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LG FlatronL204WT, Service Manual

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LG FlatronL204WT Service Manual Download Page 16

- 16 -

2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS

CHECK IC501 INVERTER
ON/OFF PORT

P702 PIN9 5V?

NO RASTER

(OSD IS NOT DISPLAYED)

CHECK POWER BOARD
(LIPS)

CHECK P702

VOLTAGE PIN5,6

(5V)?

NO

NO

NO

NO

CHECK P702 
PIN10  PIN11

POWER BOARD (LIPS)

CHECK 

PULSE AS 

CONTACTING PROBE 

TO THE LAMP 

WIRE OF THE 
LCD MODULE

REPLACE LCD MODULE

YES

1

2

3

4

YES

YES

YES

3

P702-#11

3

P702-#11

Brightness 100

Brightness 0

1

P702-#5,6

4

Lamp current

2

P702-#10

Waveforms

1. CONFIRM BRIGHTNESS

OSD CONTRL STATUS

2. CHECK MICOM DIM-ADJ

PORT

3. CHECK SCALER LAMPADJ

PORT(L204WT/WTM)

Summary of Contents for FlatronL204WT

Page 1: ... http biz LGservice com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO LM62B MODEL L204WT L204WT SFQ A BQF L204WT L204WT BFQ A BQF Same model for Service ...

Page 2: ...fer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG Digital 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 MAX RESOLUTION Analog 1680 x 1050 60Hz Digital 1680 x 1050 60Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 1 2A 5 2 Power Consumption 6 ENVIRONME...

Page 3: ...c T M D S Data1 T M D S Data1 T M D S Data1 3 Shield T M D S Data3 T M D S Data3 5V Power Ground return for 5V H Sync and V Sync Pin Signal DVI D 1 8 9 17 24 16 16 17 18 19 20 21 22 23 24 Hot Plug Detect T M D S Data0 T M D S Data0 T M D S Data0 5 Shield T M D S Data5 T M D S Data5 T M D S Clock Shield T M D S Clock T M D S Clock T M D S Transition Minimized Differential Signaling DVI D Connector ...

Page 4: ...e module from the ESD as it may damage the electronic circuit C MOS Make certain that treatment person s body are grounded through wrist band Do not leave the module in high temperature and in areas of high humidity for a long time The module not be exposed to the direct sunlight Avoid contact with water as it may a short circuit within the module If the surface of panel become dirty please wipe i...

Page 5: ...st receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices ...

Page 6: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Page 7: ...onnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on t...

Page 8: ...x 768 V Lines 60 0 806 768 3 6 29 7 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 8 H Pixels 108 0 67 500 1600 1152 64 128 256 1152 x 864 V Lines 75 000 900 864 1 3 32 9 H Pixels 108 0 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 10 H Pixels 135 0 79 976 1688 1280 16 144 248 1280 x 1024 V Lines 75 035 1066 1024 1 3 38 11 H Pixels 119 6...

Page 9: ...ve the screws Disassemble back cover 1 Pull the front cover upward 2 Then let the all latches are separated 1 Open the Cabinet latch with Jig 2 Disassemble Cabinet 3 Put the front face down 1 4 2 3 Disassemble Connector 5 ...

Page 10: ...gulator 3 3V Vcc 5V 3 3V Inverter 12Lamps 12V Flash ROM DVI D DVI TMDS KEY 1 8V 1 8V 3 3V Module SDA SCL EEPROM System 3 3V ADC TMDS Rx Scaler MStarACE LVDS Tx OSD MCU SSC Line Buffer 12V gm5726H L204WT 15V Regulator 12V EEPROM EDID EEPROM EDID BLOCK DIAGRAM ...

Page 11: ...Part This part consists of the one 3 3V and one 1 8V regulators to convert power which is provided 5V in Power board 12V is provided for inverter 5V is provided for LCD panel and micom in L194WT WTM WTQ case 15V is provided for inverter in L204WT WTM WTQ case Also 5V is converted 3 3V and 1 8V by regulator Converted power is provided for IC in the main board The inverter converts from DC12V to AC ...

Page 12: ...ough a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is for transfer the primary energy to secondary through a power transformer 4 Output rectifier and filter This part function is to make a pulse width modulation control and to provide the driver signal to power switch to adjust the duty cycle during different AC input and output loading condition to achieve the dc ou...

Page 13: ...m is available for LCD Monitor only 1 Port Setup a Copy UserPort sys file to c WINNT system32 drivers folder b Run Userport exe c Remove all default number d Add 300 3FF e Click Start button f Click Exit button 2 EDID Read Write 1 Run WinEDID exe 2 Edit Week of Manufacture Year of Manufacture Serial Number a Input User Info Data b Click Update button c Click Write button ...

