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If it turns On just for a moment; at least, and the standby/power light at its front panel comes ON; and it goes OFF withing seconds; the main board to the set is faulty. If standby/power light at the front panel does not come On; the main power supply regulator board [inside] the TV is faulty.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Check the capacitors on the power supply first. If any have domed tops or signs of leakage, replace them. I had two go bad on mine. Call electronics parts supply stores first as these are not your average capacitors.
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