KEYMAT Ch. ST-V02_06 ST92195 (N903).pdf part of KEYMAT KEYMAT Ch. ST-V02_06 ST92195 (N903).pdf, Service Manual text manual preview

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ST V02/06
COLOUR TELEVISION SERVICE MANUAL

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CONTENTS
1. Safety Precautions............................................................................................. 3 2. MCU and signal Processor for a PAL/NTSC/SECAM TV................................................ 4 3. Definition of ST92195 Pin.................................................................................... 5 4. Definition of STV2248 Pin.................................................................................... 6 5. Remote Control Circuit Diagram and Function............................................................ 7 6. Service Controlled Function.................................................................................... 8 1)Service RGB adjustment.................................................................................... 8 2)Service1 adjustment.......................................................................................... 8 3)Service2 adjustment.......................................................................................... 9 4)Service3 adjustment.......................................................................................... 10 7. Service and Design Data....................................................................................... 12 8. ICs Functional Description.................................................................................... 13 9. Test Point Waveforms.......................................................................................... 14 10. IC Voltages...................................................................................................... 14 11. Other......................................................................................................... 15

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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 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 ( ) on the parts list in Service manual. The use of a substitute replacement which does not have the same safety characteristics 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: ( ) side GND, ISOLATED (NEUTRAL) : ( ) 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 high 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 10k 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 9. manufacturer's replacement components. 10. 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/audio 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. 11. 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. (1) 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. (2) 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.). Alternate Check 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 1500 10W resistor paralleled by a 0.15�F AC-type capacitor between an exposed metal part and a 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.)

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8.

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2.MCU and signal Processor for a PAL/NTSC/SECAM TV
ST92195 24C16 STV2248 TDA7449 TDA7267 SC6122

The ST92195-C7B1 is a MCU with on-screen display and Teletext data silcer. The STV2248 is an I2C Bus-controller multistandard signal and chip TV pressor. ST V02/V06 color TV block diagram MCU+OSD+TXT controller with Software inside. Non Volatile memory(EEPROM) Bus Controlled Mulit-standard TV Processor. Bus Controlled Audio processor.

TDA8174A Vertical deflection system output circuit. Audio Output Remote Controlled Transmitter.

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3. Definition of ST92195 Pin
Pin Name IR IN RESET Thermal resistance control Sound-MUTE NC POWER ON/OFF NC SCART-1 NC TV/AV switch NC BUS OFF CON NC SCART-2 B G R BLANK SDA SCL VDD JTDO WSCF WSCR AVD3 TEST0 MCFM JTCK Port P2.0 RESET P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 P3.7 P3.6 P3.5 P3.4 B G R BLANK P5.1 P5.0 VDD JTDO WSCF WSCR AVDD3 TEST0 MCFM JTCK I/O I I O O I/O O I I I O I I I I O I O I/O O Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Pin No. 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 I/O I I O O O Port P2.1 P2.2 P2.3 P2.4 P2.5 XTAL XTAL P4.7 P4.6 P4.5 P4.4 P4.3 P4.2 P4.1 P4.0 VSYNC HSYNC AVDD1 PXFM JTRST0 GND AGND CVBS1 CVBS2 JTMS AVDD2 CVBS0 TXCF Pin Name KBINPUT(AIN1) XRAY2(AIN2) VT AV1/AV2/AV3 AV1/AV2 XTAL XTAL Volume PWM output

S T 9 2 1 9 5

O O I O I O O O

SAW-SW2 SAW-SW1 BAND II BAND I SYNC HSYNC AVDD1 PXFM JTRSTO GND AGND CVBS1 CVBS2 JTMS AVDD2 CVBS0 TXCF

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4. Definition of STV2248 Pin

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5. Remote Control Circuit Diagram and Function

OPTION 5B 45 49 4D 4C 44 55
Remote CUSL CUSH Diode User Remote Roadstar Keymat 002 028 253 227 Pin20 Pin17,18,19 Service Remote TTXXX409-S ----Pin14,18,19,20

40

5C 03 07 0B 0F 1B 1F 02 06 0A 0E 12 16 1A 1E 01 05 09 0D 11 00 04 08 0C 10 14

Service Remote NO.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Code
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 14 16 1A 1B 1E 1F 40 44 45 49 4C 4D

