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Ur power supply board is dead, u know basic electronics’ and soldering?
Most of the times, the power suppply board just have dead leakages gases
capacitors.These capacitors alway bulges up on it top,or puff up on it
top.Replaced these gases leakages capacitors will get ur tv power stable,and
work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole
rerfurbish power supply board for the replacement.
I suspect the lamp area is VERY dirty as is the cabinet's filters and fans. This causes great stress on your tv and lamp. Take the time to clean all of them fully. Is the unit in a dirty area? or in a high temp area? DLP's dont like high temp or contaminated areas as they are NOT air sealed units.
You need to replace 4 capacitors on the DM board. It is located inside a metal box on the left side of the set, looking from the rear. The original parts are 1000uf 16v. You will need to install 1000uf 25v or 35v. They are located at the top of the board and are green colored.
My Mitsubishi WS-73713 had the same blinking green timer light problem and would not turn on. I tried the reset button and unplugging power to no avail. I found that by simultaneously holding down the remote control "power" button and "volume" button for about 30 seconds the blinking light would go out and a solid green light would come on. Even though the solid green light came on the unit would still not power up. After doing this several times however the unit did finally power up in a normal mode and appears to be working again. It's worth trying before calling in for an expensive repair. PS - From here on out I'm sticking with SONY or Toshiba sets which have given be great service.