I wish I was closer to help. A cap kit is not difficult if you take your time. The screen pot you want to adjust is on the flyback transformer which is the large black cube attached to the chassis. It will have two knobs, focus, and screen. Screen is the lower one which it has been suggested to try and turn and see the difference. You can turn power off and try adjusting, but I would only turn it a little to the left. You can make this adjustment with the power on with no problem, but you do want to be careful what you touch. Good luck.