LG Flatron L1552S

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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
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
CHECK CONNECTION
LINE FROM D-SUB TO
U201
YES
YES
YES
U201
PIN 16, 75
3.3V?
U201
PIN96, 97
OSCILLATE AS
14.31MHZ?
U201
PIN27 IS 48KHz H-SYNC?
PIN28 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