Name
0 1 2 3 4 5 6 7 8 9 SUBCODE -/-MENU I/II REVIEW V-PP MUTE TV/TXT POWER TV/AV STATUS V+ P+ VPService INDEX SLEEP MIX SIZE / ZOOM STOP

TV Mode
0 1 2 3 4 5 6 7 8 9 Tens Menu switch NICAM Channel review Video PP Mute/unmute Enter txt Power on/off -Source changed Status Recall Volume + Channel + Volume Channel Service in Sleep Screen zoom/wide

Menu Mode
0 1 2 3 4 5 6 7 8 9

Service Mode
VCO Fine Service MENU Sub brightness

TXT Mode
0 1 2 3 4 5 6 7 8 9 Subcode ) Run_time_mode_choice CYAN key YELLOW key Exit txt Power on/off RED key

Shipping Line gain adjust(

Channel move Mute/unmute Power on/off Channel delete Increase value Menu item up Decrease value Menu item down Power on/off Auto adjust VCO Value + Item up Value Item down Service exit BUS OFF

Page plus Page minus Index GREEN key Mix Size Stop 7

32 33 34

55 5B 5C

CANCEL REVEAL A-PP

Cancel Reveal 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)SUBG: Sub Green i)BMAX: Brightness maximum. j)BMIN: Brightness minimum k)ATHD(APR_threshold 00 15) l)LOGO(the first shoe the length of logo, and the followed is the logo) Press the Press the (-/--) key to set the screen into a horizontal line. (-/--) key again to return to the normal picture.

(2)Service1 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:

Service1
HP50 VP50 VAP50 HP60 VP60 VAP60 VZM VWD CNTX COLC STINT TAGC VCOC VCOF VCOCL1 VCOFL1 VCO Status 35 09 29 32 13 39 36 13 63 32 00 47 08 056 09 056 OK

M f=38.9MHz
IF

TUNER

C=0.1uF

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 VCOC 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.
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* SECAM L/L' VCO Adjustment
Firstly adjustment "VCOC" to "OK". Secondly input f =33.9MHz SECAM LL' signal from tuner IF pin and set the TV set system to SECAM-LL' and move the cursor to "VCOCL1" then press "TV/AV" key to "OK". Note:VCOCL1 and VCOFL1 is SECAM LL' France System use. Some model without SECAM LL' System.

