LG Flatron L1552S Service Manual page 18

NO RASTER
(OSD IS NOT DISPLAYED)
PIN 16, 75
1
OSCILLATE AS
PIN27 IS 48KHz H-SYNC?
2
PIN28 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
1
U201-#96, 97
3. NO RASTER (OSD IS NOT DISPLAYED) – Mstar
U201
3.3V?
YES
U201
PIN96, 97
14.31MHZ?
YES
U201
YES
2
U501-#43 H-SYNC
NO
NO
NO
2 U501-#44 V-SYNC
- 15 -
CHECK U801
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
CHECK CONNECTION
LINE FROM D-SUB TO
U201