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ST V02-06 SERVICE MANUAL

1. KI D4 KI DS 6 KI D7 pom Y IE 1N4148 CANCEL SUBGODE INDEX STOP i option BU KI DO KI O1 KI D2 KI 03 KI D4 KI OS K1 D6 KI 07 Comp 2B en SERVICE Fu e User Remote Service Remote Remote Roadstar Keymat TTXXX409 S 45 49 MD 55 CUSL 002 028 emo 40 44 4 SC j CUSH 253 227 ene 03 07 OF 2 2 Diode 20 17 18 19 14 18 19 20 02 06 0 0 12 16 pe 01 05 09 OD 11 Pines 00 04 08 0C 10 14 Service Remote NO Code Name TV Mode Menu Mode Service Mode TXT Mode 01 00 0 0 0 VCO Fine 0 02 01 1 1 1 Service MENU 1 03 02 2 2 2 Sub brightness 2 04 03 3 3 3 3 05 04 4 4 4 4 06 05 2 5 5 5 07 06 6 6 6 6 08 07 7 7 7 7 09 08 8 8 8 8 10 09 9 9 9 Shipping 9 11 0A SUBCODE Subcode 12 OB Tens Line gain adjust LE 13 0C MENU Menu switch Run time mode choice 14 0D 15 OE REVIEW Channel review CYAN key 16 OF V PP Video PP Channel move YELLOW key 17 10 MUTE Mute unmute Mute unmute 18 11 TV TXT Enter txt Exit txt 19 12 POWER Power on off Power on off Power on off Power
2. 6 GND SVR GND GND PIN CONNECTIONS P GND P GND P GND P GND P GND P GND P GND P GND Function Digitally Controlled Audio Processor PIN CONNECTIONS MUXOUT R BING BOUT R BOUT L TREBLE L TREBLE R pm 9 STV2248 PIN13 STV2248PINI8 STV2248 PIN32 5 2248 PIN31 STV2248 PIN30 95Vpp 95Vpp 95 7Vpp Hl H STV2248 PIN48 STV2248 PIN49 1000Vpp 23Vpp H STV2248 PIN47 HEATER 10 IC Voltages ST92195 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Voltage 5 0 50 0 1 5 0 0 2 49 0 1 10 0 0 1 01 0 1 041 0 1 10 1 0 5 0 5 0 5 01 3 2 Pin 20 21 22 23 24 25 26 7 28 29 31 32 33 34 35 36 37 38 Voltage 3 6 5 0 0 1 0 1 0 0 5 0 5 0 1 7 5 0 2 1 04 5 0 49 0 1 13 00 0 0 0 0 2 0 Pin 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 ss 56 Voltage 5 0 0 8 0 8 5 0 5 0 0 1 0 1 01 5 0 0 1 15 0 2 4 2 3 0 1 0 1
3. 7V Menu 2 8 32 No use 3 3 3 7VY AV 3 8 4 2VY POWER a Y
4. and AGC Adjustment Using Item up P Item down P keys and the selected item value is modified using Value V Value V keys The parameters controlled in the picture menu are a HP50 Horizontal position for 50 Hz signal b VP50 Vertical position for 50 Hz signal c VAP50 Vertical amplitude for 50 Hz signal d HP60 Horizontal position for 60 Hz signal e VP60 Vertical position for 60 Hz signal f VAP60 Vertical amplitude for 60 Hz signal g VZM Vertical amplitude for zoom h VWD Vertical amplitude for wide j CNTX Contrast maximum k COLC Colour center 1 STINT Bub tint m TAGC Tuner AGC 3 Service2 adjustment When in Service 1 menu if the MENU SW Digit 1 key is pressed Service 2 menu appears and the display is as follows VS50 VS60 VSH VSC VCC EW VC EWAP EWSP EWTP no use a BGC Bit7 No use Bit6 4 these three bits are used to set the color of title string of menu Bit3 0 these four bits are used to set the background color of menu b FGC Bit7 No use Bit6 4 these three bits are used to set the color of title string of menu Bit3 0 these four bits are used to set the background color of menu c BAC Bit7 No use B6 4 these three bits are used to set the character color of adjusting bar B3 0 these four bits are used to set the background color of adjusting bar d CUSL Custom code low bit set e CUSH Custom code high bit set g MOD Bit7 SERVICE_CUSTOM_CODE 0
5. nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety characteristics are identified in the parts list of Service manual Electrical components having such features are identified by shading on the schematics and by nd replacement which does not have the same safety characteristics on the parts list in Service manual The use of a substitute as the recommended replacement part shown in the parts list of Service manual may cause shock fire or other hazards Don t short between the LIVE side ground and ISOLATED NEUTRAL side ground or EARTH side ground when repairing Some model s power circuit is partly different in the GND The difference of the GND is shown by the LIVE 7 7 side GND ISOLATED NEUTRAL L side GND and EARTH side GND Don t short between the LIVE side GND and ISOLATED NEUTRAL side GND or EARTH side GND and never measure with a measuring apparatus oscilloscope etc the LIVE side GND and ISOLATED NEUTRAL side GND or EARTH side GND at the same time If above note will not be kept a fuse or any parts will be broken If any repair has been made to the chassis it is recommended that the B1 setting should be checked or adjusted See ADJUSTMENT OF B1 POWER SUPPLY The high voltage applied to the picture tube must conform with that specified in Service manual Excessive hi
6. 0 3 6 3 2 AC supply 176 260V 50 60Hz 11 Other 1 binary digit change to algorism binary digit algorism 2 Bit2 4 Bit3 8 Bit4 16 32 Bit6 64 Bit7 128 OPTION2 Bit7 Bit6 Bit5 Bit4 Bi2 Bitl Note binary digit 0 0 1 1 0 0 0 0 0 use algorism 128 64 32 16 8 4 2 1 1 Use binary digit 00110000 algorism 32 16 48 2 Some skills of factory adjustment a How to enter service mode Firstly pressing the INDEX key then secondly pressing the SERVICE key Press SERVICE key again to exit service mode b How to use user remote enter Service mode Press MENU 6 4 8 3 key within 6s c How to unlock TV set if you forgot password Press gt QV 1 7 key within 6s d How to bus off Press SLEEP key after entering service mode e How to adjustment VCO Press TV AV key while the VCO item is selected at service mod f How to realize VCO fine auto adjust Press DIGITAL 0 key while the VCO fine item is selected at service mode g How to set vertical scan disable Press key at white balance mode Note the custom code of service remote controller is CUSL 8E CUSH 71 3 Keyboard input Key In Key Pressed 0 3 0 7 Volume 0 8 1 2V Volume 1 3 1 7V Program 1 8 2 2V Program 2 3 2
7. 0 1 3 1 5 1 STV2248 Pin 1 2 3 4 5 6 7 8 9 10 11 112 13 14 15 16 17 18 19 Voltage 2 5 2 26 3 2 2 7 25 25 18 2 0 0 0 39 5 0 2 9 24 40 3 9 79 3 2 0 0 Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Voltage 2 8 26 28 1 7 1 7 2 5 1 7 2 5 0 0 40 1 7 1 7 1 7 3 7 44 44 43 0 0 0 1 Pin 39 40 41 42 44 45 46 47 48 49 50 51 52 53 54 55 56 Voltage 1 0 1 7 2 4 28 0 0 3 2 7 1 56 4 1 32 0 6 41 3 6 32 5 0 0 0 38 1 2 TDA8174A Pin 1 2 3 4 5 6 7 8 9 10 11 Voltage 13 3 26 9 3 9 6 7 45 0 0 7 5 83 45 26 8 1 5 TDA7267 Pin 1 2 3 4 5 6 7 8 Voltage 14 9 7 6 8 1 0 9 0 0 0 0 0 0 0 0 STV7267A Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Voltage 14 9 7 6 8 1 0 9 0 1 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TDA7449 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Voltage 4 0 7 9 0 0 3 3 3 3 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 4 0 0
8. 1 Y 10 HGREEN 11 HYELLOW 12 HBLUE 13 14 HCYAN 15 GRAY mute while adjusting vertical one line B5 4 These two bits are used to set the sound system while shipping 00 01 DK 10 I 11 LU B3 0 These four bits are used to set the brightness of st2248 while adjusting vertical one line and bit6 of BVLP is zero 4 Service3 adjustment When in Service 2 menu if the MENU SW Digit 1 key is pressed Service 3 menu appears and the display is as follows gain 00 03 b OPT1 Bit7 6 Thermal resistance delay time control 00 45 01 65 10 85 11 10s Bit5 P N S crystals application 0 2 crystals P S N application 1 1 crystal P