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LG FLATRON L1740BQ, Service Manual

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LG FLATRON L1740BQ Service Manual Download Page 3

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. : 

CL-82

MODEL:                     L1740BQ 

(L1740BQN.AN**EP)

(      ) **Same model for Service

*To apply the MSTAR Chip.

Summary of Contents for FLATRON L1740BQ

Page 1: ...mber of pages 28 Including blank 1page Part No 1 2 Service Guide Specification Service Guide Specification Changes 4 REV NO MM DD YY SIGNATURE CHANGE NO CHANGE CONTENTS 1 2 3 4 5 7 6 SUFFIX LEE H J 05 03 18 L1740BQN LG 3828TSL094M KIM J O 05 03 18 1 Origin Notification LGEDI Printed in Indonesia LGEWA Printed in U K LGESP Printed in Brazil LGEMX Printed in Mexico LGENT Printed in China LGEIL Print...

Page 2: ...t Pagination sheet P NO 3828TSL094M Total pages 28pages Cover English 2 English 3 English 4 English English Rear Cover Front cover Inside blank English English 22 English 23 English 24 English 25 Rear cover Inside 26 ...

Page 3: ... 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 CL 82 MODEL L1740BQ L1740BQN AN EP Same model for Service To apply the MSTAR Chip ...

Page 4: ...Blank Page1 ...

Page 5: ...nce 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 1 0A 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 level Lamp Life 50 000 Hours Min 7 DIMENSIONS with TILT SWIVEL Widt...

Page 6: ...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 7: ...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 8: ...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 9: ...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 10: ... 5 H Pixels 40 0 37 879 1056 800 40 128 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 8...

Page 11: ...Disassemble inverter shield something thin Disassemble back cover 2 3 4 5 6 Remove the 7 screws from each side of metal frame Remove the 4 screws from each side of metal frame 1 Open the Backcover s latch with special Jig 2 Refer to right picture which shows the latches Jig 7 8 1 2 3 4 9 10 11 12 14 13 8 7 6 5 ...

Page 12: ...LVDS SCALER INPUT SWITCHING TMDS MTV412 MICOM LCD Module R G B differential LIPS 5V 5V AC I nput FE2040 TR KTA 1273 12V R G B H V Sync 1 8V 3 3V 1 8V 3 3V 3 3V Reg 78D33 5V 3 3V LVDS Low Voltage Differential Signaling BLOCK DIAGRAM ...

Page 13: ...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 5V in power board 5V is provided for LCD panel Micom Also 5V is converted 3 3V by regulator and 3 3V is converted 1 8V by scaler KTA1273 Converted power is provided for IC in the main board 3 MIC...

Page 14: ... 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 output s...

Page 15: ... 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 16: ...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 17: ...K U201 NO NO NO CHECK POWER BOARD AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK 5VS LINE OPEN CHECK CHECK 3 3V LINE NO CHECK X TAL YES YES YES YES YES CHECK J705 VOLTAGE PIN5 PIN6 5V CHECK U501 PIN 8 VOLTAGE 5V IS U201 PIN90 3 3V VOLTAGE CHECK U201 PIN 96 PULSE 1 NO PROBLEM 1 Waveforms U201 96 ...

Page 18: ...ARD 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 LIPS YES YES YES YES J705 PIN5 PIN6 5V J705 PIN9 2 5V J705 PIN10 5V CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL CONTACT PROBE TO CAUTION LABEL CAN YOU SEE PULSE AT YOUR SCOPE ...

Page 19: ... U803 15 1 CHECK PIN122 123 SOLDERING CONDITION 2 CHECK X501 3 TROUBLE IN U201 CHECK CONNECTION LINE FROM D SUB TO U501 YES YES YES U201 PIN 18 90 3 3V U201 PIN96 97 OSCILLATE AS 12MHZ U501 PIN43 IS 48KHz H SYNC PIN44 IS 60Hz V SYNC IS PULSE APPEARED AT SIGNAL PINS AT MODE 12 1 2 1 2 Waveforms U201 96 97 U501 43 H SYNC 2 U501 44 V SYNC ...

Page 20: ...DPM TROUBLE IN DPM NO NO TROUBLE IN U501 CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK H V SYNC LINE YES YES CHECK R216 R217 R778 R781 CHECK U501 PIN 43 44 SYNC PULSE 3 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync ...

Page 21: ... 18 WIRING DIAGRAM Connector Ass y P N 6631T11012W or 6631T11020W Connector Ass y P N 6631T20023A Connector Ass y P N 6631T2006H Connector Ass y P N 6631T2006J ...

Page 22: ... 19 010 020 030 100 040 080 070 090 050 130 110 120 060 EXPLODED VIEW ...

Page 23: ...A 3809TKL103K BACK COVER ASSEMBLY L1740BN 102A 103B WA LOCAL C SKD EUROPE 3043TKK219K TILT SWIVEL ASSEMBLY L1740 219B LABEL 3043TKK219L TILT SWIVEL ASSEMBLY L1740 219C B C SKD LABEL CHINA RUSSIA 3043TKK219G TILT SWIVEL ASSEMBLY L1740 219B WA LOCAL C SKD EUROPE 6871TPT282C PWB PCB ASSEMBLY POWER M CHASSIS 1720 DOCKING 2PIN 450V POWER TOTAL LIEN CHANG PB FREE 3313TL7095A MAIN TOTAL ASSEMBLY L1740BN ...

Page 24: ...CK105CD56A 1UF 1608 10V 10 R TP X7R D701 0DS226009AA KDS226 TP KEC 80V 4NSE DATE 2005 03 15 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D702 0DS226009AA KDS226 TP KEC 80V 4NSE D706 0DS226009AA KDS226 TP KEC 80V 4NSE ZD701 0DZ560009GB BZT52C5V6S F LF DIODES R T ZD702 0DZ560009GB BZT52C5V6S F LF DIODES R T ZD703 0DZ560009GB BZT52C5V6S F LF DIODES R T ZD704 0DZ560009GB BZT52C5V6S F LF DIODES R T ZD...

Page 25: ... 1 10 W 2012 5 00 D R804 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R805 0RH2000D622 200 OHM 1 10 W 5 D R TP R806 0RH2000D622 200 OHM 1 10 W 5 D R TP R808 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R816 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R820 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R821 0RH0000D622 0 OHM 1 10 W 2012 5 00 D R824 0RJ0272D677 27 OHM 1 10 W 5 1608 R TP R825 0RJ2000D677 200 OHM 1 10 W 5 1608 R ...

Page 26: ...SCHEMATIC DIAGRAM 23 1 FE2030 FE2040 U201 FE2030 FE2040 1 Waveforms U201 96 97 3 R216 R778 H Sync 3 R217 R781 V Sync 1 3 ...

Page 27: ... 24 2 MICOM U501 MTV41 2PL CC 2 U501 43 H SYNC 2 U501 44 V SYNC Waveforms 2 ...

Page 28: ... 25 3 POWER ...

Page 29: ... 26 4 CONNECTOR JACKS ...

Page 30: ...Mar 2005 P NO 3828TSL094M Printed in Korea ...

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