No other ideas?
It's really confusing to me how the Composite video works, while the RGB Video is only white (or black when using 150Ohm resistors).
Anything else I could check other than R42-53 and VT13-15?
EDIT: Appears my TV doesn't want to switch from SCART-Composite to SCART-RGB anymore, as I'm getting the same issue with my Pentagon 128.