LG LB500J Service Manual page 15

3. NO RASTER (OSD IS NOT DISPLAYED) – gmZAN2
NO RASTER
(OSD IS NOT DISPLAYED)
U201
POWER PINS
3.3V?
U201 PIN141, 142
OSCILLATE AS 14.3M?
YES
(AUO Module)
YES
(LG Philips Module
& Hydis Module)
U401/U411
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/U411 PIN1
3.3V?
YES
TROUBLE IN CABLE
OR LCD MODULE
YES
PIN63 IS 65MHz CLOCK?
PIN66 IS 48KHz H-SYNC?
PIN70 IS 60Hz V-SYNC?
PIN69 IS 48KHz DEN?
IS PULSE APPEARED
NO
CHECK CONNECTION LINE
FROM U201 TO U401/U411
NO
J402
AT SIGNAL PINS?
YES
J402 PIN74, PIN1
3.3V?
TROUBLE IN CABLE
OR LCD MODULE
NO
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CHECK U802, U806
1. CHECK PIN141, 142
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
NO
CHECK
CONNECTION LINE
FROM U201 TO J402
NO
CHECK
U805
YES
CHECK U805