I have the same problem with a 20" RCA. If I turn on the TV from the unit itself, it goes off in 2 seconds. If I use the remote (universal) it always stays on. Just a solution that works for me. Best,
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The first couple of seconds of operation, most TVs are doing some self-test and if something has failed making full power on dangerous (for fire) they will shut down.
Either a major component in the horizontal section has failed or the main power supply itself is defective.
I had the same exact problem!!!! If you unplug it, then plug it back in after a couple of days. You will hear a frying sound then a loud clap!!!! Solution: Replace it with a LCD.... Not worth getting fixed!!!