All you can attempt on this model, is to try leaving the unit unplugged for several hours, and then plug back in. This will drain the residual current from the power supply, and can act as an effective reset. If this does not work, there are several problems in your set that could cause this. It could be a faulty CRT , which would cost you more than a new TV to replace. other common issues are cold/failed solder joints and failing IC regulators, or capacitors. All of these problems are common with your set, and would require circuit testing and replacement in order for the TV to function normally again. Average cost for this type of repair will between $150-$250 depending on which circuit has the failure on the set. Given that a new LCD TV would cost you only around $250 for the same sized screen, it is not cost effective to repair this set. Unfortunately, there are no resets or series of buttons you can press that will solve this problem and the set will require component replacement to operate normally again.

If you'd like to have the set repaired, you can use the link below to locate a tech in your area:

http://www.tvrepairpros.com/