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Hitachi 32LD7800TA, Service Manual

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Hitachi 32LD7800TA Service Manual Download Page 42

42

32LD7800TA (PW2L) 

 

[ Signal Circuit ]

Is 

the waveform 

at pin 49 of PTV2

(TV, CV)?

Exchange Video 

PWB

Exchange sub 

tuner PWB

Exchange tuner 

PWB

Exchange

 Formatter PWB

Exchange Panel

Change back original 
Tuner PWB

Change back original 
sub tuner PWB

Change back original Video PWB

Change back panel

no picture of TV(main)

Is 

the waveform 

at pin 7 of PTV3

(TV, CV)?

no picture of TV(sub)

Change back original Formatter PWB

Exchange Joint PWB

Finish repair

Finish repair

Finish repair

picture (normal)

picture (normal)

picture (normal)

picture (normal)

No picture

No picture

No picture

No picture

No picture

Yes

Yes

No

No

picture (normal)

Summary of Contents for 32LD7800TA

Page 1: ... 13 Wiring diagram 56 Contents 1 Since Panel Module is made of glass handling the broken Module shall be taken care sufficiently in order not to be injured 2 Replacing work shall be started after the Panel Module and the AC DC Power supply become sufficiently cool 3 Special care shall be taken to the display area in order not to damage its surface 4 The Panel Module shall not be touched with bare ha...

Page 2: ...u will die or take damage by electric shock if you touch to live part Use recommended components Please use to same characteristic compo nent which is same as previous for your safety and keep reliability especially marked by in parts list and circuit diagram It is reason of electric shock or fire if you use non recommended component Should be kept same style of wiring or component Monitor uses tu...

Page 3: ...play distortion High Performance Digital Processor A wide range of input signals can be handed including composite component and HDMI High Definition Digital Pro cessor creates the fine textured image with dynamic contrast In addition it corresponds to a broad array of per sonal computer signals from 640 x 400 and 640 x 480 VGA to 1600 x 1200 UXGA Analog Input Easy to use remote control and on scr...

Page 4: ...on green 0 3 Vp p 75 Ω ANT 75Ω Unbalanced PAL B G H I D K SECAM B G D K K1 NTSC M AV1 composite video input terminal RCA AV1 Y PB PR video input terminal RCA AV1 L R audio input terminal RCA AV2 composite video input terminal RCA AV2 Y PB PR video input terminal RCA AV2 L R audio input terminal RCA AV3 composite video input terminal RCA AV3 S video input terminal AV3 L R audio input terminal RCA A...

Page 5: ...r from soldered joints when replacing components If leaded solder should be added to existing lead free joints mix in the leaded solder thoroughly after the lead free solder has been completely melted do not apply the soldering iron without solder Servicing soldering iron A soldering iron with a temperature setting capability temperature control function is recommended The melting point of lead fr...

Page 6: ...TURE MODE button CH I CH II button TV CHANNEL UP DOWN button TV MUTE button MULTI PICTURE button SWIVEL button T TEXT button TV Control panel indicates the function while the MENU is displayed on the screen SUB POWER button VOLUME UP DOWN buttons ADJUST buttons CHANNEL UP DOWN buttons SELECT buttons MENU button INPUT SELECT button OK button Remote control receiver Indicating lamp The main power sw...

Page 7: ...K FLASH I O 41 BUSY FLASH I O 42 TXD0 PDP I O 43 RXD0 PDP I O 44 SDA4 panel I O 45 SCL4 panel I O 46 M_ENABLE I O 47 M_SCLK I O 48 M_SDA I O 49 M_WAKEUP I O 50 PDPGO PM_ON I O 5V NC OSD DATA OSD CLK GND CNVSS FLASH TRAP MAIN FUNCTION 5V Head Phone Volume Memory Protect AGC Voltage F E FC DATA FC CLOCK FC DATA SYNC SW SYNC SW RESET OSC OUT GND OSC IN 5V 5V PULL UP IR Signal TA1370 LA7213 COMPONENT2...

Page 8: ...GC_I M I O AGC Voltage Main TUNER 94 FE_AGC_I S I O 95 HP_DETECT I O 96 HDMI_DET I O 97 INT_HDMI I O 98 NC I O NC 99 COMP_SW I O 100 DEMP_OUT I O PDP PALEL Contorol FRASH MEMORY Writing Detecting VIDEO PWB I2C䋨to PWB TUNER side䋩 FE MSP3455or MSP3415G SAA5361 TB1274 Sub M306V7 M62320P I2C䋨to PWB TUNER side䋩 FE MSP3455or MSP3415G SAA5361 TB1274 Sub M306V7 M62320P HDMI Reset Hot Plug Detect Reset Det...