Picture 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. l) 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,EWVC,EWAP,EWSP and EWTP no use. a)BGC M Service 2 Bit7:No use VS50 00 Bit6-4:these three bits are used to set the color of title string of menu VS60 36 Bit3-0: these four bits are used to set the background color of menu VSH 24 b)FGC VSC 05 Bit7:No use VCC 07 Bit6-4:these three bits are used to set the color of title string of menu EWVC 31 Bit3-0: these four bits are used to set the background color of menu EWAP 00 c)BAC EWSP 29 Bit7:No use EWTP 22 B6~4:these three bits are used to set the character color of adjusting bar BGC 111 B3~0:these four bits are used to set the background color of adjusting bar FGC 113 d)CUSL BAC 111 Custom code low bit set CUSL 002 e)CUSH CUSH 253 Custom code high bit set MOD 050 g)MOD BVLP 192 Bit7: SERVICE_CUSTOM_CODE (0: the custom code of 8E/71 is always accepted 1: the custom code of 8E/71e is not always accepted) Bit6: KEY_MUTE_OPT (0: the output of pin41 is high while mute status, 1: BGC bit6-4 BGC bit3-0 FGC bit3-0 the output of pin41 is low while mute status) Bit5: POS_SPEAKER_MUTE (0: the output of pin41 is high while changing pos or TV/AV, 1: the output of pin41 is low while changing pos or TV/AV) Picture Bit4: VOL_SLOW_DOWN_MUTE(0: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 Contrast ST92195 to be high) Color Bitit3:NO_SIGNAL_OPTION (0: the software will check the status of both FGC bit6-4 bit2 and bit3 of the only read register 0x00 of st2248 whether there is valid Sharpness signal or 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) 32 Bit2: ONLY_UHF_OPTION (0= three band,1= only UHF band) Bit1: FAC_VID_OPTION (0:disable factory automation of VID mode, 1: enable factory automation of VID mode) Bit0: POS_VID_OPTION (0: P+/P- can not enter AV, 1: P+/P- CAN enter AV ) h)BVLP BAC bit6-4 BAC bit3-0 B7:TDA7449_AVMUTE_OPT(0: no use ,1: Audio output of AV is mute while Colour option: no video signal) B6VRGB_MUTE_OPT (0:no Y mute while adjusting vertical one line, 1: Y 0:black 1:red 2:green 3:yellow 4:blue 5: magenta 6:cyan 7:white 9 8:HBLACK(highlight black) 9:HRED 10:HGREEN 11:HYELLOW 12:HBLUE 13:HMAGENTA 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: BG, 01: DK, 10: I, 11: LL') B3~0These 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: a)AGC M AGC gain(00-03) Service 3 b)OPT1 00 AGCG Bit7~6:Thermal resistance delay time control 00:4s 01:6s 10:8s 11:10s 068 OPT1 Bit5:P/N/S crystals application (0=2 crystals,P/S/N application 1=1 crystal,P/N/S 048 OPT2 4.43MHz application) 016 OPT3 Bit4:Cutoff loop(0=OFF,1=ON)(be used to set the bit6 of register 0x0c 0f stv2248) 255 OPT4 Bit3:Safty_Reset(0=active,1=non) 00 OPT5 Bit2:Power on keep standby (0 = Last power memory function, 1= Standby state 00 STTT after power on) 187 VPL Bit1:PIF overmodulation(0=OFF,1=ON) 00 INGN Bit0:LOGO display(0=OFF,1=ON) 159 SVC c)OPT2 001 HPOSD Bit7:Market_france---SECAM LL(0=OFF,1=ON) 10 VPOSD Bit6:Manual/Auto cutoff(0= Manual ,1= Auto) 050 HPTXT Bit5:ENG_LOG_RUS_FARSI (0= the characters of LOGO and LABEL will 15 VPTXT changed automatically while Russian language is selected, 1= the English characters 111 MISC of LOGO and LABEL will not changed automatically while Russian language is selected) Bit4: COLOR 6dB(0=OFF,1=ON) Bit3: APR Feature (0=ON,1=OFF) Bit2: Black Stretch (0=ON,1=OFF) Bit1: Auto Flesh(0=ON,1=OFF) Bit0: RGB OSD CONTRAST(0=contrast control disable,1=contrast control enable) d)OPT3 Bit7:Sound demodulation (0 = intercarrier, 1 = QSS) Bit6:Smart volume control(0= no use,1= use) Bit5:Woofer (0= no use,1= use) Bit4: AVL (0=OFF,1=ON) Bit3: 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=AV1/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 =CVBSOUT2 is always CVBSIN1, 1 = According to AV1/AV2/RGB/AV3, CVBSOUT2 is CVBS1,CVBS2,Y/CVBS3 or Y+ C) Bit4:SVHS_SET(0 = only AV3, 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 =OFF,1=ON) f)OPT5 Bit0=enable the remote controller to change Run_Time_Mode Choice Bit1, Bit2= "Run_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, Arabic, Persian, Greek, Hebrew...) ST West-europe MCU(sixteen kinds of language ENGLISH / FRENCH/ SWEDISH/ TURKISH/ GERMAN/ PORTUGUESE/SPANISH/ ITALIAN/ FARSI/ POLISH/ RUSSIAN/ RUMANIAN/ SERBIAN/ CZECH/ ESTONIA/
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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. Bit1, Bit2, Bit3=select the correct process ROM_M6_P_valid OSDEPROM_M6_R_ valid ROM_M6_P_valid EPROM_M6_R_ valid EPROM_M6_R_ validROMLESS_H5_P_valid ROM_H5_P_valid EPROM_M6_A_ valid /*note:ROMLESS_M6_R_valid=ROM_M6_R_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. l) VPOSD Vertical position for OSD. m) HPTXT Horizontal position for teletext . n) VPTXT Vertical position for teletext . o) 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, 1 =use) Bit5: XRAY_SET(0 = no use, 1 = use ) Bit4:FS_TUNER_SET2(0:unuse 1:use(L:49.75~144.25M:152.25~424.25H:432.25~863.25 (PIF:38.0Mhz))) 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_SET1are both zero, then L:48.25~147.25M:154.25~423.25H:431.75~855.25(PIF:38.9Mhz) Bit2:FS tuner UHF port set(0= p2,1= p3) Bit1:FS_380_389(0= PIF38.0 ,1= PIF38.9) Bit0:VS/FS (0= VS,1= FS)

