LG L1900J Service Manual Download Page 1

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COLOR MONITOR

SERVICE MANUAL

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:

L1900J (L1900J-BFQ.A**TNP)

*To apply the MSTAR Chip.

( ) **Same model for Service

Summary of Contents for L1900J

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 LM62A MODEL L1900J L1900J BFQ A TNP To apply the MSTAR Chip Same model for Service ...

Page 2: ...ertical 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 SWIVEL Width 416 5 mm 16 40 Depth 148 4 ...

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: ...sassembly Stand Top Cover with Jig jig P No 3911900036A Remove the tape and screws 1 Disassembly Rubber and Remove the screws 2 Disassembly Stand Cover Remove the screw 5 Remove the screw let the all latches are separated 6 1 6 4 ...

Page 9: ... 9 6 2 1 Put the front face down 2 Let the all latches are separated 6 4 6 3 Disassemble back cover 7 6 1 ...

Page 10: ...EEPROM Digital DVI D Digital Signal TMDS TSUMO56HJ Mstar ACE LVDS Tx OSD 3 3V Flash ROM EEPROM SYSTEM 1 8V 3 3V LVDS Vcc 5V Panel LED Control Key Line Buffer Scaler SSC ADC TMDS Rx MCU Intel8032 3 3V D D converter 12V 5V Power Sub 1 8v Regulator 3 3V 3 3V 1 8V 5V 5V 5V 5V LED LED LED LED LED LED Inverter ...

Page 11: ...l converted analog 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 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 MICOM Part This ...

Page 12: ... 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 achie...

Page 13: ... 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 14: ... E L V S Y N C P O W E R S T VGS MONITOR E E V Sync On Off Switch Switch must be ON F F A A B B C C 15 10 5 5 6 9 1 1 1 14 13 25 6 5V 5V 5V 4 7K 4 7K 4 7K 74LS06 74LS06 OFF ON OFF ON 11 1 2 3 1 LPT port Seting Select the Computer LPT Port 2 Jig to use Select Using the JIG 3 ABUS Commander Enter the Adjust and Select the Send CMD Reference the adjust table Service OSD Adjust Table CMD D1 D2 SERVICE...

Page 15: ...OINT AS OPENING EACH POWER LINE NO PROBLEM 1 Waveforms IC101 127 CHECK KEY CONTROL CONNECTOR ROUTINE CHECK IC201 NO NO CHECK 3 3V LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES CHECK P303 VOLTAGE PIN1 12V CHECK IC102 PIN 8 VOLTAGE 3 3V IS IC101 PIN8 3 3V VOLTAGE CHECK IC101 PIN 127 PULSE 1 YES YES YES ...

Page 16: ...AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK MICOM INV ON OFF PORT 1 CONFIRM BRIGHTNESS OSD CONTRL STATE 2 CHECK MICOM DIM ADJ PORT INVERTER P304 PIN1 PIN2 12V P304 PIN7 5V P304 PIN6 PWM WAVEFORM 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 17: ...K C109 C110 SOLDERING CONDITION 2 CHECK X101 3 TROUBLE IN IC101 CHECK CONNECTION LINE FROM D SUB TO IC101 IC101 PIN127 128 OSCILLATE AS 14 31MHZ IC101 PIN32 IS 48KHz H SYNC PIN33 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms IC101 127 128 IC101 32 H SYNC 2 IC101 33 V SYNC YES YES YES IC101 PIN 7 8 3 3V ...

Page 18: ...OUBLE 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 R307 R308 CHECK IC101 PIN 32 33 SYNC PULSE 3 3 Waveforms R307 H Sync 3 R308 V Sync YES YES ...

Page 19: ... 19 WIRING DIAGRAM 6631900080A 30P 3P 6P 7P 6631900017F 6631T12006F 6631T12006E ...

Page 20: ... 20 EXPLODED VIEW 010 020 080 110 120 090 130 140 040 050 060 070 030 100 150 ...

Page 21: ...O12 5V 800V 7 3A 4 YES PWM DIMMING 19INCH PB FREE 68719STA96A PCB Assembly SUB T T LM62A L1900 E TYPE 68719STA96B PCB Assembly Sub SUB T T LM62A L1900E KXXNTPS POWER KEY CKD FOR LGESP For Only Brazil 68719STA94A PCB Assembly SUB T T LM62A L1900 J TYPE 68719STA94B PCB Assembly Sub SUB T T LM62A L1900J KXXTNPS LED ASS Y CKD For Only Brazil AGU30056601 Plate Assembly ASSY MAIN FRAME ASSY_R J_TYPE AGU...

Page 22: ...2CK56A 0603B102K500CT 1nF 10 50V X DATE 2006 08 25 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C216 0CK102CK56A 0603B102K500CT 1nF 10 50V X C217 0CK102CK56A 0603B102K500CT 1nF 10 50V X C218 0CK105CD56A C1608X7R1A105KT 1uF 10 10V C219 0CC101CK41A C1608C0G1H101JT 100pF 5 50V C220 0CC102CK41A C1608C0G1H102JT 1nF 5 50V C C221 0CC102CK41A C1608C0G1H102JT 1nF 5 50V C C222 0CK103CK51A 0603B103K500CT 10...

Page 23: ...ECIFICATION R203 0RJ4702D477 MCR03EZPF473 47KOHM 1 1 10W R205 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10 R206 0RJ0000D677 MCR03EZPJ000 0OHM 5 1 10W 1 R207 0RJ4701D677 MCR03EZPJ472 4 7KOHM 5 1 10 R208 0RJ4702D677 MCR03EZPJ473 47KOHM 5 1 10W R209 0RJ1000D677 MCR03EZPJ101 100OHM 5 1 10W R210 0RJ2202D677 MCR03EZPJ223 22KOHM 5 1 10W R211 0RJ2202D677 MCR03EZPJ223 22KOHM 5 1 10W R212 0RJ5600D677 MCR03EZPJ56...

Page 24: ...02D677 MCR03EZPJ103 10KOHM 5 1 10W R604 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W R605 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W R606 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W R607 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W R609 0RJ6803D677 MCR03EZPJ684 680KOHM 5 1 10 R610 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W R611 0RJ3900D677 MCR03EZPJ391 390OHM 5 1 10W ZD1 0DZ560009DA UDZS5 6B 5 6V 5 49TO5 73V 60 C702 ...

Page 25: ...SCHEMATIC DIAGRAM 25 1 SCALER ...

Page 26: ... 26 2 POWER ...

Page 27: ... 27 3 CONNECTOR ...

Page 28: ... 28 4 J Type LED ...

Page 29: ... 29 5 POWER ...

Page 30: ... 30 6 LED Bright control ...

Page 31: ...Aug 2006 P NO MFL30105548 Printed in Korea ...

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