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I AM HAVING THE EXACT SAME PROBLEM WITH MINE ! But before mine turns off, it shows a blurry squiggly red mark on the screen then shuts off and wont turn back on sometimes for several hours.. And everytime I CAN get it back on, I have to unlpug the whole thing and plug it back in...
pull out the plug and whilst pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket,the set will stay on,test your voltages and monitor problems especially vertical. Or download my 27C-240 schematic,it will help you alot,request it at email@example.com
Sounds like you have a bad picture tube. More than likely the CRT could be shorted, which would cause the set to shut down. My first advise would be to power up the set with an isolation transformer with the voltage about 60% approx. 72 Volts AC, and monitor what happens when you increase the voltage slowly. If the set remains on at 60 -70 %, then when increased to 90 - 100% it shuts down, you have something drawing too much current ( which could be the CRT )
I have a similar problem. I recently got a comcast dvr cable box, and after receiving the second box, my tv started going off and coming on all by itself. It may have something to do with the cable. For me, I think the cable box blew, or shorted something in the tv.
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.
could be noumerous things:
1. check power supply, too high or too low voultage may cause TV to shut down. measure it to detarmine if power supply is faulty.
2. check convergence board. If either of these 2 fuses on the convergence panel are open then replace the STK output devices PLUS check for any resistors in that circuit that may have overheated and changed value. Use actual fuse values, putting in a
larger fuse, even to try and diagnose problem, will cause more severe damage.
3. Check for bad solder connects on the PC board in the area of the power cord and related components.