When TV is initially turned the audio will go out after about 3 minutes. When you reverse back the sound will stay on for about another 45 seconds then go off. If you shut the TV down, the sound will return again for about 3 minutes then shut down. This problem started about two weeks ago and I have had the TV since October 2013.
It's probably Thermal Runaway' a term used when a electronic component over heats and quits working. Go to Radio Shack and buy a can of freeze spray, Take it down to where you can get to the chassis and when it goes out starting spraying components and when you get the right one the sound will pop back on/ This spray is not flammable and does not conduct electricty. That component will have to be replaced,
SOURCE: Samsung DLP HLN5065 intermittent shut off and color scrambled display
bad light engine assembly.......
SOURCE: My TV pictures turns black afetr a few hours but I still can hear sound perfectly!!!
It sounds like your rptv lamp is going out. If this is an older DLP this is most likely the cause. You can get a replacement at www.laptopsforless.com part number BP96-00224J for $151. If the tv is still under warranty, I would have them do it, otherwise replace it yourself. If so here is a link to give you step by step instruction. Please give me a good rating. ;-)
SOURCE: DLP TV starts to loose picture after 1 - 1/2 hours of use
This tv has a 3 board video path. Analog main pcb --->Digital main pcb --->DMD pcb. see which inputs have the problem to narrow it down. if only some inputs, suspect analog board. if everything flickers(all inputs and menu), suspect the dmd or engine. you can see the lamp shine out the back. if the lamp is flickering, suspect lamp or ballast.
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