil around the faceplate of the picture tube the side and front of the receiver and slowly withdraw the coil to a distance of about 2m before disconnecting it from AC source If color shading still persists perform the COLOUR PURITY ADJUSTMENT and CONVERGENCE ADJUSTMENTS procedures ADJUSTMENT MODE B adjustment TV signal receiving Item AKPHOT chassis Measuning No 5 Service Remote Controller Equipment Preparation The set is turned on and work normally Before Adi No signal input Model No CT 21FGS1 Version 1 0 makes life better 8 Adjustment procedure 1 Press S PVOC key to set PIF VOC self adjusting 2 OSD appears as below after adjustment finished Self adjusting Adjusting OK Note When the OSD appears AFT NG it means that AFT adjusting is not good Please check the chassis 1f there 1s circuit short or parts wr
24. l No CT 21FGS1 Version 1 0 makes life better 33 R531 Glass Glazed Fixed RI40 1 2W 24MQ 5 RES neono em roma F10D1ROJ C RF10 1 2W 10 5 W560 W11H3R9K RXG6 5VV 3 9Q J R502 W10J3R9K RXG6 6W 3 90 J C2BF102K T C257 C2BF101K T CC1 06A RH 50 63V 100pF J C290 C2BF101K T CC1 06A RH 50 63V 100pF J C602 C2BF221K T CC1 06A RH 50 63V 220pF J C213 C2BF221K T CC1 06A RH 50 63V 220pF J Model No CT 21FGS1 Version 1 0 makes life better 34 C934 C505 C2BW102K O CT81 08C 2R 1KV 1000pF K C251 C2FF103Z T CT1 08A 2F4 50 63V 0 01uF Z C281 C2FF103Z T CT1 08A 2F4 50 63V 0 01uF Z C299 C2FF103Z T CT1 08A 2F4 50 63V 0 01uF Z C560 CoBW471K O CT81 08C 2R 1KV 470pF K C418 CaRXATIK O CT81 08C 2R 2KV 470pF K CT81 08C 2R 2KV 680pF K C241 E20C220M T Electrolytic Capacitor CD110 16V 22uF C203 E20C470M T Electrolytic Capacitor CD110 16V 47uF M Model No CT 21FGS1 Version 1 0 makes life better 35 C421 E20D4R7MN NON POLAR CD71 BP 25V 4 7uF M T Capacitor Model No CT 21FGS1 Version 1 0 makes life better 36 KE gation CBS F20J394J capacitor CBB21 200V 0 39uF 5 Pr EY F20Z822J capacitor CBB81 1 6KV 8200PF J Name o Specification C5011 Polypropylene pui o lemesmacom H linear LX40 L501 LMXX0002 Degaussing coil VD515 RX0001XX Photoelectricity PC81 at C coupler Model No CT 21FGS1 Version 1 0 makes life better 37 Model No CT 21FGS1 Version 1 0 makes life better 38 V211
25. l screen Model No CT 21FGS1 Version 1 0 makes life better 10 Measuring SG Eguipment Preparation Brightness contrast and color should be set in standard before Adj Adjustment procedure 1 Receive the cross hatch pattern signal Turn the focus adjusting VR watching the sereen and adjust the vertical line of mark to make the most thin Then the focus adj VR is set as close low voltage side as possible Stop the focus adj VR at the point that focus is a bit worse at once turn back to the left and then turn back to the right a little again po lt q To be fine H line V line Magnified drawing of part White balance adjustment Measuring SG and white balance meter Equipment No 1 service remote controller Preparation Warm up the set for more than 30 min before Adj Brightness contrast and color should be set in standard Adjustment procedure 1 Receive the monoscope pattern signal Press G G DRIVE key and B B DRIVE key on No 1 service remote controller to select G DRV and B DRV respectively then press or key to adjust the white balance at the directed value which is according to the specification of factory s adjustment 3 Press R or R G or G and B or B key respectively to adjust the white balance of low light until the white balance of high and low light is good Model No CT 21FGS1 Version 1 0 makes life better 11 RF AGC adjustment Measuring SG and digital multi meter
26. o CT 21FGSI Version 1 0 15 16 makes life better b No sound In this kind of failure first of all we should observe if there is the picture on the CRT lt proves the small signal circuit to work correctly with the picture on the CRT and we only check the sound signal processing and sound amplification circuit The repairing method B1 may be referred without picture The detail checking and repairing steps are as follow Note Before repairing assure that the volume is on and the state of set is in TV YES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 53 of N201 YES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 1 of N201 Check R231 C214 N201 NO Check N202 R231 C214 N201 YES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin4 150f N252 Check C706 C716 N252 NO Check 9V power supply YES Hear if there is the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 2 5 of N252 9V Check N203 N201 V922 R210 R202 NO The voltage on pin 16 of N252 Hear 1f there 1s the voice liking Ka Ka in the loudspeaker via using Signal input way by touching pin 2 of N701 9V YES NO Check C706 C705 R203 gt The voltage on pin 8 of N701 The voltage on pin 9 10
