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Hi,

I worked on it today, and I found the fault: two op amps were defective.
I was able to test them out of circuit for confirmation.
The problem of not having a picture on the screen was mainly caused by the
fact that the DC voltage applied to the signal was not within the range of
the ADC AD9050, the 10 output bits of the ADC were all at logic 0.
I ordered the parts, but I'm not sure if there are other defective parts, I
will make this first replacement, I will see for the continuation.
I am not sure if the ADC is not damaged, removing these two circuits and
retesting the board, I saw noise on the screen because the voltages at the
ADC inputs are identical and in the normal range of the AD9050 component.
However, the noise had a high amplitude...I will be soon if there is still a
problem.

Thank you for responding.

Yves Tardif