Page 9: ...20 NC I O NC 121 AD_KEY3 I O 122 AD_KEY2 I O 123 AD_KEY1 I O 124 TV POWER I O 125 DIP DET I O 126 POWER_SAVE I O 127 GND I 128 I O Function 1 Function 2 LCD PANEL I2 C BUS Contorol CLOCK I2 C BUS Contorol DATA I2C BUS Contorol CLOCK I2C BUS Contorol DATA Detecting HDMI circuit connection OSD CS FC ENABLE NC EXTERNAL RESET FAN ALARM AD KEY1 INPUT POWRE ON OFF H ON䇮L STANDBY DIP DET NC HDMI AUDIO SW...

Page 10: ...10 32LD7800TA PW2L Block diagram ...

Page 11: ...used for selecting adjustment code buttons are used for changing data values OK button is used for confirming the data After finishing the necessary adjustment press MENU button Adjustment mode is released and the set returns to normal condition Memory Initialize operation NOTE The execution of this function returns the adjustment codes to the preset values therefore adjustment data will be lost P...

Page 12: ...12 32LD7800TA PW2L Service adjustment items by I2C bus control MAIN Part ...

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Page 25: ...25 32LD7800TA PW2L Service adjustment items by I2C bus control SUB adjust menu ...

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Page 29: ...29 32LD7800TA PW2L E 2 ...

Page 30: ... YCBCR HD HD1 10 of Component TV NTSC HD PC PC signal Video Input Judgment of H Frequency Video Input Setup Mode AV1 AV2 15 75kHz 576i Auto PAL2 SDTV DVD PAL2 HDTV PAL3 15 75kHz 480i Auto NT2 SDTV DVD NT2 HDTV NT3 31 25kHz 576p Auto HD10 SDTV DVD HD10 HDTV HD9 31 50kHz 480p Auto HD3 SDTV DVD HD3 HDTV HD2 45 00kHz 720p Auto HD5 SDTV DVD HD6 HDTV HD5 28 125kHz 1080i Auto HD7 SDTV DVD HD8 HDTV HD7 33...

Page 31: ...31 32LD7800TA PW2L ...

Page 32: ...32 32LD7800TA PW2L ...

Page 33: ... mal in black level contrast and color In this case it will be recovered by re adjustment in the specified way NOTE Never adjust without use of the specified signal If that were done by mistake the picture would become abnor mal in black level contrast and color In this case it will be recovered by re adjustment in the specified way ...

Page 34: ...34 32LD7800TA PW2L ...

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Page 36: ...36 32LD7800TA PW2L ...

Page 37: ...37 32LD7800TA PW2L ...

Page 38: ...N IN ON To escape from this mode press the SUB POWER button INPUT SELECT button and button at the same time and hold for more than 5 seconds Burn in mode will be released How to recover the remote and the center of the upper key function If remote and the center of the upper key cannot operate after miss set special function by the center of the upper keys these functions can recover by below meth...

Page 39: ...V Joint or Formatter PWB Power supply unit No No Yes Yes Joint or Formatter PWB Sub power board Power supply unit Yes high Sub Power board Is the voltage applied to CN6 1 of Power supply unit Yes 1 3 3V 2 5V 6 7 12V Yes Yes Yes Speaker Picture is displayed But no sound Are the voltages applied to PAJ1 1 2 6 7 of the Audio PWB Are the signals applied to PAF1 2 4 of the Audio PWB No Audio PWB 2 L ch...

Page 40: ...ut signal Cable or Formatter PWB Yes No Inverter unit No Yes 1 5V 7 5V Is Voltage applied to P804 1 pin of the Power supply unit Is Voltage applied to PJF1 7 pin of the Joint PWB Power supply unit No Yes Joint PWB Formatter PWB Power supply unit Joint or Formatter PWB Power supply unit No Yes Formatter PWB or Panel Module Is the voltage of PFJ1 1 pin PFJ2 1 2 pins applied to of the Formatter PWB P...

Page 41: ...ange Formatter PWB Change back original Tuner PWB Change back original Video PWB Change back original Formatter PWB Exchange Joint PWB Finish repair Finish repair Finish repair Finish repair Still no Teletext Still no Teletext Still no Teletext Teletext normal Teletext normal Teletext normal ...

Page 42: ...Change back original sub tuner PWB Change back original Video PWB Change back panel no picture of TV main Is the waveform at pin 7 of PTV3 TV CV no picture of TV sub Change back original Formatter PWB Exchange Joint PWB Finish repair Finish repair Finish repair picture normal picture normal picture normal picture normal No picture No picture No picture No picture No picture Yes Yes No No picture n...

Page 43: ...ormatter PWB Change back original Tuner PWB Change back original Video PWB No sound of TV main Change back original Formatter PWB Exchange Joint PWB Finish repair Finish repair sound normal Finish repair sound normal Finish repair sound normal Still no sound Still no sound Still no sound ...

Page 44: ...ormatter PWB Change back original sub tuner PWB Change back original Video PWB No sound of TV sub Change back original Formatter PWB Exchange Joint PWB Finish repair Finish repair sound normal Finish repair sound normal Finish repair sound normal Still no sound Still no sound Still no sound ...

