Question about Vizio SV470XVT 47 in. LCD TV

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Vizio SV470XVT1A makes screeching sound

Vizio 47 inch 120hz SV470XVT1A

Ive had this for four days. The first day after about 20 minutes of being on for 15-20 minutes it made a short loud staticy screech sound for about a second and the picture screwd up with colorful lines all over the screen. the remote wouldnt turn off the TV, I had to unplug it. when plugged in and turned on again it didnt happen any more that night and the TV was on for hours. This has happened twice since, within an hour of turning on the TV, only the second and third time, the sound didnt stop until it was unplugged.However one day it didnt do it at all. Otherwise the TV works perfectly. I still have time to return it, but I am thinking perhaps maybe it is electrical interference? Id rather not have to return it, this would be the second time exchanging it

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  • adetmar1 Jun 17, 2009

    For more information, I have it plugged into a Dynex power barhttp://www.dynexproducts.com/pc-333-6-dy... with nothing else plugged in to it. The only input source is my computer in the HDMI slot 2. If there is nothing I can try short of having someone come in and repair it, I will just echange it instead

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Hello,

This sounds as if it could be a ballast problem, or a switching power supply transformer problem. Both of these can produce this sound. I would suggest that you have a qualified TV technician repair this set due to the dangerous voltages and currents that could be present. In my experience with these TV I would have the technician pay special attention to the power supply board and the backlight/inverter section which includes the ballast used to fire the backlight.

I hope this helps,

Thank you,


Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Jun 17, 2009

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After a couple of years the Power supply and Inverter board capacitors are bad. This is common on most all LCD Tv's and monitors.They use cheap ones when made and can be replaced with better quality ones. Have a experienced technician check for bad cap's change them out.

Posted on Dec 24, 2012

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