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SERVICE MANUAL
Be sure to read this manual before servicing. To assure safety from fi re, electric shock, injury, harmful radia-
tion and materials, various measures are provided in this HITACHI LCD display.
Be sure to read cautionary items described in the manual to maintain safety before servicing.
1. Since Panel Module is made of glass, handling the broken Module shall be taken care suffi ciently in order
not to be injured.
2. Replacing work shall be started after the Panel Module and the AC/DC Power supply become suffi ciently
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 hand to protect its surface from stains.
5. It is recommended to use clean soft gloves during the replacing work in order to protect not only the dis-
play area of the Panel Module but also a serviceman himself.
6. The Chip Tube of Panel Module (located upper left of the back and surrounded by frame) and fl exible
cables connecting Panel glasses to drive circuit PWBs are very weak, so shall be taken care suffi ciently
not to break. If you break Chip Tube, the Panel doesn't display anything forever.
1. Features --------------------------------------------------3
2. Specifi cations --------------------------------------------4
3. Service points -------------------------------------------5
4. Component names -------------------------------------6
5. New adoption technology -----------------------------7
6. Adjustment --------------------------------------------- 11
7. Troubleshooting --------------------------------------- 38
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
Caution
Service Warning
Contents
LCD Display
November 2004 Digital Media Division
YK
32LD7800TA
8. Seif-Diagnosis Function ----------------------------- 47
9. Block diagram ----------------------------------------- 48
10. Disassembly diagram -------------------------------- 50
11. Replacement parts list ------------------------------- 54
12. Connection diagram --------------------------------- 55
13. Wiring diagram ---------------------------------------- 56
No.015E
(PW2L)
Table of Contents
Related Manuals for Hitachi 32LD7800TA
Summary of Contents for Hitachi 32LD7800TA
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Page 1: Table Of Contents
Be sure to read this manual before servicing. To assure safety from fi re, electric shock, injury, harmful radia- tion and materials, various measures are provided in this HITACHI LCD display. Be sure to read cautionary items described in the manual to maintain safety before servicing. - Page 2 32LD7800TA (PW2L) CAUTION FOR SAFETY Please read this page before repair the monitor. This page explains to following items for keep the safety of set and prevent to accident during repair work. We explain by symbol at happen the damage or injury when took wrong repair.
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Page 3: Features
32LD7800TA (PW2L) PRECAUTIONS How to clean the LCD screen panel of the monitor Before cleaning the monitor, turn off the monitor and disconnect the power plug from the power outlet. To prevent scratching or damaging the LCD screen face, do not knock or rub the surface with sharp or hard objects. -
Page 4: Specifi Cations
32LD7800TA (PW2L) 2. Specifications Display Approx. 32 inches (698 (H) x 392 (V) mm, diagonal 800mm) dimensions Panel Resolution 1366 (H) x 768 (V) pixels Net dimensions 1015 (W) x 618 (H) x 340 (D) mm Net weight 25kg Temperature Operating : 5˚C to 35˚C, Storage : 0˚C to 40˚C... -
Page 5: Service Points
32LD7800TA (PW2L) 3. Service points Lead free solder This product uses lead free solder (unleaded) to help preserve the environment. Please read these instructions before attempting any soldering work. Caution: Always wear safety glasses to prevent fumes or molten solder from getting into the eyes. Lead free solder can splatter at high temperatures (600˚C). -
Page 6: Component Names
32LD7800TA (PW2L) 4. Component names [Main unit] Control panel • Adjustment buttons are located on the top. Remote-control receiver Indicating lamp SUB-POWER button • The main power switch is located on the top. Main power switch VOLUME UP/DOWN buttons Front... -
Page 7: New Adoption Technology
32LD7800TA (PW2L) 5. New adoption technology [System control micom I001(M3062)] Pin function table PIN name FUNCTION VREF (+5.0V) +5.0V OSD_DATA OSD DATA OSD_CLK OSD CLK Head Phone Volume HP_VOL FE.AGC_O(M) AGC Voltage(F/E) FC DATA DATA_OUT(FC) FC DATA DATA_IN(FC) FC CLOCK... - Page 8 32LD7800TA (PW2L) PIN name FUNCTION CPUGO(PM_CPU) PDP PALEL Contorol EPM (FLASH) FRASH MEMORY Writing VIDEO.DET_1 Detecting VIDEO PWB SCL1 I2C to PWB TUNER side FE/MSP3455or MSP3415G/SAA5361/TB1274(Sub)/M306V7/M62320P SDA1 I2C to PWB TUNER side FE/MSP3455or MSP3415G/SAA5361/TB1274(Sub)/M306V7/M62320P HDMI-RESET HDMI-Reset HDMI-HPD_RESET Hot Plug Detect Reset VIDEO.DET_2...
- Page 9 32LD7800TA (PW2L) PIN name FUNCTION CONTROL LCD PANEL SCL0 C-BUS Contorol CLOCK SDA0 C-BUS Contorol DATA SCL3(EEPROM) I2C-BUS Contorol CLOCK SDA3(EEPROM) I2C-BUS Contorol DATA HDMI_CIR_DET Detecting HDMI circuit connection EXT_RESET EXTERNAL RESET OSD_CS OSD CS FC_ENABLE FC ENABLE DTT IRQ...
- Page 10 32LD7800TA (PW2L) Block diagram...