Page 45: ...eo PWB Change back original Formatter PWB Change back original HDMI PWB No HDMI no picture no color or dark Change back original Video PWB Exchange Joint PWB Finish repair Finish repair HDMI normal Finish repair HDMI normal Finish repair HDMI normal Still no HDMI Still no HDMI Still no HDMI ...

Page 46: ...not operate Exchange Video PWB Exchange Formatter PWB Exchange Joint PWB Change back original Formatter PWB Change back original Video PWB Change back Joint PWB Exchange stand Finish repair Finish repair Finish repair Finish repair OK OK No No No OK ...

Page 47: ... circuit self diagnosis function This function is for the failure of the signal circuit for example the phenomenon as below Sometimes power turns off abnormally Sometimes picture disappears abnormally To enter to this Self Diagnosis mode follow the next steps Preparation 1 The Power Cord should be connected to AC line and the Main Power switch should be turned on 2 Turn the power off by the SUB PO...

Page 48: ...C4 6 DVI AV AV5 AV6 D SUB15P AUDIO VIDEO OSC 16MHZ Formatter PWB TMDS RECEIVER LVDS Transmitter Audio Power Supply Digital Audio Amp Audio Processing Speaker x 2 Audio Signal Audio PWB AV SW Teletext Headphone 3D 3L Comb Filter Video Chroma Decoder HDMI PWB Digital RGB RGBHV Differential Signal Digital Video PWB FE MSP Tuner PWB Inverter Power Monitor Out Headphone Out ANT Sub Power Unit Block dia...

Page 49: ... H V HDMI L R SCL5 SDA5 HDMI INT HPD RESET HDMI DET I2S I2S L R L R IN L R OUT MUTE INT TMDS TMDS SCL SDA SCL SDA DSCL DSDA Y Cb Cr HD VD 5V HPD EDID PROTECT WP DEMP 5V 3 3V RESET H 3 3V STB 5V 5V 8V 5V 2V EEPROM CAT24WC04JI WP Reset PST3642 5V 5V SCL0 SDA0 9V 3 3V 2 5V Reset BD4729G RESET 3 3V 5V 5V DET DET AV2 YDET AV1 YDET Y Y 10V H 3 3V 3 3V 3 3V T 5V T 5V 5 5V 8 2V T 5V SIF M TEXT B lank S TE...

Page 50: ...50 32LD7800TA PW2L 10 Disassembly diagram PC ABS ABS ABS ...

Page 51: ...51 32LD7800TA PW2L Panel Module inverter Panel Module Spare Part Name Spare Part No Panel Module DD00691 Inverter board one pair TP01374 Panel Module with inverter board ...

Page 52: ...power boards In case of detaching the cable from the clamp 1 Detach the connector from the power board 2 Twist off the screws for the power board and detach the power board 3 Then detach the cable from the clamp In case of attaching the cable from the clamp 1 Put the cables through the clamp 2 Fasten the power board with screws 3 Attach the connector to the connector base of its power board ...

Page 53: ...ure to set the guide posts of unit deep enough into the hole on the in display when inserting the video unit In case that it is stuck during the mounting please readjust the position without pushing it by constraint Guide Post ...

Page 54: ...AUDIO 14 TP01336 PWB ASS Y JOINT 15 TP01337 CORD 2P 16 TP01338 CONNECTOR FFC 50P 17 TP01339 CONNECTOR FFC 50P 18 TP01341 POWER UNIT 19 TP01342 SUB POWER UNIT 20 TP01343 SPONGE 21 TP01344 SCREW M3X0 5 6I ZK 22 TP01345 SCREW M3X0 5 4I ZK NL 23 TP01346 CARTON BOX 24 TP01347 USER S MANUAL 25 TP01348 EPE BAG 26 TP01349 EPE SHEET 27 TP01351 TOP CUSHION 28 TP01352 29 TP01353 LEFT CUSHION 30 TP01361 PWB A...

Page 55: ...55 32LD7800TA PW2L 12 Connection diagram ...

Page 56: ...1 P802 P806 PAS1 PAS2 FERRITE CORE CN5 CN4 CN6 P805 P807 CN1 LED board P803 P804 To SP Right PJF3 PFJ1 PFJ2 PFV1 PFJ3 PFM1 PFA2 PFA1 PFK1 PFL1 PFJ5 PJP2 PJF6 PJP5 JOINT board SUB POWER board CN6 1 CN4 1 CN5 1 SW902 SW901 INVERTER board INVERTER board AUDIO board POWER board FORMATTER board P800 Inlet CN02 CN01 CN05 CN04 CONTROL board speaker terminal ...

Page 57: ...57 32LD7800TA PW2L Memo ...

Page 58: ...YK No 015E Digital Media Division Printed in Japan JE QR63761 32LD7800TA ...

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