Strong SRT4155Evolution, Service Manual

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Y
?
Check Point : U301 Pin 32
CVBS
?
Check Point : U301 Pin 34
Failure Causes and Solution
If the video signal is not operating correctly, you should check R314, R315(18 Khom).
And you may try to check the net concerning to B, G, R, Y, C, CVBS on R501, R503, R505, R507, R509 and R511.
When you had finished checking the above net or device and all these are OK, STI5518 maybe damaged.
Then you can try to replace the STI5518.