Trying to repair, Tv comes up normally..functions beautifully for about 10 minutes, Then the picture malfunctions i.e., goes black and white and "locks" up, sound still functioning, no blinking lights and can only turn off by unplugging. After waiting a minute or so I can plug back in and it will come back on normally. If I try to turn off before the picture locks ups, it will behave normally...i.e. will have a "cool down" period before shut off. The color wheel is "noisy" but I don't want to replace till I sure this unit is worth repairing. Have replaced the Lamp, But really wasn't needed. Suspect a pc board but which one? Any suggestions or advice would be appreciated. Avent