N S 4 43MHz application Bit4 Cutoff loop 0 0FF 1 ON be used to set the bit6 of register OxOc Of stv2248 Bit3 Safty_Reset O active non Bit2 Power on keep standby 0 Last power memory function 1 Standby state after power on Bit1 PIF overmodulation O OFF 1 ON Bit0 LOGO display O OFF 1 ON c OPT2 Bit7 Market_france SECAM LL O OFF 1 ON Bit6 Manual Auto cutoff 0 Manual 1 Auto Bit5 ENG LOG RUS FARSI 0 the characters of LOGO and LABEL will changed automatically while Russian language is selected 1 the English characters of LOGO and LABEL will not changed automatically while Russian language is selected Bit4 COLOR 6dB 0 0FF 1 0N APR Feature 0 0N 1 0FF Bit2 Black Stretch O ON 1 OFF Auto Flesh O ON 1 OFF Bit0 RGB OS
9. ALUE NOTE 1 VS50 saw50 00 No Use 2 VS60 saw60 00 No Use 3 VSH sh 50 and 60 24 No Use 4 VSC V sc 05 No Use 5 VCC Vcc 07 No Use 6 EWVC EW vdc 31 No Use 7 EWAP EW amp 00 No Use 8 EWSP EW shape 29 No Use 9 EWTP EW trap 22 No Use 10 BGC Background color 111 11 FGC Foreground color 113 12 BAC Bar color 111 13 CUSL Custom code low byte 002 028 Roadstar 002 Keymat 028 14 CUSH Custom code high byte 253 227 Roadstar 253 Keymat 227 15 MOD Option of the software 058 TACT SWITCH 6 058 TACT SWITCH 5 059 16 BVLP Option of the software 192 SERVICE 3 SR NO PARAMETERS Description VALUE 1 AGCG AGC gain 00 2 OPTI Option 1 64 3 OPT2 Option 2 48 SECAM LL no use 48 SECAM LL use 176 4 OPT3 Option 3 144 145 MONO 144 STEREO 145 5 OPT4 Option 4 255 AV USE 255 AV1 NO USE 254 6 5 Option 5 00 7 ST Ttext 00 8 VPL Voltage protect level for 187 XRAY 9 INGN Input gain for tda7449 00 10 SVC Smart volume control 159 for stv8216 11 HPOSD HPOS OSD 001 12 VPOSD VPOS OSD 10 13 HPTXT HPOS TXT 50 14 VPTXT VPOS TXT 15 15 MISC Option for functions 111 8 ICs Functional Description TDA8174A Function Vertical Output PIN PIN CONNECTIONS 1 Power Out Ramp Generator 2 Output Stage Vs 8 Buffer Output 3 Trigger Input 9 Inverting Input 3 Supply Voltage 5 Flyback Generator 6 PIN CONNECTIONS GND OUT
10. D CONTRAST 0 contrast control disable contrast control enable Bit7 Sound demodulation 0 intercarrier 1 055 Bit6 Smart volume control 0 no use 1 use Bit5 Woofer O no use 1 use AVL O OFF 1 ON Nicam Module of STV8216 0 no use 1 use Bit2 Pin49 Volume PWM 0 no use 1 use Bit1 STV8216 0 no use 1 use Bit0 TDA7449 0 no use 1 use e OPT4 Bit7 AV_VID_OPTION 0 AV 1 AV2 RGB DVD AV3 S AV3 each AV channel is optional 1 AV1 SCART AV SCART RGB SCART SVHS this option is for VIDEOCON B6it TVAV_AUDIO_OUT 0 the output of pin11 is always AM FM demodulator output 1 the output of pin11 is Main audio switch output Bit5 TVAV VIDEO OUT 0 5 2 is always CVBSINI 1 According to AVI AV2 RGB AV3 CVBSOUT 2 is CVBS1 CVBS2 Y CVBS3 or Y C Bit4 SVHS_SET 0 only 1 SVHS auto detect Bit3 AV3 SVHS SCART SVHS for VID 0 OFF 1 ON Bit2 RGB DVD SCART RGB FOR VID 0 OFF 1 ON Bit1 AV2 SCART AV FOR VID 0 OFF 1 ON Bit0 AV1 0 1 5 BitO enable the remote controller to change Time Mode Choice Bit2 Time Mode Choice The Run Time Mode Choice selects the user table for teletext languages For more details please refer to the teletext software Sttext user guide and the Font management documentation Our standard OSD font is designed for European market Other language are also available Russian Ukranian Arab