27. ong fitting If not counter clockwise or clockwise turn a ferrite core in T211 at 1 4 to 1 2 turn B m TV signal receiving AK TROL ehassis chassis Measuring TV SG Signal Generator Equipment Digital multi meter Preparation The set is turned on Before Adj Connect the TV SG to RF input terminal of the set Adjustment procedure gt Turn RP551 potentiometer to adjust B to specified voltage Check voltages for video out vertical out circuit work and audio power out as follow Voltage volt Tolerance Vagos js N EST ss de de ie Circuit Circuit Work KN E E 3W 19 for 3W Audio Power Out 22 for 5W 22 for SW e 3 TV signal receiving a Press MENU key to select POS MEMORY item b Press V or V key to select SEARCH or AUTOMEMORY item press Pt key to start searching c Press Pt or P key to inspect the set if there is channel skipped if so searching again by SEARCH as above described Model No CT 21FGS1 Version 1 0 makes life better 9 TV system adapting amp AV 1n output inspection Measuring SG with NTSC3 58 User remote controller Equipment Dual trace oscilloscope Preparation before Adi Input TV and AV signal Inspection procedure 1 Input the TV signal which system is designated in technical specification Switch TV system to the set by pressing SYS key on user remote controller according to the TV system in SG The picture and sound must be normal 3 Press TV AV key to select VI
28. s TK T gt La mi 47K al C445 A VDSIS S C717 T PC817B 29V 470u 16V 47u L 047u ssa C556 2KV 220 12 sa emi mam e eme jesure2on i ii C562 Ta C503 C506 I VDSSSI S0v 2 u Wvpses RTU 185V RE A IKV 1000P VD503 L503 TS01 N 1N4148 47 R445 C505 C503 TVRAN LF 11 I 1 RS61 C711 se 12 2 H FR107 041 ew 12 e e LJ US 14 S I E VD970 AE R616 De VD505 ww al cso7 R520 33 ME Ile L C630 ZN iso Ron 400V 120U Toe R525 Il ee p 1N4148 VD960 Rose 2W712K l 2200p 2kV HN LJ OHO a l R521 2W 68 is 10 R563 ra nete ZE vau B SCREEN I VDS06 N 100K ji CSS ekl R555 ni 1N4148 3 3K 200V 70 39 2592499 S lt R gt FOCUSI FTA TVRAN DE c516 L chio 160V 1000 L KU ves NR554 Ha lt A 1N4148 VDS76 R717 V444 R407 ai NT402 FBI hi US LE et CS06 CS04 VD504 N RS22 2KV 470P E NPG 1KV 470p RsseNesca4s 719 SIR Vos RICE VD973 issa esce383 IK 40 gt BDEUSe Se a gt TVRAN 15K 7 II C559 IN4148 7 de L R250 Z DERAUSSING COIL R502 VD554 250945 IN4148 U HV 6060 c o A 6w 18 4 RS24 II 35V 330u V D911 560 A cave s 3 I 12 1 7 R989 e cin Rao 500V S A I 0514 3W 39 Sg II RGP10D R560 s RSS1 100K y 1N4148 C703 RAD 1900p L sl FOCUS eeerr eer eee cso A VDS17 OLU vsi3 Il 3 3 I AR Nr994 LA 7 al 13 mal ST XS601 250VAC 0 22u beli FRIOS J RS19 2304429 ie de R557 Auvpssi T LI 18K TT ca TRANS FOCUS Axzeor a Ele rae II 13 4 7K RD6
29. s life better FAULT FINDING TREES DIAGRAMS AND OVERVIEWS 1 Three None no raster no picture no sound This failure is mainly caused by big power circuit such as power supply horizontal scanning vertical scanning The detail checking and repairing steps are as follow 0V Test the voltage of C563 50V 300V 115V Voltage of C507 Cut off W560 OV nkol i larration NO Check if V501 collect emitter 335 other n Was broken d voltage such as kekik peki 188V 24V and LOW Check R502 F501 power VES Check the voltage V551 VD551 RP551 V552 Swich AC cord and plug of V501 collector VD517 V572 V511 0V Check V501 V512 F501 R502 VD503 Per BR m Check VD556 C563 300V IV Test voltage of V501 base 115V Recover W560 unplug XZ411 for a While then 0 6V 0V Check Check if it get right T501 VD517 When cut off V572 Check V501 C515 C517 V411 Check V411 T402 T401 YES m Deflection coil C415 C416 T402 Test the voltage of C412 D901 pin7 Check L414 VD403 C411 Deflection coil test the voltage of C563 No variation VD552 VD555 4 5 5 5V CPU has sent the Power off signal Check if V572 s broken down Model No CT 21FGSI Version 1 0 115V N201 pin8 voltage 9V N201 pin32 voltage 2V V444 pin C voltage 24V Check R320 V444 Others TTI Check V411 pin C voltage 115V Check T402 V411 R449 Check R552 V551 VD551 VD515 V511 V512 R555 Others Check Z901 C901 C902 N204 OV
30. tation the failure should be in the horizontal deflection circuit We mainly check the open circuit fault in horizontal deflection circuit The detail checking and repairing steps are as follow YES The horizontal yoke is opened or not Repair CRT NO Whether XZ411 is opened Check 1f there is bad solder between XZ411 and the main board NO Check L414 VD403 C412 C415 especial in inductive components and connector YES Model No CT 21FGSI Version 1 0 makes life better 5 UOC does not work In television remote control system is similar with the computer system In theory it can work if it holds two conditions as follow The power supply n general it is 5V the error is not above 10 and the disturbance pulse is as small as possible The clock pulse In TDA93XX circuit the clock pulse is generated by pin58 pin59 of N301 and 12M crystal oscillator Television s remote control system also needs reset circuit that can preset the values in internal register The circuit around pin57 of N204 is called auto reset circuit If UOC detects errors in resetting it will come to the state of programme protected The detail checking and repairing steps are as follow D901 does not work The voltage on the pin 42 of D901 NO Observe if there is sine wave on the pin 31 or pin Check the voltage on the positive pole of L901 32 of D901 with an oscilloscope SV Check Z900 D901 Check alternant voltage on secondary coil of TSOI O
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