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I have a vizio m420nv tv that only half of the screen has a picture

When I put both ribbon on the main board the blink a white screen but when I unplug the top ribbon half of the TV will have a picture

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  • Vizio Master
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Replace the LVDS cable with a new one.

Posted on Dec 12, 2016

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1 Answer

My Vizio m420nv tv the left half of the screen has a yellow tint throught the whole screen. the right hand side is fine. Ive changed the T Con Board and didn't change anything. any ideas?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

Dec 01, 2015 | Vizio m420nv 42 in. LCD HDTV

1 Answer

M420NV


Check and replace back-light inverter board. Check the input supply voltage to back-light inverter board. If you are not familiar with electronics, do not attempt to repair. Whether you suffer fatal electrical shock. Instead, contact any experienced service technician, or the nearest service center.

Apr 23, 2013 | Vizio Televison & Video

1 Answer

Vizio M420nv LCD TV Black Screen


lightning can do extensive damage to electronics equipment especially flat panel TV's. I would really recommend a professional diagnosis instead of board swapping. You could have several boards that are damaged!

Feb 13, 2013 | Vizio m420nv 42 in. LCD HDTV

1 Answer

No picture or sound


Its the main board 90% of the time when a vizio has that symptom.

Jan 10, 2013 | Vizio 39" E390VL 1080p LCD HDTV

2 Answers

Vizio m420nv has no sound or picture


High there!
I want to try this, change the video card ( video audio section ) of the TV

peace .

Apr 21, 2017 | Televison & Video

1 Answer

Vizio m420nv has sound but no picture


Hello there

Actually that problem is very common on all LCD TV,, that problem is cause of either inverter board or t-con..

In this case you don't need to check the voltage that is too complicated for you,,only visual check is enough..

I share you my tricks and hope it helps..

Power on your TV turn off your lights..if you will see the light comes from the screen the problem is t-con..if no light the problem is inverter board (backlight) board

Hope it helps..

Don't forget to rate..

Aug 25, 2012 | Vizio m420nv 42 in. LCD HDTV

1 Answer

Hello. I have a LG 47lg50-ua that when turned on, the right half of the screen goes white. The left half still plays fine. The warrenty had just expired so. I took the back of the tv off and looked around....


If you changed the Ribbon cable and its still the same then the T-Con board would of probably gone faulty. Lots of weird screen problems can be accounted for the T-con board.

Mar 22, 2011 | Televison & Video

1 Answer

I just purchased a brand new M420nv 42 HDTV LCD LED and turned it on for the first time & the screen was white with blue vertical lines (very similar to a UPC bar code) on the left side of the screen. ...


For sure a defect. You are looking at a T-con board that is faulty. Return immediately and get a different one. If it's within 30 days just swap out and avoid having to wait for a warranty repair!


Please rate if this helped :)

Mar 09, 2011 | Vizio m420nv 42 in. LCD HDTV

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