LG FLATRON L1750S - Troubleshooting No Raster (gmZAN3 SL)

- 16 -
1. CHECK PIN88
SOLDERINGCONDITION
2. CHECK X501
3. TROUBLE IN U201
U201
POWER PINS
3.3V?
NO
CHECK U803, U801
U201
PIN88
OSCILLATE AS
12MHZ?
CHECK CONNECTION
LINE FROM U201 TO U501
TROUBLE IN CABLE
OR LCD MODULE
CHECK 5VR LINE
U501 PIN8
5V?
YES
YES
YES
YES
3. NO RASTER (OSD IS NOT DISPLAYED) – gmZAN3SL
NO RASTER
(OSD IS NOT DISPLAYED)
U501
PIN43 IS 64KHz H-SYNC?
PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
NO
NO
NO
52
2
5 6
Waveforms
U501-#43
6
U501-#44U201-#88
http://www.wjel.net