Isee half the screen the other half is black and

FIrst of all this is a plasma set and thus does not have a "convergence" board. This could be as simple as a bad cable connection inside the set or a failed supply for one half of the plasma panel. If the unit is no longer under warranty. try removing the back and reseating all of the cables and connectors. Since the signal levels are extremely small inside, it doesn't take much to cause a problem.

Update this with your results and we'll continue as dictated by the results.

Dan

It may be a faulty convergance board. It could be another system board, but testing with capacitor tester will be needed to diagnose exact problem area. It may be $250 for a shop to repair. If you are handy with tools, you can find the faulty board and replace it yourself.