Sanyo 14GX37 User Manual Download

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SERVICE MANUAL

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SANYO IIC CHASSIS

PAL/SECAM/NTSC(AV)
COLOR TV RECEIVER

For user's safety (to meet the safety requirements of

some countries), the receiver should be kept in its initial

status. Only same spare parts can be replaced with.

Contents

Page

Specifications

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Remarks

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Description of new circuit

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Maintenance adjustment

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Trouble shooting

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Chassis circuit diagram

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Block diagram

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Replaceable parts list

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WARNING

Some parts of the receiver are charged. Separate transformer must be used between the mains plug and the

socket when repairing the chassis.

To prevent electric shock, do not remove the outer cover. No user serviceable parts inside. Please refer

servicing to qualified service personnel.

Summary of Contents for 14GX37

Page 1: ...ge Specifications Remarks Description of new circuit Maintenance adjustment Trouble shooting Chassis circuit diagram Block diagram Replaceable parts list WARNING Some parts of the receiver are charged Separate transformer must be used between the mains plug and the socket when repairing the chassis To prevent electric shock do not remove the outer cover No user serviceable parts inside Please refe...

Page 2: ...t be dealt with until the anti shock screen is worn and the high voltage system is discharged thoroughly X ray This receiver is designed to keep the X radiation to absolute minimum Yet malfunction or servicing might cause the danger of exposing sealed areas to excessive radiation Therefore the precautions below must be followed 1 During servicing never let the high voltage of the receiver exceed 2...

Page 3: ...V2 38 6 VOLUME R MUTE 37 7 POWER WOOF ON OFF 36 8 VT SIF 35 9 GND IR 34 10 XTAL1 SD 33 11 XTAL2 S VHS 32 12 VDD ENABLE 31 13 KEY IN SCL1 30 14 AFT IN SDA1 29 15 NC SCL0 28 16 AC DETECT SDA0 27 17 RESET NC 26 18 FILT BLANK 25 19 CHROMA B OUT 24 20 V SYNC G OUT 23 21 H SYNC R OUT 22 1 2 CPU ports description pin Port usage Function description ...

Page 4: ...tion 20 VS V SYNC Vertical pulse input 21 HS H SYNC Horizontal pulse input 22 R R OUT OSD red signal output 23 G G OUT OSD green signal output 24 B B OUT OSD blue signal output 25 BL BLANK OSD blanking signal output 26 I NC Not used 27 P60 SDA0 SDA0 IIC data EEPROM use 28 P61 SCLK0 SCL0 IIC clock EEPROM use 29 P62 SDA1 SDA1 IIC data other IC use 30 P63 SCLK1 SCL1 IIC clock other IC use 31 P70 INT0...

Page 5: ...0 1 1 0 1 0 1 0 1 0 1 Pin1 UHF x x x x x x 0 0 1 1 1 0 BAND OPTION LA7910 TUNER PORT H POTR L Port V L V H UHF V L V H UHF V L V H UHF V L V H UHF Pin42 BAND1 0 1 1 0 1 1 1 0 0 0 1 1 Pin41 BAND2 0 0 1 1 0 1 0 1 0 1 0 1 Pin1 UHF x x x x x x 0 0 1 1 1 0 1 3 3 AV control a One way AV PORT TV AV Pin39 AV1 0 1 Pin38 AV2 0 1 b Two way AV PORT TV AV1 AV2 Pin39 AV1 0 0 1 Pin38 AV2 0 1 1 c Three way AV POR...

Page 6: ...can be selected Then Pin5 and Pin6 of the CPU can be used as L R volume output control 1 3 7 Sensitive receiving output control in SETUP mode if SENSITIVITY is set to 1 then the function of controlling sensitive receiving tuner is selected Pin40 is used as control output PORT SENSITIVITY YUV ON SENSITIVITY YUV OFF Pin40 1 0 1 3 8 Mute control a POWER ON OFF POWER OFF POWER ON POWER OFF POWER OUT H...

