Question about RCA F27628 27" TV

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Shrinking picture My TV will be on for a while (times vary) then it will "pop" and the picture will shrink from the top and from the bottom. There is something there, but you are unable to see it. Any suggestions?

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Re: Shrinking picture

Your TV has sevral loose connections in the tuner circuit as this is a common issue with the chassis you have in it. It is not an issue for the novice to repair. You will need a technician to look at it.

Posted on May 03, 2007

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Pictures shrinks.. Panasonic TC-20LM Television

Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.

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You have bad solder connections on the vertical output IC or on one or more of the surrounding components. Good Luck

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Hi you have lose solder in yor vertical section have a tech resolder it or that problem will cost you .hope you have already have it remedied.

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All symptoms indicate a problem in the vertical circuit,the first thing to look for will be loose conection on the vertical output IC,sometimes this IC goes bad completly and it needs to be replaced.If you are familiar with soldering electronics you can take care of it but if you are not too familiar you can play it safe and take it to a servicer ,it will be a lot less expensive than if they come to your house.Let Us know how it goes or if you need more information.

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