LG Flatron L1722P Service Manual page 17

NO RASTER
(OSD IS NOT DISPLAYED)
POWER PIN11, 50
PIN169, 170
4
OSCILLATE AS
14.318MHZ?
PIN181 IS 64KHz H-SYNC?
5 6
PIN182 IS 60Hz V-SYNC?
IS PULSE APPEARED
AT SIGNAL PINS?
AT MODE 12?
TROUBLE IN CABLE
OR LCD MODULE
Waveforms
4
U201-#169,170
3. NO RASTER (OSD IS NOT DISPLAYED) – GM5221
U201
(3.3V)?
YES
U201
YES
U201
YES
5 U201-#181 H-SYNC
NO
NO
NO
6 U201-#182 V-SYNC
- 16 -
CHECK U401
1. CHECK PIN169, 170
SOLDERING CONDITION
2. CHECK X201
3. TROUBLE IN U201
CHECK CONNECTION LINE
FROM D-SUB TO U201