11. G Sub Green i BMAX Brightness maximum BMIN Brightness minimum k ATHD APR_threshold 00 15 1 LOGO the first shoe the length of logo and the followed is the logo Press key to set the screen into a horizontal line Press the key again to return to the normal picture 2 Servicel adjustment When in White Balance menu If the MENU SW Digit 1 key is pressed Service 1 menu appears and the display is as follows Servicel f 38 9MHz 50 50 VAPS0 HP60 VP60 TUNER VCO Status For the VCO adjustment Feed a 38 9MHz carrier as IF input Press the Item up P Item down P keys to move the cursor to the item and press the Auto adjust VCO TV AV key will automatically adjust VCO Coarse and VCO Fine to get VCO OK Status The VCO status bar at the bottom of the screen appears only if either VCO Coarse item or VCO Fine item is selected The VCO status is read from the Read register of STV 2248 and guides whether to Increase Decrease the VCO registers to attain VCO OK Status SECAM L L VCO Adjustment Firstly adjustment VCOC to Secondly input f 233 9MHz SECAM LL signal from tuner IF pin and set the TV set system to SECAM LL and move the cursor to VCOCLI then press TV AV key to Note VCOCLI and VCOFLI is SECAM LL France System use Some model without SECAM LL System Picture
12. R_SET2 0 unuse 1 use L 49 75 144 25M 152 25 424 25H 432 25 863 25 38 0 2 Bit3 FS_TUNER_SET1 0 unuse 1 use L 48 25 140 25M 147 25 423 25H 431 75 863 25 PIF 38 9Mhz if FS_TUNER_SET2 and FS_TUNER_SET lare both zero then L 48 25 147 25M 154 25 423 25H 431 75 855 25 PIF 38 9Mhz Bit2 FS tuner port set O p2 1 p3 Bitl FS 380 389 0 PIF38 0 1 PIF38 9 Bit0 VS FS 02 VS 1 FS 11 7 Service and Design Data SERVICE white balance SR NO PARAMETERS Description VALUE NOTE 1 RCUT Red cut off 49 2 GCUT Green cut off 68 3 BCUT Blue cut off 60 4 RDRV Red drive 32 5 GDRV Green drive 32 6 BDRV Blue drive 32 7 SUBR Sub Red 32 8 SUBG Sub Green 32 9 BMAX Brightness maximum 57 10 BMIN Brightness minimum 10 11 ATHD APR_threshold 15 12 LOGO LOGO set 00 SERVICE 1 SR PARAMETERS Description VALUE NOTE 1 50 Hpos 50Hz 37 2 50 Vpos 50Hz 08 3 50 size 50Hz 26 4 HP60 Hpos 60Hz 31 5 VA60 Vpos 60Hz 15 6 VAP60 V size 60Hz 35 7 VZM V zoom size 35 8 VWD V wide size 12 9 CNTX Contrast maximum 63 10 COLC Colour center 32 11 STINT Bub tint 32 12 TAGC Tuner AGC 42 SECAM LL TAGC 28 13 VCOC VCO coarse 06 14 VCOF VCO fine 58 15 VCOCLI VCO coarse L1 09 16 VCOFLI VCO fine L1 56 SERVICE 2 SR NO PARAMETERS Description V
13. ST V02 06 COLOUR TELEVISION SERVICE MANUAL CONTENTS 1 2 10 11 Safety Precautlons Asger er AAA AAA AA 3 MCU and signal Processor for a PAL NTSC SECAM 4 De tintiotof5 PIN ren ARA AAA AE AAA 5 Definition or SCV 2248 Pin A A AAA 6 Remote Control Circuit Diagram and Function pp 7 Service Controlled Pun com a Erler 8 Device ee 8 8 A A 9 4 SCLVICES adjusttment nike 10 Service and Design Data qs A N 12 ICs Functional 13 Test Point Waveforms A AAA AA 14 IC Vota T 14 15 1 SAFETY PRECAUTIONS 1 The design of this product contains special hardware many circuits and components specially for safety purposes For continued protection no changes should be made to the original design unless authorized in writing by the manufacturer Replacement parts must be identical to those used in the original circuits Service should be performed by qualified personnel only Alterations of the design or circuitry of the products should not be made Any design alterations or additions will void the manufacturer s warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom Many electrical and mechanical parts in the products have special safety related characteristics These characteristics are often not evident from visual inspection
