Question about Panasonic CT-36D32 36" TV

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Picture Would Come In and Out, Now Not at All

At first, it would take a few hours before the problem would occur. The picture would go out, and then almost immediately come back on. Over. And over. And over. Turning the TV off and then on again would be no use immediately, but it seemed like I could let the TV "charge" and after 5 hours or so, I could back to square one, where it would take a few hours before the flickering would begin again. Over the last two weeks though, it has gotten worse, to the point where now it's roughly 5 minutes before it begins flickering, and then after a few flickers, it's off completely. The sound is still fine, but the entire video is gone. Any suggestions?

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Re: Picture Would Come In and Out, Now Not at All

It seems as though from your description it is just the brightness changing. The Cathode Ray Tube has three electron guns at the back end. These are for green, blue, and red. Each gun has a cathode and a grid. Nearly all control the brightness by having the grids tied to a variable voltage. And nearly all control the colour and luminance by an amplifier connected to each cathode. As you do not say the colours change the the amlifiers are OK. I would suggest the voltage to the grids ( or cathodes in some), is unstable due to a bad connection or a dry joint, or a faulty resistor in that part of the circuit. Very old sets without remote control used a potentiometer to vary the brightness. A voltmeter is all that is needed. When the picture goes off try holding the increase brightness for some time, to see if it reappears.

Posted on Nov 05, 2006

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