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What's causing my Vizio E420d-A0 LCD TV to display flashing, horizontal, evenly spaced lines on the screen?

Please see video of the actual problem - This happens on any input source and also on live or paused video. I made sure all ribbon cables were secure and didn't notice any blown or leaking capacitors on the power supply and main board. Is it possible the LCD panel is just going bad?

Posted by wil0523 on


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The Knight

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  • Vizio Master
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If you wish to get some details; visit the sites linked here. Pull up older posts.
Faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
{View the site in web view by mobile or a desktop to see the search box. Mobile view has no search box.}

Posted on May 17, 2019


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SOURCE: I have an RCA TV

The fact that the screen illuminates properly and does not stay absolutely pitch black means that the backlights are working properly.

A faulty LCD Controller Board (or TCon board for short) could possibly cause the symptoms you describe. The Tcon board is usually located under its own RF shield and will have a large braided steel multiwire cable coming into the bottom of the board and several flat ribbon cables connected to the top by little plastic flip up connectors. A replacement board can be purchased on Ebay for around $70 plus shipping. See the following link for one example:

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the item information at the website indicated.

Just don't buy any that say AS IS for their description of condition. That is EBay speak for broken.
Make sure they say TESTED FULLY WORKING in the item description.

The best way to be sure you are getting the right part is to open up your set and check the part number that is printed directly on the circuit board itself. Then look that part number up on the internet or type that number into the EBay search box.

Just typing in the model number of your TV will sometimes give you a few different part numbers so you have to confirm which part is in your particular set.

Make sure any part that you order online has exactly the same part number as the one you are replacing. Sometimes it it just the last few digits that are different and it can make a difference.

Here are some links to some excellent LCD Troubleshooting Guides from another expert (BUDMRTN) that you can read through and get an idea of the LCD repair process:

Please leave a Thumbs Up rating on his pages if you find his guides helpful.

Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.

Thank you very much and good luck.


Posted on Apr 20, 2011



  • 1 Answer

SOURCE: samsung TV LCD horizontal line up

chenge panel

Posted on Jan 25, 2013


The Knight

  • 76352 Answers

SOURCE: My Samsung tv has thick horizontal line across top of screen

Check the LVDS cable that connects its T'Con board to display panel for any loose fitting at the both end of its sockets. Re-seat them once and check. This is not a problem with any capacitors. If you wish to get more details, check the site linked here. It has screen-shots to some faulty screens to LCD TVs. Compare them to that of your TVs' and make sure. Pull up previous posts there, either by its left side bar, or view it in Timeslide option.

Posted on Jul 02, 2013

Testimonial: "Is there a way i can post a photo of the picture on screen to you,so u have a clearer understnding of my problem?"


The Knight

  • 76352 Answers

SOURCE: I am getting a flashing abler light on the front that is in sync with a clicking relay sound. Why is wrong?

Just mind. We won't and have to go before your U tube video or any nonsense like that. Ok.
Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Jun 24, 2015


Electro Med Services

  • 6694 Answers

SOURCE: I have a Vizio TV model E550i-A0. Most of the screen has darkened considerably but has a narrow horizontal lighter stripe near the top of the screen.

LCD panel of the tv is faulty.
If you wish to get some details; check the site linked here. Pull up older posts.

Posted on Apr 07, 2016

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Take it in for repair. Television repairing is not a DIY subject. The course is 2 years full time.

We see self diagnosis posts here all the time and generally it is I changed this board, that board and that board and it still doesn't work. You can't return any of these parts when you buy them. If you like to have a gamble, sure, go ahead and buy the parts. It SOUNDS like the correct diagnosis, the backlight is gone. How about blown capacitors, have you checked for that?

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