LG L1750SQ-SN Service Manual
LG L1750SQ-SN Manual
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LG L1750SQ-SN manual content summary:
- LG L1750SQ-SN | Service Manual - Page 1
mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-82 MODEL: L1750SQ-SN (L1750SQ-SNN.AN**QP) L1750SQ-BN (L1750SQ-BNN.AN**QP) L1750SQ-WN (L1750SQ-WNN.AN**QP) ( ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS - LG L1750SQ-SN | Service Manual - Page 2
Blank Page1 龙泉现代YDW资料收藏 - LG L1750SQ-SN | Service Manual - Page 3
SERVICE OSD ...13 TROUBLESHOOTING GUIDE ...14 WIRING DIAGRAM ...18 EXPLODED VIEW...19 REPLACEMENT PARTS LIST ...21 SCHEMATIC DIAGRAM ...23 SPECIFICATIONS 1. LCD CHARACTERISTICS Type : TFT Color LCD Module Active Display Area : 17 389.2 mm (15.32'') 4. Max. Resolution D-sub Analog : 1280 x 1024@75Hz - LG L1750SQ-SN | Service Manual - Page 4
FOR THE SAFETY-RELATED COMPONENT. • There are some special components used in LCD monitor that are important for safety. These parts are marked on the schematic diagram CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. -3- 龙泉现代YDW资料收藏 - LG L1750SQ-SN | Service Manual - Page 5
or any of its assemblies. 5. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to -static type solder removal device. Some solder removal devices not classified as "antistatic" can generate electrical charges sufficient to damage ES - LG L1750SQ-SN | Service Manual - Page 6
General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500。 F to 600。 F. 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead. 3. Keep the - LG L1750SQ-SN | Service Manual - Page 7
Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this - LG L1750SQ-SN | Service Manual - Page 8
60 54 35 48 33 120 16 88 23 160 21 224 39 160 29 176 28 144 39 200 31 248 38 248 38 Resolution 640 x 350 720 X 400 640 x 480 640 x 480 800 x 600 800 x 600 832 x 624 1024 x 768 1024 x 768 1152 x 870 1152 x 900 1280 x 1024 1280 - LG L1750SQ-SN | Service Manual - Page 9
DISASSEMBLY #1 #2 Disassembly Hinge Cover. Remove the screws. #3 #4 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Disassemble back cover. #5 #6 Remove the 6 screws from each up of metal frame. Pell off Al-tape from panel. #7 #8 - LG L1750SQ-SN | Service Manual - Page 10
5V LCD Module 5V 3.3V R,G,B differential 3.3V Reg. 78D33 TSU16AL & TR(KTA1273) 1.8V 1.8V LVDS (Low Voltage Differential Signaling) 3.3V TSU16AL including (ADC/LVDS/SCALER /INPUT SWITCHING / - LG L1750SQ-SN | Service Manual - Page 11
gets the video signal 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 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 - LG L1750SQ-SN | Service Manual - Page 12
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 achive the dc output stablize, and also the over power protection is also monitor by this part. 5. Photo-Coupler isolation. This part function is to - LG L1750SQ-SN | Service Manual - Page 13
EDID V1.0 User Manual Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don't need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. 1. Port Setup a) Copy "UserPort.sys" file to "c:\WINNT\system32\drivers" folder b) Run Userport.exe - LG L1750SQ-SN | Service Manual - Page 14
SERVICE OSD 1) Turn off the power switch at the front side of the 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 - LG L1750SQ-SN | Service Manual - Page 15
