RGB not working for red

Hi @musdepiazhari

Is the red not working on both of the RGB inputs i.e. RGB In1 and RGB In2/out or not working on only one of the RGB inputs?

Here's an image, taken from the schematic on p.52/81 of the service manual showing the red signal input wiring paths of both of the RGB inputs, to the A/D video decoder

If only one RGB input has the problem then check that the wiring path to the decoder is OK for that input.

If both RGB inputs don't work then it may be a decoder problem affecting the RGB inputs only.

(click on image)