Question about Sanyo DS31520 31" TV

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No picture only a high pitch sound

My Sanyo model# DS31520 was showing fine then just went out. Now it won't turn on. When I plug it in, it makes a high pitched sound. The noise slows down and stops when the TV is unplugged. the power button doesn't work. What's wrong? Can it be fixed? Signed, TVless

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  • Anonymous Dec 18, 2007

    my panasonic tc-21s10m2 also have a same problem but in the mainboard some some three terminal device short out

  • jackin Dec 29, 2007


  • jackin Dec 29, 2007

    high pitch noise no picture will not come

  • Alewis310 Jan 07, 2008

    We have a Panasonci CT-3271S8 and have the exact same problem. It just happened two days ago. The picture is completely out and now there is just a constant high-pitch sound. We have to unplug it to stop the noise. The TV is 7 years-old, so if repair will cost hundres of dollars, I would rather buy a new set. Any advice?

  • Anonymous Mar 20, 2008

    my sanyo ds3120 made pop, then tv pic went out now a high pitch noise comes on when the tv is on.

  • Anonymous Jan 01, 2009

    My RCA started to black out a couple days ago. The sound would stay on, just no picture. The first few times it could be corrected by turning the set off, then on again. But last night the picture went black and it started with a high pitch sound that could only be stopped by unplugging the TV. I think the TV is about 10 years old.



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Yes,it can be repaired,sometimes for no reason components fail and they need to be replaced,if you are familiar with tv service you can check the horizontal output transistor,it might have gone bad(shorted out)and is all is going to take to get the set back running,sometimes the output trasformer damages the transistor and both have to be replaced,first just change the transistor and if it blows up again then replace the transformer,if you are not too familiar with servicing a tv be safe and call for assistance from a servicer,if you take the set to them it should be expensive.Let Us know how it goes or if you need more information.

Posted on Nov 08, 2006

  • Omar Urrutia
    Omar Urrutia Nov 08, 2006

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Tv just started making a very high pitched noise, although picture and sound are fine?

Barb, noise may be from a power supply/ transformer on it's way out.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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Jun 22, 2012 | Sanyo DS31520 31" TV

1 Answer

My RCA TV went blank and has a high pitch noise.

it's probably not the tube. Sounds like something is shorting the B+ from the power supply. Could be the Horizontal Output transistor or the Flyback transformer. Do you know how to find these components? I could be a rectifier diode on the secondary of the power supply as well. If you know what you're doing check those with a meter. If you don't know what you're doing, ask someone who does.

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Jul 22, 2009 | Sanyo DS31520 31" TV

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Sanyo tv making high pitch noise from loose cable connector

The noise is coming from the fly-back transformer. By moving the cable connector you move the main board. Unplug the TV and remove the back. The transformer has a red wire going to a rubber cup at the top of the picture tube. Looking at the transformer you will see a dough nut shape with a metal piece going through it .. Drive some tooth picks between the dough nut and the metal core. That should reduce or stop the ringing.

Apr 21, 2008 | Sanyo DS31520 31" TV

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Sep 06, 2007 | Sanyo DS31520 31" TV

1 Answer

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Rarely picture tube also shows the same symptom. High pitch sound is due to through deflection area LOT power supply is loaded. Compulsary horizontal output transister short. From your statement i think Lot puncture takes place. Change LOT and horizontal output transister and check tv is now working.

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Dec 22, 2006 | Sanyo DS31520 31" TV

1 Answer

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sounds like bad solder connections on ground of the inputs radioshack has a cheep solred gun and solder make sure set is unpluged

Dec 03, 2006 | Sanyo DS31520 31" TV

2 Answers

Sanyo DS31520 went dead

If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. Squealing noise is from the power supply teling you that there is an overload condiction. The overload is shifting the operational frequency of the power supply into upper audio hearing range. Check the diodes and caps in the supply circuit and the active components in the deflection circuit. also resolder the LOPT, h-output, h-driver, and h-driver transformer. Good luck

Jun 19, 2006 | Sanyo DS31520 31" TV

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