LG L1750SQ-SN Service Manual - Page 17

LG L1750SQ-SN Manual

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3. NO RASTER (OSD 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 V-SYNC? IS PULSE APPEARED AT SIGNAL PINS? AT MODE 12? NO CHECK CONNECTION LINE FROM D-SUB TO U501 YES TROUBLE IN CABLE OR LCD MODULE Waveforms 1 U201-#96, 97 2 U501-#43 H-SYNC 2 U501-#44 V-SYNC - 16 - 龙泉现代YDW资料收藏

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3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR
NO RASTER
(OSD IS NOT DISPLAYED)
NO
NO
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
1
2
Waveforms
U201-#96, 97
U501-#43 H-SYNC
2
U501-#44 V-SYNC
龙泉现代YDW资料收藏