LG Flatron L1722P - Troubleshooting Guide; No Raster (GM5221 Related)

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3. NO RASTER (OSD IS NOT DISPLAYED) – GM5221
NO RASTER
(OSD IS NOT DISPLAYED)
NO
NO
NO
TROUBLE IN CABLE
OR LCD MODULE
CHECK U401
1. CHECK PIN169, 170
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
CHECK CONNECTION LINE
FROM D-SUB TO U201
YES
YES
U201
POWER PIN11, 50
(3.3V)?
U201
PIN169, 170
OSCILLATE AS
14.318MHZ?
U201
PIN181 IS 64KHz H-SYNC?
PIN182 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
4
65
4
Waveforms
U201-#169,170
5
U201-#181 H-SYNC
6
U201-#182 V-SYNC
YES
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