Question about Sanyo DS31590 31" TV

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Picture too wide

I have a pins cushon problem....

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  • carrierelec Apr 10, 2008

    Pins cushon problem picture too wide....

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This is usually caused by failing capacitors in the pin amp section. Testing caps with an ESR meter is a good way to find the failed caps. Or, you can do it by replacing the caps by guessing. Or, you can use a scope and follow up for the proper waveforms.

While you are working on the set, it would be best to verify the caps in the power supply and scan amplifiers.

If the fault is more complicated than just caps, you will probably require the service manual and have to spend the time to troublshoot the pin amp circuits.

Jerry G.

Posted on Apr 14, 2008

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DON'T FORGET TO RATE:

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I cannot tell you locations for parts in this model, but this fault is genericaly very much the same for all CRT sets.

There is a fault in the pin cushoning circuits. Usually this is from failing electrolytic caps in that area. The pin amp is also part of the vert and horiz deflection circuits. Sometimes the pin amp driver devices (IC's or transistors) can also be at fault.

With an ESR meter it is very easy to find the defective caps. They will have higher than normal ESR than the caps that are working properly.

If the barrel distortion is along the width of the display, this indicates that the pin fault is in the vertical pinn part of the pinn circuits.

Read about ESR for Cap testing at this link:
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A common fault are some of the electrolytic capacitors failing in the pin cushoning amp section, and probably in part of the scan amplifiers.

To service this will require the proper training and set-up to troubleshoot the set.

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