Question about RCA F32632SB 32" TV

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Hour Glass picture on a RCA TV F32632SB

My RCA TV F32632SB just decided to display the screen as an hour glass. Can you tell me how to fix the problem.
Thanks,
Dan

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I looked up this model and found the following electolytic capacitors to be the most likely culprits within the pincushion circuit. Check these first. The starred one is the one I have replaced in the past to resolve this.

C4851 10ufd 50V
C4853 10ufd 63V
C4854 2.2ufd 100V
C4855 2.2ufd 50V
* C4862 100ufd 25V

Good luck,
Dan

Posted on Jan 15, 2009

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If there is a hour glass shape to the image but convergence is normal, there are 2 possibilities. You either have a pincushion correction problem or if the hour glass seems to be moving, it will be an open filter capacitor in the power supply.

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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

Jan 15, 2009 | RCA F32632SB 32" TV

2 Answers

Have you ever had this problem?


Sorry Ginko, but a convergence problem would have the curves down from the top and up from the bottom. The hourglass shape is a pincushion problem. This can be as simple as a bad capacitor in the pincushion circuit.

Could you please confirm the model number so I can look up the probable part?

Thanks,
Dan

Jan 08, 2009 | RCA F32632SB 32" TV

1 Answer

RCA TV with an hour glass shaped picture


I am sorry that its took so long for me to reply been backed up in shop, anyway what you have is bad solder joints on large Diodes Resolder ends on all of them and this should slove your problem if you havent done so by now.

Aug 02, 2008 | RCA F32632SB 32" TV

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#F32632SB Picture problem


I know what is wrong with your set but i am not at my shop in order to let you know what it is,it is a cap in high voltage area.let me know if you still need help with this.

Jul 06, 2008 | RCA F32632SB 32" TV

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The picture is convexed,or hour glass.


Sounds like problem in B+ voltage line to horizontal output transistor. Possible bad filter capacitor or leaky diode in power supply.

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Your problem is a bad main B+ capacitor. The right way to find this would be with a good ESR type capacitor meter. If you do not have an ESR cap. checker or do not know how to use a cap. checker. a local repair shop should be able to assist you in this repair at a decent price. Let us know what you did to get this set fixed?

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