My 5 months old LCD HDTV (a 19" Philips model with 1440x900 16:10 resolution and PC input, mostly used for computer stuff) broke down yesterday. It is not completely dead. It dies within about 10 to 20 minutes of being powered on. By "dies" it no longer functions and the screen goes dark but the back light illumination appears to still be on. It won't turn off by remote or the buttons located on the top edge. I have to unplug the AC power.
I believe the problem is a thermal condition likely in the PSU.
This all started when I started watching WTOV-DT channel 9.3 weather radar. Someone online mentioned they saw the new channel so I checked it out. As some storms happened to be coming by the past few days, I left the TV on all night a couple times. Normally I have left it on with the PC, which would go into video power saver made shutting off most display functions. But with the radar it remained running constantly. I neglected to think about it. I was more concerned about the speed of getting it turned on if I wanted to watch in the middle of the night as that takes almost a minute for it to "boot up" from cold-off.
I did notice once that the air rising from the top side vents was particularly hot. I shut it off at that time. But later when I had it back on again, it eventually just up and died on its own, like the CPU had frozen.
I have allowed it to spend much time cooling down (hours in a cool room) and tried it again. The longest it will now run is about 20 minutes. When it actually dies (I finally watched it for long enough to see it do this) it does some kind of pixelation thing that is rather different than digital TV pixelation. It does this even for analog TV channels and PC input. It then blanks out and resets a couple times, coming back on. Finally it stays off.
It's unplugged for now and I won't use it in case such usage could cause more permanent damage.
I'm contemplating opening it up and trying to see if I can figure out what might be wrong inside. Maybe it has gotten too dusty inside and is not letting heat out fast enough and its a simple thermal trip. That pixelation on the screen does seem to me that the CPU or other digital circuitry is getting a low or incomplete voltage situation.
I've never opened up an LCD flat screen TV before. Are there any general suggestions on how to handle doing this to avoid damaging it in other ways?
Has anyone here ever opened up one of these before?
I'll only do this if I find it's not under warranty. I don't normally buy those extended warranty plans for something in this price range, and this event won't change that (I would for something in the $2000 price range). But maybe the factory warranty still covers it. I'll have to dig the box with all its paperwork out of the garage to see. Most things I buy don't break for years. This is the first thing to die that soon in at about 10 years (a 5GB HD died a month after I bought it long long ago).