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 VOLTAGE PIN5, PIN6 (5V)? YES CHECK U501 PIN 8 Voltage (5V) ? YES CHECK KEY CONTROL CONNECTOR ROUTINE - LG L1750SQ-SN | Service Manual - Page 16
? YES NO CHECK POWER BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK MICOM INV ON/OFF PORT. NO 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL. (CONTACT PROBE TO CAUTION LABEL. CAN YOU SEE PULSE - LG L1750SQ-SN | Service Manual - Page 17
IS NOT DISPLAYED) - MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 PIN 18, 90 3.3V? YES U201 PIN96, 97 OSCILLATE AS 12MHZ? YES NO CHECK U801 (17", 19") CHECK U803 (15") NO 1 1. CHECK PIN122, 123 SOLDERING CONDITION 2. CHECK X501 3. TROUBLE IN U201 2 U501 PIN43 IS 48KHz H-SYNC? PIN44 IS 60Hz - LG L1750SQ-SN | Service Manual - Page 18
4. TROUBLE IN DPM TROUBLE IN DPM 3 CHECK R216, R217 R778, R781 YES NO CHECK PC PC IS NOT GOING INTO DPM OFF MODE CHECK U501 PIN 43.44 SYNC PULSE ? NO CHECK H/V SYNC LINE YES TROUBLE IN U501 Waveforms 3 R216, R778 H-Sync 3 R217, R781 V-Sync - 17 - 龙泉现代YDW资料收藏 - LG L1750SQ-SN | Service Manual - Page 19
WIRING DIAGRAM Connector Ass'y P/N: 6631T11012W or 6631T11020W Connector Ass'y P/N: 6631T20034M or 6631T20023A Connector Ass'y P/N: 6631T11017X - 18 - 龙泉现代YDW资料收藏 - LG L1750SQ-SN | Service Manual - Page 20
010 020 070 080 090 100 030 EXPLODED VIEW - 19 - 龙泉现代YDW资料收藏 040 050 060 110 - LG L1750SQ-SN | Service Manual - Page 21
BRAND L122 BLACK ABS350 9930 TCO99 8MS CABINET ASSEMBLY, L1750SQ BRAND L122 WHITE ABS TCO03 8MS JP-VER LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K4 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,TI S D-IC,SXGA,LVDS LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K3 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE - LG L1750SQ-SN | Service Manual - Page 22
REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE : S SAFETY Mark AL ALTERNATIVE PARTS *S *AL LOC. NO. PART NO. DATE: 2005. 03. 15. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. D702 D706 ZD701 ZD702 ZD703 - LG L1750SQ-SN | Service Manual - Page 23
*S *AL LOC. NO. R543 R544 R545 R547 R548 R549 R555 R557 R560 R701 R702 R703 R704 R706 R708 R709 R712 R716 R717 R720 R722 R723 R724 R726 R727 R737 R744 R747 R751 R752 R753 R754 R755 R769 R778 R781 R803 R804 R805 R806 R808 R816 R820 R821 R824 R825 PART NO. 0RJ4701D677 0RJ4701D677 0RJ4700D677 - LG L1750SQ-SN | Service Manual - Page 24
3 1 Waveforms 1 U201-#96, 97 3 R216, R778 H-Sync 3 R217, R781 V-Sync 龙泉现代YDW资料收藏 SCHEMATIC DIAGRAM 1. TSU56AL / TSU16AL - 23 - - LG L1750SQ-SN | Service Manual - Page 25
2 Waveforms 2 U501-#43 H-SYNC 2 U501-#44 V-SYNC 龙泉现代YDW资料收藏 2. MICOM - 24 - - LG L1750SQ-SN | Service Manual - Page 26
3.POWER - 25 - 龙泉现代YDW资料收藏 - LG L1750SQ-SN | Service Manual - Page 27
3 Waveforms 3 R216, R778 H-Sync 3 R217, R781 V-Sync 龙泉现代YDW资料收藏 4. CONNECTOR & JACKS - 26 - - LG L1750SQ-SN | Service Manual - Page 28
P/NO : 3828TSL094K Mar. 2005 Printed in Korea 龙泉现代YDW资料收藏
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COLOR MONITOR
SERVICE MANUAL
Website:http://biz.LGservice.com
CAUTION
BEFORE SERVICING THE UNIT,
READ THE
SAFETY PRECAUTIONS
IN THIS MANUAL.
CHASSIS NO. : CL-82
MODEL:
L1750SQ-SN
(L1750SQ-SNN.AN**QP)
L1750SQ-BN
(L1750SQ-BNN.AN**QP)
L1750SQ-WN
(L1750SQ-WNN.AN**QP)
(
) **Same model for Service
*To apply the
MSTAR Chip
.
龙泉现代YDW资料收藏