Question about Vizio VO42L 42 in. LCD TV

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Vizio M421vt no picture

No picture

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If audio is OK, the fault should be with its backplight inverter baord. 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. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Posted on Apr 22, 2014

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Posted on Jan 02, 2017

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My vizio model# E480-B2 was working fine one day and the next when I turned it on I have no picture.. Perfect sound ! Does anyone have any ideas?


Hi , The link below is a YouTube page full of videos showing how to fix a Vizio television NO picture GOOD sound, I hope this helps....... CHEERS..
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most likely thing is the mainboard has failed and they run someplace around 300.00 to replace .many new sets cost less

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When i turn the set on i get back lighting but no image or sound.


Fault at 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. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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I have a vizio m421vt when it comes on just the vizio lights up , black screen, can't get sounds, no backlight, buttons on tv dont eork have to unplug from wall


Same thing happened to my Vizio TV. Fixed under warranty, replaced the motherboard. There are actually only 2 boards in the thing, easy to fix.

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I own a Vizio 42" flat screen tv, model number M421VT and every time I plug it in, the Vizio logo at the bottom begins to blink white, it will do that for about a minute and then the symbol will appear on...


Check for signal input at the HDMI port or Coaxial connection. Check your cables or try a different one. Be sure your signal source is handshaking with the TV set.

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Here is what I would do. Do a google search with the model of the TV with a short description of the problem and hopefully it will lead you to a solution. Unfortunately repairing these TVs that can be bought new for less than 400 dollars is usually not cost effective.

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If the backlights for the screen do come on and you also have 12v and 5v feed the main board then it does sound like the mainboard will need to be replaced.

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