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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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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.

I have a 47 Philips flat screen model #47pfl5708/f7 . the screen went dark when I turned it on. It flickers a little but nothing shows up I was wondering if it was the main board or the t-con board?

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.

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.

Flickering can be either with the fault to its back-light inverter or with its main power supply regulator board.

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
- Power LED on, but no picture
- 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.
If they appear bulged on top, then they need to be replaced.
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.
Check the cables, connectors and connections.
Take it to a repair shop.

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:

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.

Vizio VS420LF1A, approx 2 years old, I get red lines in the picture. If I turn the TV off then back on, it goes away for a while.

Thats the first sign of the Display panel going bad.
Check out your model number on Encompass

My 42" Vizio LCD HDTV

It can be the unstable power supply due to bad DC filter caps, bad T-CON boards, main board.
I would inspect the power supply first for caps with domed tops.
Basic troubleshooting guide here:
Failed TV and Monitors:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

Flickering t.v.

Is the backlight still on? If so bad lcd controller board
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