Question about Vizio 42 in. LCD TV

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Vizio M421VT led lcd HDTV no pic and sound

Tv turns on have sound but no picture

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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tvtek
  • 1284 Answers

SOURCE: Vizio 42" LCD HDTV audio issues

First of all go into the audio menu settings and turn off the "surround" feature off and that should fix the voices/music differences. Does the craking sound appear while watching any sorce such as cable box,sat rcvr or DVD player? If not isolate it to that input and maybe that device is giving the problem.

Posted on Feb 23, 2007

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SOURCE: vizio 47" lcd no picture no sound has power

this could be one of two problem. first, check if you have back light. If you do then the problem is with the M/B. Second, if you don't have back light then the inverter is bad and needs to be replace.

Posted on May 20, 2009

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SOURCE: no picture or sound, light comes on in the front and have to unplug tv to turn it off.

I had this exact problem on my Vizio 47" HDTV. I removed the speakers and all the screws on the back cover. Took the cover off and located the fuses on the largest circuit board. The are in the upper right hand corner of the board. There are 3 of them in a row labeled LF 1.5, LF 3.0 and LF 3.0. The are white in color with copper ends. I took a volt meter and measured continuity across all fuses individually and found the LF 1.5 to be blown. The guy at the electronics store sold me a barrel 1.5A fuse and told me to soldier it across the top of the blown fuse. It took an extra set of hands but the TV works perfectly.

Posted on Jun 23, 2009

milkburp
  • 416 Answers

SOURCE: Vizio 42 in TV LCD HDTV white line across to of

That white line (usually jagged) is actuallly part of the transmitted picture. However, you are not intended to see it because it is located in what is known as the 5% overscan area. Your TVs today are more than just cable ready... they are a versital, technology filled multimedia display. You can see that line because the screen size or wide mode you are using is intended for 1080p/24 signals. You have 0% overscan with this screen size setting. This allows you to see ALL of the picture, including portions of the picture the broadcaster did not intend for you to see. You can change your screen size using the Wide feature in the Setup menu. See pg.62 of your user manual for details and descriptions of the various wide modes.

Posted on Mar 14, 2010

  • 2 Answers

SOURCE: Vizio 42 LCD turns on but no picture or sound

32 in vizio turns on but but no picture only blue screen and cant turn channels up or down

Posted on Oct 21, 2010

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1 Answer

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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There are a lot of references on how to repair the LED backlight. If you can source the parts, google search LED backlight repair.

You may wish to read this first: http://www.techlicious.com/blog/un-repairable-vizio-tvs-leave-customers-out-of-luck/

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I HAVE A VIZIO 42" TV MODEL#: M421VT, THE LOGO FLASHES AND THEN THE SCREEN SHOWS THE LOGO AND THAT IS AS FAR AS IT GET'S BEFORE STARTING OVER BUT THE BACK LIGHT IS ON! COULD THIS BE A BAD MAINBOARD?


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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1 Answer

LCD TV Has Sound, Backlights Work, but No Picture


I have been having the same problem with my LG. people say there are bad capacitors on the power supply board. I don't have the know how to replace them and don't have the money to pay. I can get mine to work by blowing hot air with a hair dryer into the back of my tv through the vents over the board. Heat it up for a couple minutes and turn it off and then back on and the picture comes back. I just never turn the set off now.

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Steve, what is the exact model number of your tv?
TeeVeeMan2@gmail.com

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1 Answer

The screen on my Vizio television went blank. The


if you was trying to wipe your tv off with glass cleaner are something that can make your tv go to a black pic

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2 Answers

Tv screen went blank


sound like the inverter circuit board problem. check & replace back same part# inverter circuit board. hopefully could help!!

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