NEWS
some progresses...
an ArcadeItalia user sold me a generic KT-3 chassis. It was quite clean and I cold see someone made a recap.
I removed all tuner circuits, sound board, remote control circuit; then I replaced the input signal board in order to manage RGB directly.
and. IT WORKS!!
I'm fighting with the calibration now but I'm confident I can do it...
The first picture shows the image when I plugged it the first time, then I regulated some pots...
CURRENT STATUS
Connecting the sound board +5V decrease to +1.4 so I have a short somewhere or wrong connection...