Page 14: ...5 seconds and press MENU POWER switch for 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a CLEAR ETI To initialize using time c Auto Color W B balance and Automatically sets the gain and offset value press key for over 3 sec d AGING Select Aging mode on off b Module To select applied module d NVRAM INIT EEPROM initialize 24C16 press key for...

Page 15: ... POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK IC601 1 8V IC602 3 3V LINE NO CHECK CRYSTAL X501 YES CHECK P702 VOLTAGE PIN5 PIN6 5V IS IC601 PIN2 1 8V IC602 PIN2 3 3V CHECK IC501 PIN108 PULSE 1 2 1 3 1 4 Waveforms 1 P702 5 6 2 IC601 2 3 IC602 2 4 IC501 108 YES YES ...

Page 16: ... 6 5V NO NO NO NO CHECK P702 PIN10 PIN11 POWER BOARD LIPS CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE YES 1 2 3 4 YES YES YES 3 P702 11 3 P702 11 Brightness 100 Brightness 0 1 P702 5 6 4 Lamp current 2 P702 10 Waveforms 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT 3 CHECK SCALER LAMPADJ PORT L204WT WTM ...

Page 17: ...01 CHECK IC501 PIN2 3 3V PIN17 1 8V NO NO NO CHECK IC601 1 8V IC602 3 3V U501 PIN 108 109 14 3MHZ CHECK CONNECTION LINE FROM D SUB TO IC501 TROUBLE IN CABLE OR LCD MODULE YES YES NO RASTER OSD IS NOT DISPLAYED CHECK IC501 PIN89 H SYNC AND PIN90 V SYNC IS PULSE APPEARED AT SIGNAL PINS YES 1 Waveforms 1 IC501 108 ...

Page 18: ...UBLE IN DPM TROUBLE IN DPM TROUBLE IN IC501 CHECK PC PC IS GOING INTO DPM MODE NO CHECK H V SYNC LINE NO YES CHECK R720 AND R726 SYNC APPEARED CHECK IC501 PIN89 90 SYNC PULSE YES 1 H SYNC 2 V SYNC Waveforms 1 2 ...

Page 19: ...WIRING DIAGRAM 19 6631900034P 6631900109A 6631900030D 30P 6P 11P ...

Page 20: ...EXPLODED VIEW 20 010 020 070 080 060 090 110 100 120 030 040 050 ...

Page 21: ... Assembly SUB S T LM57G L204WT BFQ KRDBQFN CONTORL TOTAL COMMON L294WT 6871TPT319C PCB Assembly Power 6 LAMP TV MNT MFT POWER TOTAL LIPS FOR 20 1 WIDE CPT EBU30205203 Main Total Assembly L204WTM BFQ BRAND LM57G 35509K0345A Cover L204 PIECE VESA 49509S0051B Plate PRESS SBHG1 1 0 8 SHIELD SPC L204 D SUB DVI 49509K0349A Plate SHIELD GUIDE L204 6410TUW008A Power Cord UL_CSA LP 31 SVT 18X3C LS 13_1 87M...

Page 22: ...1608C0G1H101JT 100pF 5 50V C708 0CK104CK56A 0603B104K500CT 100nF 10 50V C709 0CK104CK56A 0603B104K500CT 100nF 10 50V DATE 2006 06 02 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C710 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C711 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C712 0CK104CK56A 0603B104K500CT 100nF 10 50V C713 0CK104CK56A 0603B104K500CT 100nF 10 50V C714 0CK104CK56A 0603B104K500CT 100nF 10 50...

Page 23: ...10OHM 5 1 10W R710 0RJ0102D677 MCR03EZPJ100 10OHM 5 1 10W R711 0RJ4700D677 MCR03EZPJ471 470OHM 5 1 10W R712 0RJ0102D677 MCR03EZPJ100 10OHM 5 1 10W R713 0RJ0102D677 MCR03EZPJ100 10OHM 5 1 10W R714 0RJ1001D677 MCR03EZPJ102 1KOHM 5 1 10W R715 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W R716 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R717 0RJ0332D677 MCR03EZPJ330 33OHM 5 1 10W R719 0RJ4701D677 MCR03EZPJ472 4 ...

Page 24: ...SCHEMATIC DIAGRAM 24 1 SCALER ...

Page 25: ... 25 2 POWER ...

Page 26: ... 26 3 WAFER ...

Page 27: ...Aug 2006 P NO MFL34519502 Printed in China ...

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