LG Flatron LCD 575LE Service Manual page 16

4. NO RASTER (OSD IS DISPLAYED) – gmzanl
NO RASTER
(OSD IS DISPLAYED)
YES
U3
POWER PIN
3.3V?
YES
CHECK
R,G,B INPUT?
U3 PIN 87, 91, 95
YES
CHECK
H-SYNC INPUT
U3 PIN 150?
NO
1. CHECK PC
NO
2. CHECK SIGNAL CABLE
NO
CHECK U2, U24
& D-SUB CONNECTOR
LINE
CHECK H-SYNC LINE
(D-SUB→U6→MICOM
→U3 PIN150)