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7. Service and Design Data
SERVICE white balance
SR. NO.
1 2 3 4 5 6 7 8 9 10 11 12

PARAMETERS Description
RCUT GCUT BCUT RDRV GDRV BDRV SUBR SUBG BMAX BMIN ATHD LOGO Red cut-off Green cut-off Blue cut-off Red drive Green drive Blue drive Sub Red Sub Green Brightness maximum. Brightness minimum APR_threshold LOGO set

VALUE
49 68 60 32 32 32 32 32 57 10 15 00

NOTE

SERVICE 1
SR. NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

PARAMETERS Description
HP50 VP50 VAP50 HP60 VA60 VAP60 VZM VWD CNTX COLC STINT TAGC VCOC VCOF VCOCL1 VCOFL1 Hpos 50Hz Vpos 50Hz V size 50Hz Hpos 60Hz Vpos 60Hz V size 60Hz V zoom size V wide size Contrast maximum. Colour center. Bub tint. Tuner AGC VCO coarse VCO fine VCO coarse L1 VCO fine L1

VALUE
37 08 26 31 15 35 35 12 63 32 32 42 06 58 09 56

NOTE

SECAM LL' use : TAGC=28

SERVICE 2
SR. NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

PARAMETERS Description
VS50 VS60 VSH VSC VCC EWVC EWAP EWSP EWTP BGC FGC BAC CUSL CUSH MOD BVLP V saw50 V saw60 V sh(50 and 60) V sc V cc EW vdc EW amp EW shape EW trap Background color Foreground color Bar color Custom code low byte Custom code high byte Option of the software Option of the software

VALUE NOTE
00 00 24 05 07 31 00 29 22 111 113 111 002/028 253/227 058 192 No Use No Use No Use No Use No Use No Use No Use No Use No Use

Roadstar:002 / Keymat: 028 Roadstar:253 / Keymat: 227 TACT SWITCH 6:058/TACT SWITCH 5:059

12

SERVICE 3
SR. NO.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

PARAMETERS Description
AGCG OPT1 OPT2 OPT3 OPT4 OPT5 STTT VPL INGN SVC HPOSD VPOSD HPTXT VPTXT MISC AGC gain Option 1 Option 2 Option 3 Option 4 Option 5 ST Ttext Voltage protect level for XRAY Input gain for tda7449 Smart volume control for stv8216 HPOS OSD VPOS OSD HPOS TXT VPOS TXT Option for functions

VALUE
00 64 48 144/145 255 00 00 187 00 159 001 10 50 15 111 SECAM LL' no use:48 / SECAM LL' use:176 MONO:144 / STEREO:145 AV1 USE:255 / AV1 NO USE:254

8ICs Functional Description
TDA8174A
PIN 1 2 3 4 5 6

Function : Vertical Output
PIN CONNECTIONS Power Out Output Stage Vs Trigger Input Height Adjustment Voltage Ref Decoupling Gnd PIN CONNECTIONS Vs OUT SVR IN PIN CONNECTIONS Vs OUT SVR IN N.C. S-GND N.C. N.C. PIN CONNECTIONS CREF Vs PGND ROUT PIN 7 8 9 10 11 PIN CONNECTIONS Ramp Generator Buffer Output Inverting Input Supply Voltage Flyback Generator

TDA7267
PIN 1 2 3 4

Function : Audio Output
PIN 5 6 7 8 PIN 5 6 7 8 5 6 7 8 PIN 11 12 13 14 PIN CONNECTIONS GND GND GND GND PIN CONNECTIONS P-GND P-GND P-GND P-GND P-GND P-GND P-GND P-GND

TDA7267A
PIN 1 2 3 4 5 6 7 8 PIN 1 2 3 4

Function : Audio Output

TDA7449(ONLY IN STEREO MODEL)

Function : Digitally Controlled Audio Processor
PIN CONNECTIONS MUXOUT(R) BIN(R) BOUT(R) BOUT(L)
13

5 6 7 8 9 10

LOUT R_IN2 R_IN1 L_IN1 L_IN2 MUXOUT(L)

