LG Flatron L1750H Service Manual Download Page 1

Page: 1 / 28

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-83

MODEL: L1750H

(L1750H-SNN.AN**QP)

L1750H

(L1750H-GNN.AN**QP)

L1950H

(L1950H-SNN.AN**QP)

L1950H

(L1950H-GNN.AN**QP)

( ) **Same model for Service

*To apply the MSTAR Chip.

Summary of Contents for Flatron L1750H

Page 1: ...www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS NO CL 83 MODEL L1750H L1750H SNN AN QP L1750H L1750H GNN AN QP L1950H L1950H SNN AN QP L1950H L1950H GNN AN QP Same model for Service To apply the MSTAR Chip ...

Page 2: ...ng Chart 3 1 Sync Signal Type Separate Sync Digital SOG Sync On Green 3 2 Video Input Signal 1 Type R G B Analog 2 Voltage Level 0 0 7 V a Color 0 0 0 Vp p b Color 7 0 0 35 Vp p c Color 15 0 0 7 Vp p 3 Input Impedance 75 Ω 3 3 Operating Frequency Horizontal Analog 30 83kHz Horizontal Digital 30 71kHz Vertical 56 75Hz 4 MAX RESOLUTION D sub Analog 1280 x 1024 75Hz DVI Digital 1280 x 1024 60Hz 5 POW...

Page 3: ... Sync 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 Connec...

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: ...4 136 160 V 60 0 806 768 3 6 29 H 60 123 1312 1024 16 96 176 V 75 029 800 768 1 3 28 H 68 681 1456 1152 32 128 144 V 75 062 915 870 3 3 39 H 61 805 1504 1152 18 134 200 V 65 96 937 900 2 4 31 H 63 981 1688 1280 48 112 248 V 60 02 1066 1024 1 3 38 H 79 976 1688 1280 16 144 248 V 75 035 1066 1024 1 3 38 Mode H V Sort 1 2 3 4 5 6 7 8 9 10 11 12 13 25 175 28 321 25 175 31 5 40 0 49 5 57 283 65 0 78 75...

Page 9: ...Cover 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 10: ...R INPUT SWITCHING TMDS MTV312 MICOM LCD Module R G B differential LIPS 5V 5V AC I nput TSU56AL TR KTA 1273 12V DVI D R G B H V Sync Digital Signal 1 8V 3 3V 1 8V 3 3V1 3 3V Reg 78D33 5V 3 3V LVDS Low Voltage Differential Signaling BLOCK DIAGRAM ...

Page 11: ...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 5V is provided for MICOM and LCD panel 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 MI...

Page 12: ...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 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: ...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 15: ...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 16: ...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 17: ... 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 18: ...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 19: ... 19 WIRING DIAGRAM Connector Ass y P N 6631T11012W or 6631T11020W Connector Ass y P N 6631T11017X L1750H 6631T11017Y L1950H Connector Ass y P N 6631T20023A or 6631T20034M ...

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

Page 21: ... COVER ASSEMBLY L1750B L100 ABS350 9930 BK 3809TKL100D BACK COVER ASSEMBLY L1750H L100 ABS350 9930 BK B C SKD 3809TKL101B BACK COVER ASSEMBLY L1950B L101 BRAND ABS350 9930 BK 3809TKL101D BACK COVER ASSEMBLY L1950H L101 BRAND ABS350 9930 BK B C SKD 3043TKK190E TILT SWIVEL ASSEMBLY L1750B STAND BODY HF350 9930 HEIGHT 3043TKK190H TILT SWIVEL ASSEMBLY L1750H STAND BODY ABS350 9930 HEIGHT E C SKD 3043T...

Page 22: ...K56A 0 1UF 1608 50V 10 R TP X7R C738 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C743 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R DATE 2005 01 26 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C744 0CC680CK41A 68PF 1608 50V 5 R TP NP0 C803 0CE107EF610 100UF KMG RD 16V 20 FL BULK C805 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R L1750H C809 0CK103CK51A 0 01UF 1608 50V 10 R TP B Y C812 0CE107EF610 100UF KMG RD 16V 2...

Page 23: ...R TP R727 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R728 0RJ0222D677 22 OHM 1 10 W 5 1608 R TP R729 0RJ0222D677 22 OHM 1 10 W 5 1608 R TP R730 0RJ1000D677 100 OHM 1 10 W 5 1608 R TP R731 0RJ4700D677 470 OHM 1 10 W 5 1608 R TP R737 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R744 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R TP R747 0RJ4701D677 4 7K OHM 1 10 W 5 1608 R TP R751 0RJ4700D677 470 OHM 1 10 W 5 1608 R TP D...

Page 24: ...SCHEMATIC DIAGRAM 24 1 TSU56AL TSU16AL 1 Waveforms U201 96 97 3 R216 R778 H Sync 3 R217 R781 V Sync 1 3 ...

Page 25: ... 25 2 MICOM 2 U501 43 H SYNC 2 U501 44 V SYNC Waveforms 2 ...

Page 26: ... 26 3 POWER ...

Page 27: ... 27 4 CONNECTOR JACKS 3 Waveforms R216 R778 H Sync 3 R217 R781 V Sync 3 ...

Page 28: ...Jan 2005 P NO 3828TSL096N Printed in Korea ...

Search results

Summary of Contents for Flatron L1750H

Reviews:

Related manuals for Flatron L1750H

Brands by name

Popular brands

LG Flatron L1750H, Service Manual

Search results

Summary of Contents for Flatron L1750H

Reviews:

Related manuals for Flatron L1750H

Brands by name

Popular brands