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Yes this sounds like a power board related problem. Either replace the capacitors that may look like they are bulging (the tops) or have leaked ; or replace the power board with another unit -- used they are around only $30
Use a voltmeter to verify the presence of all the different voltages on the power supply board. If they are present, then replace the main board. You can get parts here: TV Parts Universal TV Stands DLP Chips ShopJimmy
If green light flashes more than 8 times, it could be as simple as repairing or replacing the power supply. Unplug the TV ,remove the back. Look for bulged or leaking capacitors on the power supply. Do it yourselfer? only if you have soldering skills, or purchase replacement board. remember, used boards are just as old as your failed board, buy new or rebuilt, Good Luck
Check to see if you get Va and Vs voltages from the power supply. There should be some wires running to the y-sus. A couple of those wires will be labeled va and vs. Are they present? There will be a sticker stuck to the panel somewhere telling you what they should be.
I had the same exact problem.
I removed the bulb and cleaned it. There is a small screen at the top of the bulb and it was covered with dust. Once it was cleaned I replaced the bulb and it solved the problem.
Thanks to those who posted the solutions
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