Page 7: ...ol button are pressed simultaneously the local button is prior to remote control button 3 2 Definitions of user s remote control buttons Button English name Chinese name Function description Remark 0 0 0 Channels selected directly by figure button 9 9 9 10 Direct selection by double or triple digit numbers 11 TV AV TV AV TV AV switch 12 GAME GAME control 13 14 MENU Control menu switch 15 WOOF Woof...

Page 8: ...CC 8 17 9 16 10 15 11 14 G1 12 13 C1 C2 C3 VD1 R1 R2 V1 PIN1 PIN4 PIN2 PIN3 3 1 2 0 PIN20 7 5 6 4 PIN19 TV AV 9 8 PIN18 WOOF MENU GAME PIN17 POS PROD POWER VOL PIN16 POS JUMP MUTE VOL PIN15 DISPLAY P P RECALL SLEEP PIN14 SYSTEM AUDIO OPTION PICTURE PIN13 1 N1 LC7461M 8103 2 VD1 IR LED 3 V1 2SC1815 4 R1 RT14 1 4W 1Ω J ...

Page 9: ...tion of POWER OPT if 0 is selected then the POWER is always in POWER OFF status after turn on if 1 is selected then the POWER status will be determined according to the memory before turn off In POWER OFF mode only POWER button works The other buttons do not work But the local POS and POS buttons can be used to turn on the TV set instead of POWER button SLEEP and TIME OFF settings will be cancelle...

Page 10: ...9 positions directly Press button to enter into two digit or three digit figure mode before selecting programs in 10 254 positions max programs is determined by the capacity of EEPROM then press 0 9 to key in figures in the order of hundred s ten s and unit s place to select programs directly The button does not work if the number is beyond the position max Auto mute and black background function ...

Page 11: ...hold this button for more than 1second the position will increase or decrease by 1 for each 800ms If all program positions are in MEMORY OFF status then press POS and POS buttons can only select the program in 0 position If only one position is in MEMORY ON status then press POS POS buttons can select the only program in the position of MEMORY ON After reaching the maximum position stored press th...

Page 12: ...ription When switch is finished the information of the current position and the last position will change and the result will be stored in EEPROM automatically In 888 and Car racing games this button is used to play games while in Tetris game this button is used to pause the game 3 OSD display same as position OSD display 4 6 DISPLAY remote control button 1 Function Program position display includ...

Page 13: ...play games 2 Description When it is used to control volume output each press of the button will increase decrease output by one step the output is divided into 100 steps Press and hold the button for over 500ms then the output will increase decrease one step for each 160ms When output reaches 100 press VOL again will not work if the output reaches 0 then press VOL will not work In MUTE mode press ...

Page 14: ...me In B W BALANCE mode MUTE button is used to switch between normal status and a line status If the LINE MODE on menu3 is 1 the full screen is switched to a light line and the picture status will automatically turn to FACTORY1 mode when the light line is switched to full screen the picture status will automatically turn to FACTORY 2 mode If LINE MODE is 0 the picture status will not change during ...

Page 15: ...change as follows PICTURE menu AUDIO menu SYSTEM menu CLOCK menu none CHANNEL menu PRESET menu PRESET menu operation instruction When OSD display is neither one of those of PICTURE AUDIO SYSTEM CLOCK PRESET or CHANNEL menu press MENU button the OSD of PICTURE menu will display first In AV mode neither PRESET nor CHANNEL menu will turn up in the cycle when MENU button is pressed If stereo control f...

Page 16: ...completed the color system of the program positions stored is set to AUTO the sound system is the same as that of the position before auto search If the position of a certain program is set to REMEMBER OFF this position will be skipped off when POS POS is used to change positions If button or 0 9 buttons are used to select the REMEMBER OFF position directly its position display will become red for...

Page 17: ...t During the operation OSD display will show CLEARING ALL for attention When CLEAR ALL is completed program position will jump to 0 automatically If no operation is performed within 1o seconds CHANNEL menu will quit automatically 6 CHANNEL menu OSD display about 10 seconds CHANNEL EXCHANGE 10 CLEAR ALL 4 11 AUTO local button 1 Function to start auto search mode directly 2 Instruction Press AUTO bu...

