Question about Sanyo DS31590 31" TV

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Problem with my tv

I change the LA7841 out vertical, the tv was closed vertical. Now open the vertical but not have video neither audio. The screen to be color green with lines of erase. I need help, what can tobe. Thanks Jose

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Re: Problem with my tv

Check for shorts in crt have had a lot of these in the shop and its usaally like dude said bad soder joins but i have also had a fe 31's with bad crt some times can be burned out but not always its caused useally by means of droping or falling ask costomer more detail on whaen it quit also full of crappy caps and resistors in vert section check there to

Posted on Jul 31, 2007

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Re: Problem with my tv

If you did not have vertical drive, changed the IC, and now you do but the screen is green with retrace, you probably had two separate problems. In many cases these kinds of problems are caused by bad solder connections. It would certainly make sense. First I would resolder all connections on all boards (or at least all suspicious looking ones) and see what happens. If you're lucky this will solve your problem. Good luck.

Posted on Jun 26, 2006

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Have you vertical deflection circuit checked for bad Vertical IC, and or Bad vertical Capacitors in the vert output section for the deflection board. Also have Vertical output Pump up Capacitor replaced, also have B+ voltage check coming from flyback transformer, for any open fusible resistors

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1 Answer

No video on my JVC AV-30W475 30" flat screen.

It sounds like you have bad solder connections in the Vertical circuit or the horizontal circuit. The Vertical IC may need to be replaced if resoldering does not help.
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1 Answer

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Vcc is on Pin 6 of the vert. output IC so you can trace that back to it's feed resistor (not sure the location number but you can find it easily by following the circuit trace). Depending on what your problem is you may need to replace some electrolytic capacitors as well. Follow pin 7(pump up) back to it's electrolytic cap. and look for swelling or bulging. Look for other bulged capacitors in the vertical section. You may also identify a bad resistor by a discolored look but not always, if in doubt meter it.
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2 Answers

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This is a fault in the vertical circuit. It can be either a bad solder connection of the vertical IC or a defective IC. If you can solder, you can fix this yourself. Open up the back and locate teh vertical IC. It willbe a small flat IC attached to a heat sink and be marked LA7841. Resolder the pins first. If that fails to resolve the problem, replace the IC. Please note that there may be capacitors in the circuit that need to be changes as well, but without the chip working, it will be difficult to determine which ones. Update this once the IC has been resoldered or replaced with the results and we'll continue if necessary.


Sep 25, 2008 | Sanyo DS31520 31" TV

1 Answer

Sanyo DS31590 31" TV vertical deflection

If the vertical is not defective or shorted there is a possiblity of bad solder connections on the vertical ic. If connections are good and has b+ voltage to the chip replace chip which is IC 501 LA7841 or LA7845 and change c511 (decimal point 1 film capacitor)

Dec 28, 2007 | Sanyo DS31590 31" TV

1 Answer


maybe, try replacing the IC

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4 Answers

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Set has a bad vertical sweep IC. Also This Sanyo has a tendancy , when the IC blows out , to take the fusable resistor in the sweeo supply that feeds the vertical IC. This set should only be serviced by a trained technician because of ther high Voltage that lingers within. This repair should run you antwhere from 85.00 to 150 bucks. Good Luck

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