14. eflection system output circuit TDA7267 Audio Output SC6122 Remote Controlled Transmitter AUDIO POWER AMP TDA7267 SPEKER I C BUS LINE PIF SIF V C D 12248 RECEIVER AMP REMOTE CONTROL 2216 SCART AV INPUT RGB INPUT AV SVHS INPUT VERT DUT TDA8174A 26V 8 5V 147 POWER SUPPLY ST V028 V06 Mono System Block AUDIO an POWER AMP LEFT AUDIO TDA7267A SPEKER PROCESSOR TDA7449 AUDIO ICT POWER AMP TDA7267A SPEKER BUS LINE MICRO COMPUTER ST92195 C7B1 PIF SIF V C D 512048 RECEIVER AMP cx 7 REMOTE CONTROL 2216 SCART INPUT RGB INPUT AV OUTPUT VERT DUT SVHS INPUT TDA8174A 26V 8V 5V 14 ST vV02 V06 Stereo System Block 3 Definition of ST92195 Pin Pin Name Port VO Pin No PinNo VO Port Pin Name IRIN P2 0 I 1 56 I P2 1 KBINPUT AIN1 RESET RESET I 2 55 I P2 2 XRAY2 AIN2 Thermal resistance control PO 7 O 3 54 O P2 3 VT Sound MUTE 0 6 O 4 53 O P2 4 AV1 AV2 AV3 NC P0 5 VO 5 52 O P2 5 AV1 AV2 POWER ON OFF P0 4 O 6 51 XTAL XTAL NC P0 3 I 7 S 50 XTAL XTAL SCART I P0 2 I 8 T 49 Volume PWM output NC 1 I 9 9 48 O 4 6 TV AV sw
15. gh voltage can cause an increase in X Ray emission arcing and possible component damage therefore operation under excessive high voltage conditions should be kept to a minimum or should be prevented If severe arcing occurs remove the AC power immediately and determine the cause by visual inspection incorrect installation cracked or melted high voltage harness poor soldering etc To maintain the proper minimum level of soft X Ray emission components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product Do not check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kQ 2W resitor to the anode button When service is required observe the original lead dress Extra precaution should be given to assure correct lead dress in the high voltage circuit area Where a short circuit has occurred those components that indicate evidence of overheating should be replaced Always use the 10 11 1 Q manufacturer s replacement components Isolation Check Safety for Electrical Shock Hazard After re assembling the product always perform an isolation check on the exposed metal parts of the cabinet antenna terminals video audi
16. ic Persian Greek Hebrew ST Westeurope MCU sixteen kinds of language ENGLISH FRENCH SWEDISH TURKISH GERMAN PORTUGUESE SPANISH ITALIAN FARSI POLISH RUSSIAN RUMANIAN SERBIAN CZECH ESTONIA 10 NEDERLAND 0 ENGLISH FRENCH SWEDISH TURKISH GERMAN PORTUGUESE SPANISH ITALIAN FARSI 1 ENGLISH FRENCH SWEDISH CZECH GERMAN NEDERLAND SERBIAN ITALIAN FARSI 2 POLISH FRENCH SWEDISH CZECH GERMAN NEDERLAND SERBIAN ITALIAN RUMANIAN 3 POLISH RUSSIAN ESTONIAN TURKISH GERMAN NEDERLAND PORTUGUESE SPANISH ITALIAN FARSI g STTT only for ST engineer Bit0 enable Stto change the process for adjusting Autogain Bit2 Bit3 select the correct process ROM_M6_P_valid OSDEPROM M6 R valid ROM M6 P valid EPROM_M6_R_ valid EPROM 6 R valid ROMLESS H5 P valid ROM H5 P valid EPROM M6 valid note ROMLESS M6 M6 valid h VPL Voltage protect level for XRAY 0 255 i INGN Input gain for TDA7449 j SVC Smart volume control for STV8216 k HPOSD Horizontal position for OSD 1 VPOSD Vertical position for OSD m HPTXT Horizontal position for teletext n VPTXT Vertical position for teletext MICS Bit7 FORCED_MONO_OPTION 0 for forced mono status st8216 will demodulate the input signal 1 for forced mono status st2248 will demodulate the input signal Bit6 Coring 0 no use use XRAY_SET 0 use use Bit4 FS_TUNE
