Question about Vizio m420nv 42 in. LCD HDTV

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Vizio m420nv repair manual - Vizio m420nv 42 in. LCD HDTV

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SOURCE: vizio m420nv without a remote

Contact Vizio for part number by model number or Google the model to locate an original (universals are a waste of time and money and often are missing key features needed).

Posted on Apr 01, 2012

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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

Backwards/inverted picture vizio m420nv


this would require the service menu & I highly recommend a technician do this as if you are able to find the service code you can get into a position that the TV does not work at all.

Apr 21, 2014 | Vizio Televison & Video

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

Vizio M420NV Wont turn on


I have a suggestion if you have and are using a box of some kind with this set, remove set and box from power for awhile and then power both back, sometimes a box can trigger this type of event, hope it helps and it cannot hurt to try.

Dec 11, 2012 | Vizio m420nv 42 in. LCD HDTV

1 Answer

Vizio m420nv without a remote


Contact Vizio for part number by model number or Google the model to locate an original (universals are a waste of time and money and often are missing key features needed).

Mar 31, 2012 | Vizio m420nv 42 in. LCD HDTV

1 Answer

Mirror image - can't fix


It likely has a problem that has affected the microprocessor in some way which might be explained if you had a power outage?

I would suggest if you have not done so to unplug it for a while and turn it back on after a hour.

Also call customer service at Vizio and inquire if this is a known problem and if there is a possible software upgrade to correct and restore the set to original shape.

It can be a pain to call and wait on the phone and is hit or miss as to seeing if the person who tries to help knows what they are doing or not.

If they snap an answer "you need to take it to a shop" persist and try to talk to a technician.

Mar 22, 2012 | Vizio m420nv 42 in. LCD HDTV

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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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