LG Flatron L1970HR Service Manual page 16

3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR
NO RASTER
(OSD IS NOT DISPLAYED)
PIN 71, 87
PIN127, 128
1
OSCILLATE AS
14.31MHZ?
PIN32 IS 48KHz H-SYNC?
2 PIN33 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
1
U101-#127, 128
U101
3.3V?
YES
U101
YES
U101
YES
2
U101-#32 H-SYNC
NO
NO
NO
2 U101-#33 V-SYNC
- 16 -
CHECK U501
1. CHECK C110, C109
SOLDERING CONDITION
2. CHECK X101
3. TROUBLE IN U101
CHECK CONNECTION LINE
FROM D-SUB TO U101