17. itch P0 0 O 10 2 47 I 4 5 NC P3 7 I 11 1 46 O P4 4 SAW SW2 BUS OFF CON P3 6 I 12 9 45 I 4 3 NC P3 5 I 13 5 44 P4 2 SAW SWI SCART 2 P3 4 I 14 43 O P4 1 BAND II B B 15 42 O P4 0 BAND I G G I 16 41 VSYNC SYNC R R O 17 40 HSYNC HSYNC BLANK BLANK 18 39 AVDDI AVDDI SDA P5 1 IO 19 38 PXFM PXFM SCL P5 0 20 37 JTRSTO JTRSTO VDD VDD 21 36 GND GND JTDO JTDO 22 35 AGND AGND WSCF WSCF 23 34 I CVBSI CVBSI WSCR WSCR 24 33 I CVBS2 CVBS2 AVD3 AVDD3 25 32 JTMS JTMS TESTO TESTO 26 31 AVDD2 AVDD2 MCFM MCFM 27 30 CVBSO CVBSO JTCK JTCK 28 29 TXCF TXCF Up to 96 Kbytes ROM 256 or 512 bytes RAM 256 bytes Register File 16 bit cru MU Interrupt Management ST9 CORE Up to 8 Kbytes RY BUS MEM I nd NZLLLO IN OSCIN OSCOUT RESET CA RESETO RCCU 16 BIT TIMER WATCHDOG NT a TIMING AND CLOCKCTRLK 2 VOLTAGE SYNTHESIS SDOISDI SCK MCFM STANDARD TIMER KO STOUTO DATISCLT A2ISCL GEA REGISTER BUS porto K_E_ gt Po z 0 a ecl 2 GA Porra gt p3 7 4 VO KA KE gt 0 10 PORT 5 oT DATA SLICER amp ACQUI 4 SITION UNIT SYNC TXCF CVBS1 EXTRAC TION VPSN wer sucer 19 CVBS2 AIN 4 EN SYNC Cota Cone ICSYNC SCREEN MULTP DISPLAY RGIBFB isu
18. k Method Plug the AC line cord directly into the AC outlet do not use a line isolation transformer during this check Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner Connect a 15000 10W resistor paralleled by a 0 15uF AC type capacitor between an exposed metal part and known good earth ground water pipe etc Measure the AC voltage across the resistor with the AC voltmeter Move the resistor connection to each exposed metal part particularly any exposed metal part having a return path to the chassis and measure the AC voltage across the resistor Now reverse the plug in the AC outlet and repeat each measurement Any voltage measured must not exceed 0 75V AC r m s This corresponds to 0 5mA AC r m s However in tropical area this must not exceed 0 3V AC r m s This corresponds to 0 2mA AC r m s AC VOLTMETER HAVING 400007 OR MORE SENSITIVITY PLACE THIS PROBE ON EACH EXPOSED 18000 10W METAL PART GOOD EARTH GROUND 2 MCU and signal Processor for a PAL NTSC SECAM TV The ST92195 C7B1 is a MCU with on screen display and Teletext data silcer The STV2248 is an Bus controller multistandard signal and chip TV pressor ST V02 V06 color TV block diagram ST92195 MCU OSD TXT controller with Software inside 24C16 Non Volatile memory EEPROM STV2248 Bus Controlled Mulit standard TV Processor TDA7449 Bus Controlled Audio processor TDA8174A Vertical d
19. o input and output terminals Control knobs metal cabinet screwheads earphone jack control shafts etc to be sure the product is safe to operate without danger of electrical shock The surface of the TV screen is coated with a thin film which can easily be damaged Be very careful with it when handle the TV Should the TV screen become soiled wipe it with a soft dry cloth Never rub it forcefully Never use any cleaner or detergent on it Dielectric Strength Test The isolation between the AC primary circuit and all metal parts exposed to the user particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC r m s for a period of one second Withstand a voltage of 1100V AC r m s to an appliance rated up to 120V and 3000V AC r m s to an appliance rated 200V or more for a periode of one second This method of test requires a test equipment not generally found in the service trade Leakage Current Check Plug the AC line cord directly into the AC outlet do not use a line isolation transformer during this check Using a Leakage Current Tester measure the leakage current from each exposed metal part of the cabinet particularly any exposed metal part having a return path to the chassis to a known good earth ground water pipe etc Any leakage current must not exceed 0 5mA AC r m s However in tropical area this must not exceed 0 2mA AC r m s e Alternate Chec
