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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 a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
You have problems with a condenser that allow the power supply to maintan an acceptable level of voltage in order to keep the TV on. take to a tech to be fixed. unfortunatelly, this problem needs a tech to take measures in the circuitry to find the component that causes the problem.
first place to start on this chasss is with a known failure in the horizontal circuit. there is a capacitor 2455 and 2 transistors locations 7461 and 7463 that have caused a wide variety of failures. i would recommend replacing these components before proceeding as they could be the whole of the problem.
Tvtek is on the right track. The remote will not solve the problem. Sounds like a voltage regulator in HV circuit if it only lasts a few seconds. If it stays on for a couple of minutes, beam limiter cicuit is pushing to overload and shutting unit down. Magnavox set not hard to repair, but a 27" set is not cost effective to repair either.
Same problem. The power button does not work. The volume and channel buttons turn the tv on. the tv then shuts its self off 15 seconds later. the red light blinks in second intervals while this happens.