LG LB504N-XL Service Manual page 17

4. NO RASTER (OSD IS DISPLAYED) – MX88L295EC
NO RASTER
(OSD IS DISPLAYED)
YES
U201
POWER PIN
3.3V?
YES
CHECK
R,G,B INPUT?
U102 PIN 7, 15, 22
YES
CHECK
H-SYNC INPUT
U102 PIN 40?
NO
NO
NO
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CHECK U803
1. CHECK PC
2. CHECK SIGNAL CABLE
D-SUB & DVI-I
CONNECTOR LINE
CHECK H-SYNC LINE