Not sure if it is the power supply or not. It is the first thing I would check. Replacing the entire board is always easier than component repair if you can find one. This set will not have a dangerously high voltage after about 15 minutes of being unplugged. There are many posts on this forum and others about replacing capacitors. However, if you don't feel comfortable with electricity, electronics, soldering, etc, I would leave it to a professional. I don't have a service manual on this set. Without some understanding of basic electronics a service manual will do little good anyway. With that said, hands on is the best way to learn! Just be careful with live circuits!!!