Page 18: ...t value of an option selected is changed the bar like OSD will indicate its changing direction with an arrow Press VOL can increase output value until it reaches the max 100 Press VOL can decrease the output value until it reaches the minimum 0 When the color system is set to AUTO and the input signal is NTSC or forced NTSC with color OSD will present TINT option In other cases there is no TINT op...

Page 19: ...ROMINANCE SHARPNESS TINT STANDARD 80 80 50 50 00 SOFT 70 40 60 25 00 VIVID 60 100 88 70 00 LIGHT 100 100 70 72 00 FACTORY1 00 00 00 00 00 FACTORY2 100 100 00 00 00 4 OSD display about 5 seconds STANDARD 4 14 AUDIO remote control button 1 Function enter into AUDIO menu 2 Description If stereo function is not set or stored in EEPROM then AUDIO button do not work If simple stereo is set then treble a...

Page 20: ...t 10 seconds AUDIO VOLUME 25 TREBLE 50 BASS 50 BALANCE 00 25 4 15 CLOCK remote control and local buttons 1 Function to enter into CLOCK menu 2 Description CLOCK menu operation description Press CLOCK button to enter into CLOCK menu If time is not set after start up OSD display of the options is yellow If time is set then the options are in green OSD display Use Clock button to select in circles or...

Page 21: ...ic start up can cancel the setting of SLEEP automatically If POSITION is set the desired position will be entered into upon start up at the on time or preset time If timer function is selected the program on the preset position will start automatically at the preset time If attention timer is set ATTENTION in big red letters will be seen flashing on the screen at the preset time until any button i...

Page 22: ...s selected then the menu has no LANGUAGE option If SENSITIVITY is selected SENSITIVITY is set to 1 the menu has SENSITIVITY option Its mode is remembered separately like color system sound system The auto mute function is enabled during sensitivity mode modification If calendar function is selected CALENDAR is set to 1 there is a CALENDAR option Select this option and press VOL or VOL button to en...

Page 23: ...nformation on sleep time reminding that the TV will be turned off 3 OSD display about 5 seconds SLEEP 60 4 18 GAME remote control button 1 Function to enter into exit GAME mode 2 Description GAME button works only when at least one game is selected Three games are available totally 888 Car racing and Tetris Use RECALL button to play 888 and car racing games Use RECALL button to pause in Tetris POS...

Page 24: ...l button factory use only 1 Function enter into FACTORY mode B W BALANCE mode ADJUST mode and SETUP mode 2 Description Press PROD button to change as follows NORMAL FACTORY B W BALANCE ADJUST SETUP After enter into FACTORY mode the function of blue background when no signal is received and the function of automatic turnoff when no signal is received within ten minutes will be cancelled and automat...

Page 25: ...5 G BIA Green Bias Green Bias 0 255 B BIA Blue Bias Blue Bias 0 255 R DRV Red Drive Red Drive 0 127 G DRV Green Drive Green Drive 0 15 B DRV Blue Drive Blue Drive 0 127 C B W Cross B W Internal signal 0 3 3 During maintenance one light line can be used to adjust black balance roughly In B W BALANCE mode press MUTE button to enter into one light line mode press MUTE button again will return to full...

Page 26: ...E Horizontal center 0 31 1 NT H PHASE H PHASE NT horizontal center deviation 16 15 2 H BLK LEFT Left blank 0 7 3 H BLK RIGHT Right blank 0 7 4 V SIZE Vertical Size Vertical size 0 127 5 V LINE Vertical Linearity Vertical linearity 0 31 6 V POSI Vertical DC Vertical center 0 63 7 V SC Vertical S Correction Vertical S correction 0 31 8 NT V SIZE Vertical Size NT vertical size deviation 32 31 9 NT V ...

