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LG FLATRONL194WT, Service Manual

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LG FLATRONL194WT 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

1. CONFIRM BRIGHTNESS

OSD CONTRL STATUS

2. CHECK MICOM DIM-ADJ 

PORT

CHECK P702 

PIN10

POWER BOARD (LIPS)

CHECK 

PULSE AS 

CONTACTING PROBE 

TO THE LAMP 

WIRE OF THE 
LCD MODULE

REPLACE LCD MODULE

YES

1

2

3

YES

YES

YES

Waveforms

1

P702-#5,6

2

P702-#10

3

LAMP CURRENT

Summary of Contents for FLATRONL194WT

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 LM57G MODEL L194WT L194WT SFQ A RQF L194WT L194WT BFQ A RQF Same model for Service ...

Page 2: ...e 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 50 75Hz 4 MAX RESOLUTION Analog 1440 x 900 75Hz Digital 1440 x 900 60Hz 5 POWER SUPPLY 5 1 Power Adaptor Built in Power Input AC 100 240V 50 60Hz 1 2A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Oper...

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: ... V Lines 60 0 806 768 3 6 29 9 H Pixels 78 75 60 123 1312 1024 16 96 176 1024 x 768 V Lines 75 029 800 768 1 3 28 10 H Pixels 100 0 68 681 1456 1152 32 128 144 1152 x 870 V Lines 75 062 915 870 3 3 39 11 H Pixels 92 978 61 805 1504 1152 18 134 200 1152 x 900 V Lines 65 96 937 900 2 4 31 12 H Pixels 108 0 63 981 1688 1280 48 112 248 1280 x 1024 V Lines 60 02 1066 1024 1 3 38 13 H Pixels 135 0 79 97...

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 YES 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 ...

Page 16: ...D CHECK POWER BOARD LIPS CHECK P702 VOLTAGE PIN5 6 5V NO NO NO NO 1 CONFIRM BRIGHTNESS OSD CONTRL STATUS 2 CHECK MICOM DIM ADJ PORT CHECK P702 PIN10 POWER BOARD LIPS CHECK PULSE AS CONTACTING PROBE TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE YES 1 2 3 YES YES YES Waveforms 1 P702 5 6 2 P702 10 3 LAMP CURRENT ...

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 4 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 6631900109A 6631T20023J EAD30368601 30P 6P 11P ...

Page 20: ...EXPLODED VIEW 20 010 020 090 100 110 120 030 040 050 130 080 060 070 ...

Page 21: ...94WT EBU30205103 Main Total Assembly L194WTM BFQ BRAND LM57G 68719PT298A PCB Assembly Power POWER T T LM57A L1752S KNRDQPT TOTAL or 6709900027A SMPS AC DC AIVP 100 0VTO240 0V 40W 50TO60HZ UL CSA VDE SEV SEMKO FIMKO IMQ OVE BSI WORLD WIDE 35509K0247A Cover LX52 PIECE COVER VESA 49509S0034B Plate SHIELD LX52 REAR SHIELD DUAL 49509K0352A Plate SHIELD GUIDE L194W 6410TCW007A Power Cord CCC LSG 31 RVA1...

Page 22: ...08 0CK104CK56A 0603B104K500CT 100nF 10 50V C709 0CK104CK56A 0603B104K500CT 100nF 10 50V C710 0CC680CK41A C1608C0G1H680JT 68pF 5 50V DATE 2006 06 01 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C711 0CC680CK41A C1608C0G1H680JT 68pF 5 50V C712 0CK104CK56A 0603B104K500CT 100nF 10 50V C713 0CK104CK56A 0603B104K500CT 100nF 10 50V C714 0CK104CK56A 0603B104K500CT 100nF 10 50V C715 0CK104CK56A 0603B104K5...

Page 23: ...7 MCR03EZPJ680 68OHM 5 1 10W R727 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R728 0RJ4700D677 MCR03EZPJ471 470OHM 5 1 10W R729 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W DATE 2006 06 01 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R730 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R731 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R732 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10 R733 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5...

Page 24: ...1D622 MCR10EZHJ222 2 2KOHM 5 1 8W R107 0RD8203A609 RDM92T1J820K 820KOHM 5 1 2W R108 0RD4702A609 RDM92T1J47K0 47KOHM 5 1 2W R109 0RX0560J609 RSD01T1JR560 560MOHM 5 1W 9 R110 0RX1003K607 RSD02T3J100K 100KOHM 5 2W 1 R111 0RD0471Q609 RDM94T1J4R70 4 7OHM 5 1 4W R112 0RJ1302E472 MCR10EZHF 1302 13KOHM 1 1 8 R115 0RJ4703G676 MCR18EZHJ474 470KOHM 5 1 4W R116 0RJ4703G676 MCR18EZHJ474 470KOHM 5 1 4W R117 0RH...

Page 25: ...IPTION SPECIFICATION SW1 6600R00004C JTP1127WEM 1C1P 15VDC 0 05A SW2 6600R00004C JTP1127WEM 1C1P 15VDC 0 05A SW3 6600R00004C JTP1127WEM 1C1P 15VDC 0 05A SW4 6600R00004C JTP1127WEM 1C1P 15VDC 0 05A SW5 6600R00004C JTP1127WEM 1C1P 15VDC 0 05A 25 ...

Page 26: ...SCHEMATIC DIAGRAM 26 1 SCALER ...

Page 27: ... 27 2 POWER ...

Page 28: ... 28 3 WAFER ...

Page 29: ...Nov 2006 P NO MFL30105583 Printed in Korea ...

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