15 16 17 18 19 20

BIN(L) TREBLE(L) TREBLE(R) DIG_GND SCL SDA

9Test Point Waveforms
2Vpp 1Vpp 3.8Vpp 3.8Vpp 3.8Vpp

H STV2248 95Vpp PIN13

H STV2248 PIN18 95Vpp

H STV2248 PIN32 95Vpp

H STV2248 PIN31 7Vpp

H STV2248 PIN30 5Vpp

H H CRT KR 4.5Vpp H CRT KG 1.3Vpp H CRT KB 0.7Vpp H STV2248 PIN48 1000Vpp STV2248 PIN49 23Vpp

V STV2248 PIN47 75Vpp ST92192 PIN50

H V444 B

H V411 C

H HEATER

H V444 C

10. IC Voltages
ST92195
Pin Voltage Pin Voltage Pin Voltage 1 5.0 20 3.6 39 5.0 2 5.0 21 5.0 40 0.8 3 0.1 22 0.1 41 0.8 4 5.0 23 0.1 42 5.0 5 0.2 24 0.0 43 5.0 6 4.9 25 5.0 44 0.1 7 0.1 26 5.0 45 0.1 8 0.0 27 1.7 46 0.1 9 0.1 28 5.0 47 5.0 10 0.1 29 2.1 48 0.1 11 0.1 30 0.4 49 5.0 12 0.1 31 5.0 50 2.4 13 0.1 32 4.9 51 2.3 14 0.1 33 0.1 52 0.1 15 0.5 34 1.3 53 0.1 16 0.5 35 0.0 54 0.1 17 0.5 36 0.0 55 3.1 18 0.1 37 0.0 56 5.1 19 3.2 38 2.0

STV2248
Pin Voltage Pin Voltage Pin Voltage 1 2.5 20 2.8 39 1.0 2 2.5 21 2.6 40 1.7 3 2.6 22 2.8 41 2.4 4 3.2 23 1.7 42 2.8 5 2.7 24 1.7 43 0.0 6 2.5 25 2.5 44 3.2 7 2.5 26 1.7 45 7.1 8 1.8 27 2.5 46 5.6 9 2.0 28 0.0 47 4.1 10 0.0 29 4.0 48 3.2 11 3.9 30 1.7 49 0.6 12 5.0 31 1.7 50 4.1 13 2.9 32 1.7 51 3.6 14 2.4 33 3.7 52 3.2 15 4.0 34 4.4 53 5.0 16 3.9 35 4.4 54 0.0 17 7.9 36 4.3 55 3.8 18 3.2 37 0.0 56 1.2 19 0.0 38 0.1

TDA8174A
Pin 1 2 3 4 5 6 7 8 9 10 11
14

Voltage

13.3

26.9

3.9

6.7

4.5

0.0

7.5

8.3

4.5

26.8

1.5

TDA7267
Pin Voltage 1 14.9 2 7.6 3 8.1 4 0.9 5 0.0 6 0.0 7 0.0 8 0.0

STV7267A
Pin Voltage 1 14.9 2 7.6 3 8.1 4 0.9 5 0.1 6 0.0 7 0.1 8 0.1 9 0.0 10 0.0 11 0.0 12 0.0 13 0.0 14 0.0 15 0.0 16 0.0

TDA7449
Pin Voltage 1 4.0 2 7.9 3 0.0 4 3.3 5 3.3 6 4.0 7 4.0 8 4.0 9 4.0 10 4.0 11 4.0 12 4.0 13 4.0 14 4.0 15 4.0 16 4.0 17 4.0 18 0.0 19 3.6 20 3.2

AC supply :

176~260V 50/60Hz

11. Other
1) binary digit change to algorism
binary digit algorism Bit0 1 Bit1 2 Bit2 4 Bit3 8 Bit4 16 Bit5 32 Bit6 64 Bit7 128 OPTION2 Bit7 Bit6 Bit5 Bit4 Bit3 binary digit 0 0 1 1 0 algorism 128 64 32 16 8 binary digit 00110000= algorism 32+16=48

Bit2 0 4

Bit1 0 2

Bit0 0 1

Note: 0= N o use 1=Use

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 "-/--" "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 Volume0.30.7V Volume+ 0.81.2V Program1.31.7V Program+ 1.82.2V Menu 2.32.7V No use 2.83.2V AV 3.33.7V
15

3.84.2V

POWER

16