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Re: turn off after about an hour
This is likely to be some sort of heat isue where it sends itself into self preservation mode when it gets too hot and then will only turn on again when it has cooled off. Try cleaning any of the air ducts located in the back of the set to see if you remedy the situation.
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Sound like you have a overheating problem. Your capacitors might have reached their end of life thus making them overheat quickly. Try to check if there is a fan inside your TV. If there is a fan, try to clean it see if that helps.
This sounds like a heat related problem, which could be a faulty chip or a cold (bad) solder joint on one of the PCBs (printed circuit boards). Due to the lethal voltages present inside a CRT type television, it is strongly advised to have this repaired by a qualified technician. however, if you or someone you know is technically inclined, you can try to fix this yourself. Cold solder joints can often be spotted by visible cracks in the solder joints. a through inspection of all the boards could easily identify the problem which can be resolved with a quick tap with a soldering iron and perhaps a little extra solder added to the joint. if that yields nothing, another method is heat/cold stressing the boards while the TV is running. With the TV on, spray small areas of the PCBs with cold spray (or a can of compressed air duster turned upside down) until the tv shuts off. then heat the last sprayed part with a hot air gun (or a hair dryer) until you can get the problem to repeat regularly. inspect the area causing the problem and you will probably find the culprit.
Probably in 98% of TVs having the same problem solution is only one, to check and ensure that each electrolytic capacitor of the power supply unit is properly working, but you'll need equipment, which is expensive, so cheaper would be to replace low voldage capacitors, as they might by dry over time. For ordinary TV it would be 2-8 dollars in capacitors, to replace all of them. Or If you're experienced, try to test them using multimeter. You'll need to watch the discharge time.
Hi: Sounds like it might be an overheating part, and the short is shutting of the set. Or it could be an intermittent connection in the pc board. Either case it would have to be repaired by a expert. sorry.