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Re: TV goes out
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.
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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.
The set may have shorted the horizontal out put transistor since it kept coming on sometimes. This could be cause by the driver transformer arcing causing a "spike" in voltage going to you horizoltal out put transistor.