Dell 2005FPW - UltraSharp - 20.1" LCD Monitor - Troubleshooting Guide; No Raster or OSD Display (GM1501 CF)

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3. NO RASTER (OSD IS NOT DISPLAYED) – GM1501CF
NO RASTER
(OSD IS NOT DISPLAYED)
NO
NO
NO
TROUBLE IN CABLE
OR LCD MODULE
TROUBLE IN LIPS
1. CHECK G4, G3
SOLDERING CONDITION
2. CHECK X401
3. TROUBLE IN U402
CHECK CONNECTION LINE
FROM D-SUB TO U402
YES
YES
YES
CHECK U608 PIN3
3.3V?
NO
TROUBLE IN LIPS
YES
CHECK U605
PIN2
2.5V?
NO
TROUBLE IN LIPS
YES
CHECK U607
PIN2
1.8V?
U402
G4, G3
OSCILLATE AS
14.318MHZ?
Q105
PIN3 IS 65.22KHz H-
SYNC?
Q106 PIN3 IS 60Hz V-
SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 11?
6
87
6 7
Waveforms
U402-G4, G43(14.318V) Q105-#3
8
Q106-#3