Try unpluging the tv for about an hour. I have the same problem and a tv repair man suggested the solution. It work every time I have the problem, although it is happening more often now.
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I suspect wrong model number is listed here as this set makes no beep at turn on; older set made around 2000 but if it is your model here is some information to look at.
For a 10 years old TV, it might not be worth fixing it. Save your money to get a new one once this one gives up.
I would keep it running using with the back cover off using that fan to keep it cool.
Hope this helps.
We have a Proscan 50" Projection TV. A T.V. repairman told us it was the HV (Horizontal Vertical) Splitter causing this problem and tried to find the part for us. The part for our TV was too hard to find though and we ended up not having ours fixed. Our T.V. is 8 years old though, and Proscan is discontinued. Maybe you'll have better luck finding an H.V. Splitter for your TV. Of course, you'd need a professional to install it for you. Good luck.
I've had the same problem with a 60" proscan. The tech repaired it ($400 for the repair) and left a note inside the chasis explaining what he did (in case he had to fix it again). He replaced a resistor and re-soldered a number of ICs. It happened to me again, and I may attempt the repair myself this time around.
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