Page 27: ... B Y DC Level 0 15 15 SECAM R Y DC SECAM r Y DC Level 0 15 16 C KILL OFF C_Kill OFF 0 1 17 SND TRAP Sound Trap 0 7 18 VOL FIL Volume Filter Defeat 0 1 19 VIF SYS SW VIF Sys SW 0 3 20 VIDEO LEVEL Video Level 0 7 21 FM LEVEL FM Level 0 31 b Part two No OSD display 0 mode 1 mode 22 POWER OPTION 0 double start up 1 memory 2 or 3 single start up 23 POWER ON LOGO Power logo off Power logo on 24 SCREEN O...

Page 28: ...ar Racing off Game Car Racing on 48 GAME3 OPTION Game Tetris off Game Tetris on 49 CALENDAR Calendar function off Calendar function on 50 V MUTE OFF Video output off before POWER OFF Video output on before POWER OFF 51 BLUE BLACK Blue background without signal Black background without signal 5 3 The application of factory use remote control unit 1 Description For products of the same batch the sel...

Page 29: ...splay This can be applied to practical operation to simplify operation 1 The fixed OSD display of FACTORY BUS OPEN B W BALANCE ADJUST and MUTE can not be cancelled by pressing DISPLAY button 2 In B W BALANCE mode the OSD of adjusting options can not be cancelled by pressing DISPLAY In other OSD status of B W BALANCE mode press DISPLAY can return to the OSD of adjusting options 3 In ADJUST mode pre...

Page 30: ...the factory Therefore a function equivalent to PROD function is specially designed in the software Its operation is as follows First press REVIEW button then press and hold the VOL button on the TV set and meanwhile press the REVIEW button again The function of PROD button is enabled then Repeat the above steps can operate again 6 5 EEPROM initialization function During cold start up CPU will chec...

Page 31: ...ent values Adjusting of display content use POS POS button to select the adjusting options on line1 or line 2 A yellow bar will point out the adjustable characters Use VOL VOL button to adjust the content of characters indicated by the yellow bar Press PP button to select other characters on the same line The OSD of setting menu will keep on displaying After setting is finished press DISPLAY to qu...

Page 32: ...tal voltage meter to TP A 3 4 Press the PROD factory button on the maintenance use remote controller to start adjusting mode 3 5 Press CH button to select RF AGC option Use VOL to adjust the value of RF AGC till the reading on the voltage meter is 2 5V 0 1V 3 6 Press PROD Factory button till exit 5 Vertical size adjustment 5 1 Receive Philips testing PAL system signal 5 2 Press PROD factory button...

Page 33: ...e of the Philips circular test signal 8 5 Press CH button to select OSD CONT option Use VOL to adjust the value of OSD CONT till the character display achieves proper brightness 8 6 Press PROD FACTORY button till exit 9 White balance adjustment 9 1 Receive white field signal 9 2 Press PROD FACTORY button to start brightness darkness balance adjusting mode 9 3 Press CH button and VOL button to adju...

Page 34: ...tput transformer Check VD552 Check horizontal output transformer V431 V432 V902 V922 Check voltage of N101pin Replace N101 Check whether V432 is normal Replace T471 439 L441 C441 Check whether XS901is normal Check the video signal of N101 46 pin Check the video signal of N801 16 pin Check the video signal of N101 42pin Check the video signal of N101 17pin Replace N101 Check N101 T101 A101 N703 Che...

Page 35: ...52 V553 Horizontal raster no vertical scan Check waveform of N101 52pin Check waveform of N101 1pin Check waveform of N801 21pin Check waveform of N801 17pin Check waveform of N601 N602 3 Check voltage of N601 9 pin Check waveform of N101 52 pin Check N101 Check C819 R831 R832 Check N801 Check N601 N602 Check C622 C632 B901 B902 No sound ...

Page 36: ...Reset according to adjusting instruction Check C210 C207 C208 R205R206 Check voltage of N101 39pin 36pin s element 31pin normal or not Check relevant settings open or not No color ...

Page 37: ...д указанной на рисунке кнопкой но сама кнопка не имеет металлизированного напыления Для ТВ Erisson 2107 14GX37 Аналогично модели 2105 пульт модели 2107 14GX37 содержит в себе возможность управления входом в сервисное меню телевизора Контактная площадка находится под указанной на рисунке кнопкой но сама кнопка не имеет металлизированного напыления ...

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