The T.V. has no lamp, it has 3 guns red,blue,& green. Unplug the lead that goes to the high voltage splitter(make sure t.v. is unplug). Then turn the t.v. back on if you hear the H.V. lead making a hissing sound continuously most likely the h.v. block needs to be replaced. Follow the lead from the flyback to the h.v. splitter, this will be the lead that unplugs at the splitter.
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It has you Posted as a projection TV and Not DLP, if Fan to Lamp stops running set will shut off to protect Lamp,I had a DLP that would play sometimes 30 mins then shut off drove me crazy trying to firgure it out and it turn out to be Fan would stop running I replaced Fan TV working fine . When you remove back engage toggler switch to up position put a piece of tape on it to hold it is a safty switch ,then turn tv on watch to see if all fans are running also if when tv trys to come on is there a spark coming from Ballast Board if so your new Lamp is defective it does happen if not your ballast board maybe Bad it is what turns on Lamp.If all fans are running Ballast Board.
if you heard a hissing or like static sound your board probably has a hole in it now. the board on the left side with the flyback fransformer. the hole is from where a prong has come loose an is arking over an it burns the board the ark is the sound you heard.