LG Flatron L1750S Service Manual page 20

4. NO RASTER (OSD IS DISPLAYED) – gmZAN3SL
NO RASTER
(OSD IS DISPLAYED)
U201
POWER PIN99(1.8V)
PIN33(3.3V)?
YES
CHECK
R,G,B INPUT?
U201 PIN 70,74,77
YES
CHECK
H-SYNC INPUT
U201 PIN 95?
YES
CHECK
V-SYNC INPUT
U201 PIN 96?
YES
TROUBLE IN
LCD MODULE
NO
NO
NO
NO
- 17 -
CHECK U803, U801
1. CHECK PC
2. CHECK SIGNAL CABLE
& D-SUB CONNECTOR LINE
CHECK H-SYNC LINE
(D-SUB→U501→U201 PIN95)
CHECK V-SYNC LINE
(D-SUB→U501→U201 PIN96)