LG Flatron L1511S Service Manual page 12

3. NO RASTER (OSD IS NOT DISPLAYED) – MST9011
NO RASTER
(OSD IS NOT DISPLAYED)
U201
POWER PINS
3.3V?
YES
U201
PIN122, 123
OSCILLATE AS
12MHZ?
YES
U501
PIN41 IS 48KHz H-SYNC?
PIN42 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
YES
U501 PIN8
5V?
YES
TROUBLE IN CABLE
OR LCD MODULE
NO
NO
NO
NO
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CHECK U803, U801
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U201
CHECK CONNECTION LINE
FROM U201 TO U501
CHECK 5VR LINE