James,

Unfortunately there's no socketed IC on the board.
Though, I'm quite confident that no pin is shorted with others. I'll
post a closeup picture of my mod later, so you can take a look at it.

I really wish it was something mechanical! Do you think a memory chip
caould be damaged by a temporary short circuit? I fear so...

Also, what makes me think that some chip is damaged, is that the
standard analog (RF) video output has the same problem as the newly
modded RGB output. Since the RF video output seems to be routed
*before* the mod I made, the problem must be even before the RF
circuit. That's why I fear that the memory is damaged.

If you still have some time for giving me more advices I'd really
appreciate it and I will not dispose of the console as I wanted to.

Expect the pic of the board later today.

Thanks again,
Mauro_