About 6 months ago, the projector light failed. After replacement, I noticed a faint buzzing sound coming from the TV. It has gotten progressively worse and, to top it off, the start-up time has gone from a few seconds to more than a minute.
However, the TV now is cycling on and off about every 45 seconds, or so. Sound still works, but the set powers down, then suddenly comes alive. As if you turned the set off, then manually turned it back on.
I hate to call a technician, but it's looking like this might be my only solution. HELP, please.
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Eric has been too busy to work on this TV, so I got it from him and am continuing with it. As soon as power is connected to it, the screen glows slightly, but you can only notice it when all other lights are off and the room is dark. But the TV does nothing else. I initially though it was the power supply board and replaced it, same result. I then noticed that there was a faint buzzing or humming sound coming from the X-Sustain board.
Thinking this was finally the problem, I replaced it too. Blast! No go. Ok, so now that we've narrowed it down, it HAS to be the Y-Sustain board Right? I don't think we can afford another board. What is it that fails on these boards? Could I just replace one or two MOSFETs? How do we determine which ones are bad? Thanks for your help.
Should have been 3300 UF 10V caps that were bad? Shouls have been replaced with 3300UF 18V. 50V is huge. If it was replaced with a 50 the polarity may be wrong or the cap it too big to be seated property. Sometimes the caps just dry out and even a normal looking one will be the culprit of no OSD. Are you getting an LED fault code blinking? That should be a red led. Do you hear the relay clicking.? When you replaced the caps did you charge them? Just plugging in the set without trying to power it on for about 20-30 mins. I may be able to help you