This could be a High- Voltage shutdown circuit problem. The reason it will stay on longer with a bright picture, is the high voltage is slightly reduced, not allowing the shutdown circuit to shut off the set. But I believe your problems to be in the shutdown circuit.
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Had same problem Sylvania SRT2232s 32"had to keep powering on and off until it warmed up enough to finally stay on. Problem was the 100/50 & 1/50 filter cap took it to local repair total cost to fix was 74.52 works better than ever
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 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!!!
Intermittent problems are the toughest to track down, but usually have one of two root causes. Cold solder joints are an intermittent contact between where a component (transistor, etc) is mounted to the circuit board and the electrical contacts of the board itself. The other cause is components which break down under heat. Either way, if your not much on troubleshooting, have a TV shop service it, it can be easily repaired.
As far as fixing goes, you might as well get a new TV... Unless its a LARGE EXPENSIVE HOLY $%^# TV, It will cost more to fix, than to just buy a new one, unless its under warranty, which being an older model as that (or so im reading) It may not be covered.
Try unplugging the TV, and while unplugged, hold down the power button for a full minute (yes, with the plug NOT in the wall) after a minute, plug it back in, and try. Its a hard reset. If it still does not work, and you've tried different outlets, It's probably a repair issue, and you'll need to get someone to fix it, or just junk it :-/
Hello according to the symtom that you have describe I think that maybe you have activated the sleep function button on your tv and if this is not so maybe there is an internal problem on the main board of the tv.