Question about Vizio M420VTB 42 in. HDTV

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Vizio m421vt no picture no sound

The screen went black and the sound turned off. When I plug it in the vizio logo blinks for a while and then the unit turns off. I can turn it back on using the remote but it powers off after about 1 min.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 155 Answers

SOURCE: Vizio 42", have picture for about 5 mins then screen goes black.

also check the power cord wire coming from the back of the tv is loose from the tv side or perfect.

Posted on Oct 26, 2008

  • 3 Answers

SOURCE: only vizio light on

why should i tell you (fixYa) how i fixed the problem for free? You wanted to charge me for your info so i think it's only fair that i charge you for mines. I did figure out and solved the problem.

Posted on Dec 31, 2008

  • 4 Answers

SOURCE: only vizio light come on then nothing. have to unplug to turn off

there a problem on power side.. chage the ic and the resistor going to ic and check also the signal diode.

Posted on Jan 03, 2009

  • 13 Answers

SOURCE: Vizio VW32LF powers up no sound no picture unplug to turn off

I had the same problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound.

HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

Posted on Jan 22, 2010

  • 1 Answer

SOURCE: We have a Vizio model # GV47LFHDTV10A. When we

For the cheap guy like me who will probably do more harm than good:
Also check for the F3 Fuse on that same main input board. It is located in the upper right corner. Hard wired fuses; very small. You will see F1-F4 (F4 is empty). You can solder a replacement fuse right over it. I would recommend piggybacking the fuse with a fuse you can replace. Will need the holder and a new fuse. 6 bucks.
Doesn't solve problem, but I can go another 2 1/2 years and the wife won't blame me for screwing up the TV in the first place.

Posted on Feb 14, 2010

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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


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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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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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I have a Vizio XVT3d474sv. My TCON went bad, only one side of the screen was working. I ordered a new TCON for it. I had been checking over other things and was lightly tapping areas to see if somethi


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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If recently bought, take it back as a default.good luck..

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I had a similar problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. I didnt hear an arcing sound though. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound. I would check the ceramic fuse first on the board that gets power from the plug.

HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

Jan 13, 2010 | Vizio VW42LF 42 in. LCD HDTV

1 Answer

The LCD screen is dark with no sound or picture when turned on.


I had the same problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound.

HOW I FIXED MINE:Look through the back vents for a white light to make sure the backlight still works. I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine. I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

For me the part number was either (depending on the vendor) : 0171 2272 2174 or it was 3632 0212 0150. Check your circuit and see if any of those numbers match up.

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3 Answers

Vizio VW32LF powers up no sound no picture unplug to turn off


I had the same problem after having a Vizio for 2 and a half years. I left the room for a minute, i came back and the screen went black. There was still power to the unit and you could see that the back light was working, just no picture, no sound, and you couldn't use any of the buttons. The only way to turn it off was to unplug it. It would then start up, with the Vizio logo going from orange to white, and then do the same thing all over, no pic or sound.

HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com (you can also use searspartsdirect.com). This is the circuit board with all of the inputs on it (hdmi, cable, etc.) I opened it up, disconnected the old one, put in a new one and now it works fine.I used both serial numbers on the board to search for it online. It cost me $144 to do it, but that's better than $450 for a new TV. My tv is the vx32l hdtv10a. I hope that helps.

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