Service manual

Page 32
MODEL: L423FR
2-2. No picture displayed and picture errors of PC signal only.
YES
Is all harness connected correctly?
NO
0.7Vp-p
Enter an input of WXGA(1360x768:60Hz) or XGA
(1024x768:60Hz) gray scale in D-sub connector(J200),
and select PC INPUT.
The video level inputs above 0.7Vp-p.
Poor harness connection or
defective cable.
Problem is in IC203 or IC2A0 or IC2A3 or
their peripheral circuits.
Please exchange PWB-MAIN
2-3. No picture displayed and picture errors of Component signal only.
1.0Vp-p
YES
Is all harness connected correctly?
Poor harness connection or
defective cable.
NO
Enter gray scale pattern of 1080i timing in J5A0
connector, and select COMPONENT INPUT.
The video level inputs about 1.0Vp-p.
Problem is in IC5A0 or their peripheral
circuits.
Please exchange PWB-MAIN