LG Flatron M1717TM Service Manual page 16

3. NO RASTER (OSD IS NOT DISPLAYED) – GM2621
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK U503 PIN3
CHECK U502
PIN2 1.8V?
PIN 108,109
4
OSCILLATE AS
14.318MHZ?
PIN3 IS 65.22KHz H-SYNC?
5
Q702 PIN3 IS 60Hz V-SYNC?
6
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
4
U202 #108,109(14.318V)
3.3V?
YES
YES
U202
YES
Q701
YES
5
Q701-#3
NO
NO
NO
NO
6 Q702-#3
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TROUBLE IN LIPS
TROUBLE IN LIPS
1. CHECK PIN 108,109
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U202
CHECK CONNECTION
LINE FROM D-SUB TO
U202