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Vizio vs420lf1a screen flickering?

I have a Vizio vs420lf1a and when I turn it on the screen flickers and there is a double image. Is this a bad t-con board or something else?

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Larry

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  • Vizio Master
  • 3,311 Answers

Clean the cable and connector contacts for starters, if that doesn't solve your issue try a new tcon board.

Posted on Sep 20, 2021

Testimonial: "Connectors cleaned and new t con board installed. TV no longer when flickers when powered on but the screen is black and there is a constant buzzing sound."

  • Anonymous Sep 28, 2021

    Connectors cleaned and new t con board installed. TV no longer when flickers when powered on but the screen is black and there is a constant buzzing sound.

  • Larry Sep 28, 2021

    2 things come to mind, is the replacement tcon defective...what does the set do with the old board installed? and 2nd did you short a couple of the copper strips on the ribbon cables going from the tcon to panel board, it's easy to lift them if pushing to hard when cleaning.

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it really depends on were the flicker is, if its the backlight or the screen, flicker can mean them both, t-con board only controls the screen out put on lcds, but on plasmas it works with the back light inverters. if the screen is white and not flickering while looking at the back of the screen on an lcd then it could be the t-con board failing it could also be a bad connection to the board from the wires. the plug were the main board connects to the t-con board if you have the back off and wiggle the cable and see if it stops the flicker.
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It is possible, the T-con board does produce the image you see but trying to fix this by guessing is a really bad idea. I would just buy a new TV and avoid the chance you are not correct about defectivethe part.
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My screen is flickering on and off on Vizio LCD TV? I was wondering if it was the main board or the T-Con board.

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Luxor 40 914 tvb

If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
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- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
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New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
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Picture with distorted,flickering, darkened area on rt. side of screen . Up to half of the screen sometimes. Sometimes looks like vertical hold is rolling some. Then will be clear with no or tiny amount...

There are several possibilities here.

To be able to help better we'd need to know the model number.

The most likely suspects are the T-CON board, one of the two backlight inverters and the display itself.

Of those only the last one is usually not curable.

Here's an example of a popular set of inverters that , when one goes bad you can get one half of the screen very dark:

http://www.coppelltvrepair.com/p/428/sanyo-dp42848-p42848-00-backlight-inverters-replacement-for-dark-screen-no-image-problem

On the other hand, if you have vertical shadows and some flickering that's probably NOT going to be a backlight inverter.

Flickering would be caused by either the T-CON or the panel.

Since a bad panel is mostly NOT curable you may want to check the price of a replacement T-CON and decide if it is worth taking a shot with one before you displace the TV.

Again, the thing to start with is the model.

Hope this helps.
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Check out your model number on Encompass Parts.com
Shopjimmy.com
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