LG FLATRON L1750G Service Manual Download Page 11 | Manualshive

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DISASSEMBLY

Disassembly Hinge Cover.

Disassemble back cover.

# 1

Remove the screws.

Pell off Al-tape from panel.

Remove the 6 screws from each up of metal frame.

# 2

# 3

# 4

# 5

# 6

Remove Al-tape from control pcb fix.

Remove the 4 screws from each side of metal
frame

1. Pull the front cover upward.
2. Then, let the all latches are separated.
3. Put the front face down.

# 7

# 8

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Summary of Contents for FLATRON L1750G

Page 1: ...8 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 12 21 L1750G S G NN L1950G S G NN LG 3828TSL093Z KIM J O 05 12 21 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 P...

Page 2: ...t Pagination sheet P NO 3828TSL093Z 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: ...www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CL 82 MODEL L1750G L1750G SNN AN QP L1750G L1750G GNN AN QP L1950G L1950G SNN AN QP L1950G L1950G GNN AN QP Same model for Service To apply the MSTAR Chip ...

Page 4: ...Blank Page1 ...

Page 5: ...0 Typ L1950G 3 SIGNAL Refer to the Timing Chart 3 1 Sync Signal Type Separate Sync SOG 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 71 V a Color 0 0 0 Vp p b Color 7 0 0 467 Vp p c Color 15 0 0 714 Vp p 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal 30 83kHz Vertical 56 75Hz 4 Max Resolution D sub Analog 1280 x 1024 75Hz 5 POWER SUPPLY 5 1 Power AC 100 240V 50 60Hz 1 0...

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: ...8 600 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 68 681 1456 1152 32 128 144 1152 x 870...

Page 11: ...crews Pell off Al tape from panel Remove the 6 screws from each up of metal frame 2 3 4 5 6 Remove Al tape from control pcb fix Remove the 4 screws from each side of metal frame 1 Pull the front cover upward 2 Then let the all latches are separated 3 Put the front face down 7 8 ...

Page 12: ... LVDS SCALER INPUT SWITCHING TMDS MTV312 MICOM LCD Module R G B differential LIPS 5V 5V TSU16AL TR KTA1273 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 AC Input BLOCK DIAGRAM ...

Page 13: ...puts 8 bit R G B signal to transmitter 2 Power 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 12V is provided for LCD panel and 5V for micom 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 700Vrms and operates...

Page 14: ...gh a bridge rectifier and a bulk capacitor 3 Energy Transfer This part function is 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 achive the dc output st...

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: ...ECK 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 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: ... NO TROUBLE IN CABLE OR LCD MODULE CHECK U801 17 19 CHECK 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 ...

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 6631T11017X L1750G 6631T11017Y L1950G 6631T20034M or 6631T20023A 6631T11012W ...

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

Page 23: ...SXGA or 6304FLP279A LCD LIQUID CRYSTAL DISPLAY LM170E01 TLA2 LG PHILPS TFT COLOR P6 645CH 250NITS 8MS LPL NJ KUMI PB FREE EGI OKI S D IC SXGA LVDS or 6304FLP280A LCD LIQUID CRYSTAL DISPLAY LM170E01 TLA4 LG PHILPS TFT COLOR P6 645CH 250NITS 8MS LPL NJ KUMI PB FREE EGI MAGNA S D IC EGI SXGA 6304FLP142A LCD LIQUID CRYSTAL DISPLAY LM190E03 B4K1 LG PHILPS TFT COLOR 20T TN 250NITS SXGA LVDS or 6304FLP18...

Page 24: ...10V 10 R TP X7R L1950G C818 0CC102CK41A 1000PF 1608 50V 5 R TP NP0 L1950G C819 0CK105CD56A 1UF 1608 10V 10 R TP X7R DATE 2005 11 30 S AL LOC NO PART NO DESCRIPTION SPECIFICATION D701 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R D702 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R D706 0DSIH00018A ENKMC2837 T112 LF ISAHAYA R ZD701 0DZ560009GB BZT52C5V6S F LF DIODES R T ZD702 0DZ560009GB BZT52C5V6S F LF DIODES R...

Page 25: ...TP R751 0RJ4700D677 470 OHM 1 10 W 5 1608 R TP R752 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R753 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R754 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R755 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R769 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R778 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R781 0RJ0682D677 68 OHM 1 10 W 5 1608 R TP R803 0RH0000D622 0 OHM 1 10 W 2012 5 00 D R804 0R...

Page 26: ...SCHEMATIC DIAGRAM 23 1 TSU56AL TSU16AL L1750S L1950S TSU56AL TSU16AL 1 1 Waveforms U201 96 97 3 R216 R778 H Sync 3 R217 R781 V Sync 1 3 ...

Page 27: ... 24 2 MICOM L1750S L1950S MICOM 2 2 U501 43 H SYNC 2 U501 44 V SYNC Waveforms 2 ...

Page 28: ... 25 3 POWER L1750S L1950S POWER 3 ...

Page 29: ... 26 4 CONNECTOR JACKS L1750S L1950S CONNECTOR JACKS 4 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync 3 ...

Page 30: ...Nov 2005 P NO 3828TSL093Z Printed in Korea ...

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