Where exactly is that 3 legged diode? is it welded to the board? The horizontal adjustment certainly has a problem... The Horizontal Hold is very sensitive and won't center the image...
Look at the image from the video. The color goes out as soon as the tuner is set for a clear image (if the Accutouch control is pushed, the image stays in black and white...).
I turned the tint knob while the recording this video. It does affect the colors but they can't be set correctly...
http://youtu.be/5YwrNCDaZ4M