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Vizio m420nv has no sound or picture

Vizio m420nv sn# la2kgual14502526 have checked fuses one has alternating voltage 0 too .14 ,one has 5.24 and the other .126 also regulator position u4 has 3,26v ,1.24 on center and 0 on output no backlight at all can turn on and off with remote changes from orange too white have looked at it in complete darkness not even a flicker of light anywhere other than the vizio light, any sugestions would be great and location of part to check or description as to where it is on the tv as not knowing names of parts under back cover thanks Bill jmcgrew001@carolina.rr.com or ph 910-206-2468

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Unplug TV, take off the back. One each board there will be capacitors. the tops are flat unless one has blown then it is bubbled up. If you find one that is bad, copy the number and search the internet for a replacement. Unsolder and remove the old one ( there is a line drawn on the negative leg, mark the neg side on the motherboard so you can replace the new one the same way). Now solder the new one back onto the board. This worked for my TV, hope it helps

Posted on Jun 01, 2017

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High there!
I want to try this, change the video card ( video audio section ) of the TV

peace .

Posted on May 08, 2017

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SOURCE: volvo V70 electrical problem

had the same problem with an s80 this week- no warning lights nothing. was the regulator. when you have it fixed cancel all the trouble codes as when voltage is low everything registrs low signal input and makes the car go into get me home mode.

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how do I remove a alternator from a 19988 honda accord?

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SOURCE: Front and center console 12v accessory power outlets not working

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SOURCE: 1972 Ford F100 Alternator/Voltage Regulator wiring

Here is what you need.

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Please rate this a fixya

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SOURCE: 2000 Ram Van - is the voltage regulator located in the alternator

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Posted on May 26, 2010

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1 Answer

I have a 42" vizio model # m420nv . It has a good picture but has three stripes from top to bottom 6" wide where the picture is a lot brighter . How do I fix this problem?


If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Jun 25, 2015 | Vizio Televison & Video

1 Answer

Wel the Vizio Tv lost Sound.


Check whether the audio is muted by accidently. Enter its sound menu, and check it. If muted, as you know there will be no audio output. If not muted, check the speaker/s. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, 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. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Nov 07, 2014 | 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 has sound but no picture


Hello there

Actually that problem is very common on all LCD TV,, that problem is cause of either inverter board or t-con..

In this case you don't need to check the voltage that is too complicated for you,,only visual check is enough..

I share you my tricks and hope it helps..

Power on your TV turn off your lights..if you will see the light comes from the screen the problem is t-con..if no light the problem is inverter board (backlight) board

Hope it helps..

Don't forget to rate..

Aug 25, 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

2 Answers

I am connecting Yamaha DVD player to the Vizio M420 NV via HDMI. i have a picture but no sound. how do I gain audio when using HDMI?


HDMI has both Audio and Video (High Definition Multimedia Interface) and should carry both. However, I had this problem with a client just the other day and it turned out that the firmware on his TV needed to be up[graded. Different model TV, but I believe you may need to download the latest software/firmware update via your PC and put it on a flash drive and then flash the firmware on your TV to get it to work. Sorry I don't have the specifics; I was stumped and the Time-Warner guy ended up doing it. I hope this at least sends you in the right direction.
James

Apr 17, 2011 | Vizio Televison & Video

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