LG FLATRON L1520BM-AL*R Service Manual page 16

3. NO RASTER (OSD IS NOT DISPLAYED) – MST9011B
NO RASTER
(OSD IS NOT DISPLAYED)
U201
POWER PIN8, 114
3.3V?
YES
U201
PIN122, 123
OSCILLATE AS
12MHZ?
YES
U501
PIN43 IS 48KHz H-SYNC?
PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
YES
TROUBLE IN CABLE
OR LCD MODULE
NO
NO
NO
- 13 -
CHECK U801
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U201
CHECK CONNECTION LINE
FROM D-SUB TO U501