LG Flatron L1753 - MSTAR No Raster Troubleshooting

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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 U901
1. CHECK C509, C510
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U501
CHECK CONNECTION
LINE FROM D-SUB TO
U501
U501
PIN127, 128
OSCILLATE AS
14.31MHZ?
U501
PIN32 IS 48KHz H-SYNC?
PIN33 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
1
2
1
2
Waveforms
U201-#96, 97 U101-#27 H-SYNC
2
U101-#28 V-SYNC
YES
YES
YES
U501
PIN 58, 57
3.3V?