20. on off 20 14 TV AV Source changed Channel delete Auto adjust VCO 21 16 STATUS Status Recall RED key 22 1A V Volume Increase value Value 23 1B P Channel Menu item up Item up Page plus 24 1 V Volume Decrease value Value 25 IF P Channel Menu item down Item down Page minus 26 40 Service Service in Service exit 27 44 INDEX Index 28 45 SLEEP Sleep BUS OFF GREEN key 29 49 MIX Mix 30 4C SIZE ZOOM Screen zoom wide Size 31 4D STOP Stop 32 55 CANCEL Cancel 33 5B REVEAL Reveal 34 5C A PP Audio PP 6 Service Controlled Function The Service mode is entered by firstly pressing the INDEX key then secondly pressing the SERVICE key when the TV is in ON condition M is displayed on the screen Once in service mode MENU SW Digit 1 key displays successively the white balance ment and 3service menus Press the Service In key again to exit Service mode Note How to use user remote enter Service mode Press MENU 6 4 8 3 key 1 Service RGB adjustment The items within the White Balance mode can be accessed using Item up P Item down P keys and the selected item value is modified using Value V Value V keys The parameters controlled in the White Balance menu are a RCUT Red cut off b GCUT Green cut off RCUT 63 M c BCUT Blue cut off d RDRV Red drive e GDRV Green drive f BDRV Blue drive g SUBR Sub Red h SUB
21. the custom code of 8E 71 is always accepted 1 the custom code of 8E 71e is not always accepted Bit6 KEY_MUTE_OPT the output of pin41 is high while mute status 1 the output of pin41 is low while mute status POS SPEAKER MUTE 0 the output of pin41 is high while changing pos or 1 the output of pin41 is low while changing pos or TV AV Bit4 VOL SLOW DOWN MUTE O0 directly set the mute register of ST2248 to mute status and mute pin of ST92195 to be high 1 firstly reduce the volume Brightness to zero then set the mute register of ST2248 to mute status and mute pin of ST92195 to be high Contrast Bitit3 NO SIGNAL OPTION 0 the software will check the status of both Color bit2 bit3 of the only read register 0x00 of 512248 whether there is valid Sharpness FGC bit6 4 signal not 1 the software will only check the status of bit3 of the only read register 0x00 of st2248 whether there is valid signal or not Bit2 ONLY_UHF_OPTION 0 three band 1 only UHF band FAC VID OPTION 0 disable factory automation of VID mode 1 enable factory automation of VID mode POS VID OPTION P P can not enter AV 1 P P CAN enter AV h BVLP BAC bit6 4 BAC bit3 0 Colour option O black l ired 2 green 3 yellow 4 blue 5 magenta 6 cyan 7 white 9 no video signal 1 8 HBLACK highlight black 9 HRED B6 MUTE 0 no Y mute while adjusting vertical one line
22. viele D A PWMITO VERTER All alternate functions characters are mapped on Ports 0 2 3 4 and 5 Note 1 One standard timer ST92195C devices two standard timers on 517921950 devices Note 2 PC available on 57921950 devices only In f STV2248 P ion O t ini 4 Def WHLNOD 20 dOO1Puz d007 181 TELNOZIM OH TwLNOZIMOH 25 TWOELLH3 A 1noa 1no9 ino ONDIN 1H 590415 4vsnoa LHS 0508 INO2O 1VS BEN E un X1VAMP CHROUT a VI OHHO ueste der WdoOlvindadomad ISINMYWIISTIWA YITNA ONINNL IN OLY gt 55 41 8 aHI019 Qvo TH3 O 22 22 343114 YINOHHI ONIMCO OND Wad cvBsouT2 NTBC CVBSOUT1 amp CVBSIN1 AM FMOUT SC Subcarrier EXTAUDIOIN ann INTCVBSOUT AUDIOOUT MALY JANI Lods YM 43005930 sna Il ET up 9931999 zNIdld 5 Remote Control Circuit Diagram and Function vb 5 474 200pF 200pF 455KHZ ds Service MENU Sub Br P 1 10 8 7 1 NEP d osci osco VDD REM pS Es Shi CeO Im A d 2 sa A pu 6122 sO 0 STATUS SLEEP REVIEW VPP es 22 En BUS OFF APP m REVERE SEE

ST V02-06 SERVICE MANUAL

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