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Page 11: Adjustment
32LD7800TA (PW2L) 6. Adjustment ● How to get to Adjustment mode Using the center of the upper control buttons with the set turned off (standby) can activate it. Press the SUB-POWER( ) button, INPUT SELECT( ) button and button at the same time, and hold for more than 5 seconds. - Page 12 32LD7800TA (PW2L) Service adjustment items by I C-bus control (MAIN Part)
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- Page 25 32LD7800TA (PW2L) Service adjustment items by I C-bus control (SUB adjust menu)
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- Page 30 32LD7800TA (PW2L) The Expression of input signal mode (format) Video Judgment of Video Input PAL1: RF, S and Composite of PAL/SECAM Mode Input H.Frequency Setup PAL2: Component of PAL (YCBCR) 15.75kHz Auto PAL2 PAL3: Component of PAL (YPBPR) SDTV/DVD PAL2...
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- Page 33 32LD7800TA (PW2L) [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.
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Page 38: Troubleshooting
32LD7800TA (PW2L) 7. Troubleshooting How to get to Burn-in mode This mode displays the test patterns of some single color raster in turn. These signals are from built-in generator of LCD panel. So it can be presumed that maybe the panel has some trouble when the screen of Burn-in mode is abnormal. - Page 39 32LD7800TA (PW2L) [ Power ] er cannot be turned on (LED does not light) Is the input voltage applied to Power supply unit? (CN5 [1][3]) Power Power supply Power board switch inlet unit Are the voltages applied to P803 [1][2][5], P804[1],P807[4]...
- Page 40 32LD7800TA (PW2L) [ Power ] Picture is not displayed (LED is lighting) Is the LED red or green/orange? green/orange Is Voltage applied to P804[1]pin of the Power supply unit? Is it the power [1] +5V saving mode? Power supply Input signal Cable...
- Page 41 32LD7800TA (PW2L) [ Teletext Circuit ] No Teletext Teletext(normal) Exchange Video Finish repair Still no Teletext Change back original Video PWB Teletext(normal) Exchange Tuner Finish repair Still no Teletext Change back original Tuner PWB Teletext(normal) Exchange Finish repair Formatter PWB...
- Page 42 32LD7800TA (PW2L) [ Signal Circuit ] no picture of TV(main) no picture of TV(sub) the waveform the waveform at pin 49 of PTV2 at pin 7 of PTV3 (TV, CV)? (TV, CV)? picture (normal) Exchange Video Finish repair picture (normal)
- Page 43 32LD7800TA (PW2L) [ Sound Circuit (MAIN) ] No sound of TV(main) sound (normal) Exchange Video Finish repair Still no sound Change back original Video PWB sound (normal) Exchange Finish repair Formatter PWB Still no sound Change back original Formatter PWB...
- Page 44 32LD7800TA (PW2L) [ Sound Circuit (SUB) ] No sound of TV(sub) sound (normal) Exchange Video Finish repair Still no sound Change back original Video PWB sound (normal) Exchange Finish repair Formatter PWB Still no sound Change back original Formatter PWB...
- Page 45 32LD7800TA (PW2L) [ HDMI PWB Circuit ] No HDMI (no picture, no color or dark) HDMI (normal) Exchange HDMI Finish repair Still no HDMI Change back original HDMI PWB HDMI (normal) Exchange Finish repair Video PWB Still no HDMI Change back original...
- Page 46 32LD7800TA (PW2L) [ Swivel Circuit ] No swivel (can not operate) Exchange Video Finish repair Change back original Video PWB Exchange Finish repair Formatter PWB Change back original Formatter PWB Finish repair Exchange Joint PWB Change back Joint PWB Exchange stand...
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Page 47: Seif-Diagnosis Function
32LD7800TA (PW2L) 8. Seif-Diagnosis Function Signal 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. -
Page 48: Block Diagram
32LD7800TA (PW2L) 9. Block diagram Block diagram 1/2 INVERTER Backlight LCD Panel Moduie Inverter Power AC100V Sub Power Unit -240V Noise Filter Power Unit (Main Power circuit) Main Power SW Signal Power TACT SW PWB Remote Control LED PWB Speaker x 2... -
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32LD7800TA (PW2L) Block diagram 2/2 HDMI PWB IHR1 HDMI.PWB :
SCL5/SDA5 JH11 IH13 +3.3V Reg IH14 IH15 HDMI H+3.3V SI-8033JD Audio HDM I 3.3V CSCL/ Receiver CSDA PCM1754 BA4558F SiI9993 H+3.3V TMDS TMDS L/R-IN L/R-OU T MUTE DSCL/ DEMP DSDA 3.3V... -
Page 50: Disassembly Diagram
32LD7800TA (PW2L) 10. Disassembly diagram PC+ABS... - Page 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 32LD7800TA (PW2L) Caution Assembly / Disassembly Please be careful not to give stress on the power boards R141 and R133 by pushing the cables while dealing with the clamp of cables next to the power boards. In case of detaching the cable from the clamp (1) Detach the connector from the power board.
- Page 53 32LD7800TA (PW2L) Make sure 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.
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Page 54: Replacement Parts List
32LD7800TA (PW2L) 11. Replacement Parts list PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of there components,read carefully,the CAUTION FOR SAFETY of this Service Manual. Don't degrade the safety of the receiver through improper servicing. -
Page 55: Connection Diagram
32LD7800TA (PW2L) 12. Connection diagram... -
Page 56: Wiring Diagram
32LD7800TA (PW2L) 13. Wiring diagram FERRITE CORE CONTROL board ECONT P801 POWER SW PJP1 PJP2 PJF2 PAF2 PAJ1 P802 PJP3 PJF1 P903 PAS1 P806 P904 PJA1 JOINT board AUDIO board POWER board PJF5 PJF6 FERRITE CORE To Panel PJP4 PAS2... - Page 57 32LD7800TA (PW2L) Memo...
- Page 58 32LD7800TA YK No.015E Digital Media Division QR63761 Printed in Japan (JE)