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the relay on the power board needs to be replaced; if you feel confident to do this:unplug the tv wait about a 1/2 hour then remove the tv's case carefully look for a small black or, brown box about 1/2" x 1" x 1/2" this relay should have a designation such as Rly 1 printed on the circuit board it must be unsoldered and, removed the numbers on the relay can be entered into a search engine to find a replacement
sounds like you might have an auto overvoltage shutdown circuit kicking in. The hivoltage goes to high and the monitoring circuit auto shuts down. More than likely trouble is in hivoltage circuitry. If you have a transformer that will allow you to bring up the set slowly without shutting down and you can look to see what's happening.
There are a few things that can cause that. Pretty much the TV is shutting itself down because it recognizes and issue in one of a few circuits. If you're getting a flash and then it cuts off my first guess would be a vertical issue. May be best to take it in to a repair center and have them take a look at it. Shouldn't be any more than $20 for a diagnostic check on the unit.
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,