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LG L2000C - - 20.1" LCD Monitor, Service Manual, Page: 16 / 23

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LG L2000C - - 20.1

- 16 -

3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR

NO RASTER

(OSD IS NOT DISPLAYED)

NO

NO

NO

TROUBLE IN CABLE 

OR LCD MODULE

CHECK U501

1. CHECK C110, C109

SOLDERING CONDITION

2. CHECK X101
3. TROUBLE IN U101

CHECK CONNECTION LINE
FROM D-SUB  TO U101 

U101 

PIN127, 128

OSCILLATE AS

14.31MHZ?

U101

PIN32 IS 48KHz H-SYNC?

PIN33 IS 60Hz V-SYNC?

IS PULSE APPEARED 

AT SIGNAL PINS?

AT MODE 12?

1

2

1

2

Waveforms

U101-#127, 128

U101-#32 H-SYNC

2

U101-#33 V-SYNC

YES

YES

YES

U101

PIN 71, 87

3.3V?

Summary of Contents for L2000C - - 20.1" LCD Monitor

Page 1: ...UAL Website 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 LM62A MODEL L1970HR L1970HR BFR A RQP Same model for Service ...

Page 2: ...30 83kHz Horizontal Digital 30 71kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz Digital 1280 x 1024 60Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 0 6A 5 2 Power Consumption 6 ENVIRONMENT 6 1 Operating Temperature 10 C 35 C 50 F 95 F Ambient 6 2 Relative Humidity 10 80 Non condensing 6 3 MTBF 50 000 HRS with 90 Confidence Lamp Life 50 000 Hours Min 7 DIMENSIONS with TILT SW...

Page 3: ... Protect the 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 pl...

Page 4: ...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 5: ...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 6: ...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 7: ...128 88 800 x 600 V Lines 60 317 628 600 1 4 23 6 H Pixels 49 5 46 875 1056 800 16 80 160 800 x 600 V Lines 75 0 625 600 1 3 21 7 H Pixels 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 55 667 624 1 3 39 8 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 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 6...

Page 8: ... Hinge Cover Remove the screws 1 Remove the screws 1 Disassemble Control PCB 2 Put the front face down 1 Pull the front cover upward 2 Then let the all latches are separated 2 3 4 5 6 Disassemble back cover Pull out the cable 7 ...

Page 9: ...UT SWITCHING TMDS MICOM ODC M25P10 flash memory LCD Module LVDS Low Voltage Differential Signaling 5V 1 8V Reg LD1117S18 DVI D R G B H V Sync Digital Signal 1 8V 3 3V 1 8V 3 3V 3 3V Reg 78D33 5V 3 3V MP1583DN 12V 5V Power Inverter Adapter 12V Inverter Control 3 3V ...

Page 10: ...alog to digital interpolates input to 1280 X 1024 resolution signal and outputs 8 bit R G B signal to transmitter 2 Power Part This part consists of the 3 3V regulator to convert power which is provided 12V 5V in Power board and Micom 5V is provided for LCD panel Also 5V is converted 3 3V by regulator and 3 3V is converted 1 8V by regulator Converted power is provided for IC in the main board 3 MI...

Page 11: ...C voltage through 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 achi...

Page 12: ... is available to 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 13: ...display 2 Wait for about 5 seconds and press MENU POWER switch with 1 second interval 3 The SVC OSD menu contains additional menus that the User OSD menu as described below a Auto Color W B balance and Automatically sets the gain and offset value b NVRAM INIT EEPROM initialize 24C08 c CLEAR ETI To initialize using time d AGING Select Aging mode on off e R G B 9300K Allows you to set the R G B 9300...

Page 14: ...T WITH ANOTHER ONE 1 Waveforms U101 127 CHECK U101 AND U102 NO NO CHECK U503 AND AROUND CIRCUIT CHECK U501 NO CHECK U502 YES CHECK J406 VOLTAGE PIN 1 12V CHECK U503 PIN 5 VOLTAGE 5V IS U501 PIN3 3 3V VOLTAGE IS U502 PIN2 1 8V VOLTAGE NO CHECK X TAL CHECK U101 PIN 127 PULSE 1 YES YES YES YES ...

Page 15: ...12V LINE AND FIND OUT A OPEN POINT AS OPENING EACH POWER LINE CHECK MICOM INV ON OFF PORT CHECK SCALER DIM ADJ PORT REPLACE INVERTER AND RECHECK J403 PIN1 PIN2 12V J403 PIN7 3 3V J403 PIN6 AND PULSE CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE YES YES YES YES ...

Page 16: ...ECK C110 C109 SOLDERING CONDITION 2 CHECK X101 3 TROUBLE IN U101 CHECK CONNECTION LINE FROM D SUB TO U101 U101 PIN127 128 OSCILLATE AS 14 31MHZ U101 PIN32 IS 48KHz H SYNC PIN33 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U101 127 128 U101 32 H SYNC 2 U101 33 V SYNC YES YES YES U101 PIN 71 87 3 3V ...

Page 17: ...ROUBLE IN DPM TROUBLE IN DPM NO NO TROUBLE IN U101 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE CHECK R458 R459 CHECK U101 PIN 32 33 SYNC PULSE 3 3 Waveforms R458 H Sync 3 R459 V Sync YES YES ...

Page 18: ... 18 WIRING DIAGRAM 6631T12006F 6631T12006L 6631900080A 30P 7P 6P ...

Page 19: ... 19 EXPLODED VIEW 010 020 060 070 080 090 100 030 110 050 040 ...

Page 20: ...SCHEMATIC DIAGRAM 23 1 SCALER ...

Page 21: ... 24 2 POWER WAFER ...

Page 22: ... 25 3 DC DC BLOCK ...

Page 23: ...Jun 2006 P NO 38289S0041 Printed in Korea ...

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