Hi I have a 1992 Panasonic model number PTP-51XF20A and I am having a problem with it that I had several years ago that I got fixed but I want to see if I can fix it myself since it only took the TV repair guy two minutes to fix it. The problem is when I turn on the tv the picture distorts and you can see the grid lines from the three picture tubes. When this happens you have to either turn the tv off and on several times of flip through the video channels to fix the problem and make the picture display properly. There is no problem with the sound just the picture. Could anybody please tell me what type of circuits I need to get and where they go on the board to fix this prblem. Thanks