Question about Sanyo DS31520 31" TV

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Picture is shrinking horizontally to the middle?

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The trouble of your tv is the vertical part it has a swollen capacitors. It has a common value of 50v 450uf or try to check all leaky capacitors in the vertical section.

Posted on Oct 24, 2010

  • Todd Hill
    Todd Hill Oct 24, 2010

    450 mic hope that is a misprint!

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Bad conn. on vertical output ic

Posted on Oct 24, 2010

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1 Answer

JVC picture turns into a single line in middle of screen.


This is caused due to random falure of vertical scan circuits. It generally is caused by dried out capacitors or bad driver IC. Unfortunately it will get worse. If you fail to turn the TV off quickly you will burn a permenant horizontal line on the tube. Trip to the repair shop I am afraid.

Nov 30, 2009 | Televison & Video

1 Answer

Picture shrinks horizontally every few seconds.


You are changing parts in the wrong circuit. The problem is in the vertical circuit. Look for the vertical IC and resolder the pins first. It should be an LA7837 or something similar. Also, check the 100ufd and 47ufd caps in the same circuit.

Keep us posted.
Dan

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1 Answer

Picture on RCA TV shrinks to a horizontal line


Hello,
Sounds to me you have a cold solder joint ( loose solder connection ) on the printer circuit board around or on the vertical chip or on one of the vertical capacitors. You may also have a bad vertical chip or a bad vertical capacitor, but I doubt it since it did come and go. I'de get a soldering iron and some solder and touch up the connections. I will remind you that you need to always excersise saftey by making sure, before removing the back, unplug the TV from the wall, and use care not to come in contact with the large red wire going to the back of the picture tube as the picture tube can be turned off and still store lots of voltage ( up to 35,000 volts). Always stay safe and when soldering, use care not to run solder across places that will make a short.
Good Luck and I hope this helps
Ed Meshechek ( Radio Man )
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Mills, Wyoming
307-266-4675

Dec 19, 2008 | Televison & Video

1 Answer

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the problem of your tv is in vertical section, to be sure change all the capacitor in vertical section.

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1 Answer

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The vertical output IC LA7847 is failing. It will likely fail permanately and you will have just the horizontal line. The set will require service. Just do not run the set very long in this state. That thin white line can likely burn into the crt phospher and will show all the time thus ruining the glass picture tube...

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check electrolitc capacitors in horizontal circuit

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2 Answers

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HI: Well that is a good indication you have a intermittent connection in the circuit board. Its time to take it to a repair shop. He will re-solder the poor connections. You should not need parts. Good Luck.

Mar 08, 2008 | Televison & Video

1 Answer

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first of all , it could be a solder problem try resoldering taking care do not leave any shorts circuits por ahi,may be a shorted coil, you have to test them all,look for a shorted diode esp. in de horizontal area. if any of this things sounds rare, leave it to the repairman!

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