I have a DM500S connected to the TV through a Scart cable in RGB mode, that offers poor image quality ... meaning that the colors are unstable and you can see in the background the blurred image of another TV channel (probably one of the terrestrial antenna).
I've tried with different TV sets with the same effect, for what I deduct that there is something wrong on the DM500.

I've seen somewhere that some people had detected a low output level of the DM500's SCART connector, and that the fix is to solder a 10 kohm resistor in paralel with R109, but I'm not sure if that is my problem or not.

Can anyone confirm if the poor quality could be due to that?
Anyother suggestion?
Thanks in advance.