Question about RCA F36649 36" TV

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F32672sb pincushion I am an electronics teacher at a high school and trying to figure out why this tv has a pincushion display......any help would be greatly appreciated

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  • shopteacher Sep 11, 2007

    the chassis # is ctc187cj3



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The pincushion is something that happens to this particular set. You may have the blue box type Capacitor in this set if not then a more brown or redish orange cap. I believe it is C4401. Most of the time its behind the Horizontal output. The cap gets leaky, most of the time it's a .47uf @250v. Try this, hope this helps

Posted on Sep 11, 2007

  • Lashawn Robinson Sep 11, 2007

    What chassis is this? Most of the time you will see a little bulge in the cap on the side, and this will tell you if it's bad or not. It also could be C4402, just not sure, because I don't have your Chassis#



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I have a RCA model F32672sb chas.number CTC187cl3 that the picture has a hour glass display meaning the two sides are shrunk in.Everything else seems ok.

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I need to find the pincushion circuit on my RCA F32632SB TV to check a problem with the TV displaying an hour glass picture. Where can I find a picture of this or a manual to guide me to the circuit?

The pincushion it intimately related to the horizontal circuits,the electron beam must travel farther to reach the corners of the crt and it does to the middle and so without pincushion circuits the raster would be bowed in on the sides on crts 27 inches are larger.Pincushion corrections straightens the raster by modulating the horizontal yoke current at a vertical rate.In an RCA tv the pincushion circuits are usually numbered 4800and the pin amp will probably be numbered 4801,its drive transistor should be Q4802,R4802 will be the width control,and R4805 the e/w pin amplitude. its inputs from the vertical should be Q4801 (subtractor) Q4803 (buffer) you should have a parabola waveform at 4801,yoke current can be modulated here without effecting high voltage.when Q4802 conducts voltage should decrease across Q4801 and the voltage drop across the yoke increases. The east west pin amp control 4805 controls how much of the vertical parabola is input to U4801 to compensate for changes in width caused by variations in beam current.By varying the e/w control resistor you can know if the circuit fault is in the input or output,if the picture varies in size the fault is in the input to U4801,if it does not vary check the output or U4801......hope that helps

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