Question about Vizio SV421XVT 42 in. LCD TV

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42" Vizio 240Hz SV421XVT no hdmi video or audio

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  • Vizio Master
  • 14,553 Answers

Possible bad source, bad cable or connection was made with units powered up which HDMI does not like.

First thing to try in this case is to remove power from set and whatever unit is connected via HDMI and disconnect the cable itself.

Wait for several minutes, connect HDMI again and THEN return power to the units that were removed from power, this cannot hurt and may help or correct this issue.

Failing this try if possible to connect using component connections.

Posted on Dec 10, 2012

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Posted on Jan 02, 2017

SOURCE: no video/picture

Solution is to get it fixed (hopefully under warranty).

I have the same issue after owning the Vizio 42" LCD for just 5 months. They are coming to replace the part this week. I will also be purchasing the extended warranty as well, to avoid this problem in the future.

Posted on Sep 15, 2008

SOURCE: vizio vw42lhdtv10a 42

check out the power supply board! Look for popped capacitors. They either leak or swell up. They are the can shaped things on the board with the plastic coverings on them...you can usually see a swollen cap sticking up over its covering as a telltale sign.

Good luck and be careful

Posted on Mar 16, 2010

  • 8457 Answers

SOURCE: My Vizio 42" LCD SV421XVT

U getting a non respones from ur remote or the manual side panel tv controls buttons wright.U already tries resetting it back to factory setting.But the problems still the same.Yes,the tv Tuner signal board is the causes and the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Tuner signal board for the replacement.

Posted on Dec 11, 2010

  • 11800 Answers

SOURCE: Vizio 42" HDTV. Video will frequently scramble and

The image processor - the one that generates the image from the data on the channel signal - has failed. You must replace the entire LCD controller board - the one that has the processor. Here it is
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330433731222

Posted on Feb 14, 2011

eagle338
  • 4889 Answers

SOURCE: Vizio SV421XVT won't turn on.

When you say it does not turn on, do you mean that the LED at the front indicates its on but there is no picture or sound or is it stuck in standby mode? Please provide this info so that I can tell you what the problem is and how to fix it.

Posted on Jul 03, 2011

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1 Answer

What size screws hold the back cover of a Vizio sv421xvt tv? I am not talking about the screws for the stand.


If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Disassemble & reassemble procedure to many popular brand TVs and other devices are given in detail with illustrations.

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1 Answer

Two vizio TV's with issues


Take them to a TV repair centre as they are complex to repair. You may find that your homeowner insurance will pay for the repairs if you can demonstrate that it was a power surge that damage them.

Feb 29, 2016 | Vizio SV421XVT 42 in. LCD TV

1 Answer

Screen freezes, and buttons don't work!


It sounds that the main digital board to your TV has the fault. To check and locate the fault to this board is a very skilled work. Contact any service technician.

May 28, 2013 | Vizio SV421XVT 42 in. LCD TV

1 Answer

Vizio sv421xvt issues


It sounds like a main board issue but could be a power supply issue. I will tell you from my experience with Vizio TV's, main boards are more likely to fail than power supplies. But to be sure, you will want to either get a diagnoses or if you're handy do a little troubleshooting. The power supply and the main board are not cheap so you will certainly want to be sure before spending any money.

Nov 24, 2012 | Vizio SV421XVT 42 Class LCD HDTV - 1080p,...

1 Answer

Problem with Vizio SV421XVT


I am also having the same symptoms for my SV421XVT. TV works great except all HDMI ports are not receiving signal. Devices work through the AV Ports, and TV reception is fine. New Roku box is also not working through HDMI but works with AV. Wish I had a solution to this.


On a another forum for another TV it was suggested that boards need to be replaced. I hope I can get these boards for a reasonable cost.

Aug 16, 2012 | Vizio SV421XVT 42 in. LCD TV

1 Answer

No Audio in HDMI THRU Onkyo HT-R380 Receiver


Hello, I am sorry about your issue. I suggest that you contact us at 800-229-1687 option #3 so that we can troubleshoot with you. Thank you, Onkyo USA

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1 Answer

My Vizio 42" LCD SV421XVT


U getting a non respones from ur remote or the manual side panel tv controls buttons wright.U already tries resetting it back to factory setting.But the problems still the same.Yes,the tv Tuner signal board is the causes and the problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Tuner signal board for the replacement.

Dec 11, 2010 | Vizio 42 in. LCD TV

1 Answer

My vizio 42" all of a sudden lost sound on the


I can see good video, but I hear no audio with my XWH200 adapters?
Published 11/21/2011 06:46 AM
Updated 11/21/2011 02:26 PM
While most HDMI sources work with good audio and video, we have a compatibility issue with audio from a few specific products (eg, DirecTV HD DVR satellite set-top box, DISH Networks satellite set-top-box, and TiVo Premiere XL cable set-top-box). If you are experiencing problems with no audio or muted audio with one of your HDMI sources, then please try changing the audio settings on your problematic HDMI source to PCM or LPCM. Then turn off the TV, remote power from the WirelessHD adapters, and power off the HDMI source. Now power everything back on. If you are still experiencing no audio then please write down the model number of your HDMI source with no audio and contact VIZIO customer support.

Oct 27, 2010 | Vizio VW42LF 42 in. LCD HDTV

2 Answers

HDMI ports stopped working. Only get a blue screen. Can only watch TV through AV.


If you have a cable box, then you have to pick the right source. So on your TV remote you need to pick the source button and then scroll down to HDMI 2 as the source. HDMI 1 is the blueray device. HDMI 2 to watch TV

Apr 11, 2010 | Vizio SV421XVT 42 in. LCD TV

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