LG Flatron L1510M Service Manual page 13

3. NO RASTER (OSD IS NOT DISPLAYED) – gmZAN2
NO RASTER
(OSD IS NOT DISPLAYED)
U201
POWER PINS
3.3V?
YES
U201 PIN141, 142
OSCILLATE AS 20MHz?
YES
U401
PIN31 IS 65MHz CLOCK?
PIN27 IS 48KHz H-SYNC?
PIN28 IS 60Hz V-SYNC?
PIN30 IS 48KHz DEN?
IS PULSE APPEARED
AT SIGNAL PINS?
YES
U401 PIN1
3.3V?
YES
TROUBLE IN CABLE
OR LCD MODULE
NO
1. CHECK PIN141, 142
NO
2. CHECK X201
3. TROUBLE IN U201
NO
CHECK CONNECTION LINE
FROM U201 TO U401
NO
CHECK U802, U806
SOLDERING CONDITION
CHECK U802