Hello, I have an old Sony Videoscope projection t.v. Model kpr-53ex35. the picture initially comes on but after about 15 minutes the picture goes very dark, you can only make out "shadows" on the set. After about 5-10 minutes the picture will come back on, and then it will go out permanently, totally black. I turn off the set and after 50 minutes to 1 hour, I turn it back on and the picture goes through the same routine. I was wondering if these symptoms were similar to those of your set and if you think re-soldering would help or any other advice would be greatly appreciated. Thank-you very much. By the way, how do you access/where do you find the board which needs to be soldered?