LG Flatron L1750B Service Manual page 17

3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR
NO RASTER
(OSD IS NOT DISPLAYED)
PIN 18, 90
PIN96, 97
1
OSCILLATE AS
12MHZ?
PIN43 IS 48KHz H-SYNC?
2 PIN44 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
1
U201-#96, 97
U201
3.3V?
YES
U201
YES
U501
YES
2
U501-#43 H-SYNC
NO
NO
NO
2 U501-#44 V-SYNC
- 17 -
CHECK U801 (17", 19")
CHECK U803 (15")
1. CHECK PIN122, 123
SOLDERING CONDITION
2. CHECK X501
3. TROUBLE IN U201
CHECK CONNECTION LINE
FROM D-SUB TO U501