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I have an HLT5075SX That has had no problems until today. I came he a turned it on and it ran like it always does but after a min the screen went black and the 3 LEDS on the right started blinking bu the sound still worked but then the TV shut off about a min after the picture went out. All the fans appear to be working. It does the same thing if you shut it off and start it back up. Any Ideas?

Hello,
right off the bat if this is the first time this TV has given you any problems and you purchased it new, then I would put my money on a new lamp. If you have replaced the lamp before and the one you are using is under one year old, I would start by changing the ballast.
hope this helps!