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27 inch toshiba tube set 10 years old picture normal brightness then dims after playing awhile after a period of time picturererturns to normal

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Hi,
Problem seems with screen volts (1000V) that drives G2 of picture tube to accelerate electrons emission that creates brightness.
Usually high value resistor nearby G2 found defective in such kind of problem, check screen volts line that goes to G2 pin of picture tube as G2 should have 600 to 800 DC volts for normal function.
Hope these info will help you if you have knowledge about tv.
Let me know if there is additional question.
Thanks.

Posted on Nov 10, 2010

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