Question about Vizio Televison & Video

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M420NV Hello.. I have a Vizio M420NV LED TV. and when I try to power it on the logo light changes from orange to white and I hear sound but no video. I tried looking at it in a dark room and there is no back light at all and this happens on all sources. Any ideas?

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  • Vizio Master
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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.

Posted on Apr 24, 2013

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Posted on Jan 02, 2017

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SOURCE: Brand new Vizio VW46LF acting strange.

If possible, I would suggest returning it and get another new one.

Posted on May 16, 2009

  • 1 Answer

SOURCE: vizio gv47lfhdtv10a no picture no sound

Well guru way to help him out with his problem maybe he doesnt have the money to just run out and buy a new one...

Posted on Mar 21, 2010

Raditronic
  • 196 Answers

SOURCE: plugged in orange light turno on vizio light is white no picture

possibly is the main board.

Posted on Apr 30, 2010

  • 4 Answers

SOURCE: Vizio m550nv led lcd tv. Problem began a couple

I had same problem. Unplug set for 10minutes then plug it in and let it go thru it's startup routine.

Posted on Jan 27, 2011

ginko
  • 19396 Answers

SOURCE: VIZIO GV42LHDTV Got TV after

Hi.

If the TV does not start with the new audio board, and if it does start with the old one, then the audio board that you recently purchased is defective.

About the board : 0500-0507-0230; that is the power board (PSU). If you could see the Vizio logo, that means that TV started, and that the power board was OK without need for testing. When the power board is defective, either the TV does not give any sign of life, or the TV goes in standby mode from start and does not wake up. In that case the led stays blinking to warn you that there is an incorrect voltage from PSU.

If the TV is freezing with Vizio logo, that means that at most the faulty part is the main board.

Also, you say that there is no backlight. No backlight means that the screen is completely dark. If there is no backlight you won't be able to see the logo or any other picture.If there is no backlight, then the problem is usually the inverter.

Here a brief article summarizing how to test PSU and inverter: How to test an LCD TV.

Here all parts for this model:GV42LHDTV.

Regard.

Ginko.

Posted on Feb 11, 2011

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Found a Vizio VO42L By the dumpster and want to try and repair it. I plug it in and the orange logo lights up, press power and it turns on and the logo lights up white but picture flickers with horion


Sounds like it might be a solder joint. use the meter and check the ohms on each side of the solder joints on the board where the serial cables connect to the boards. it would be a good idea to check as many joints as you have time to. If it is a LED TV check Led control board for bad joints. if it uses Flourocarbon tubes check the transisters on each lighting control board. you may only have one board working causing partial back lighting.

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I have a suggestion if you have and are using a box of some kind with this set, remove set and box from power for awhile and then power both back, sometimes a box can trigger this type of event, hope it helps and it cannot hurt to try.

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

peace .

Apr 21, 2017 | Televison & Video

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 m470nv will not come on, logo blinks orange to white.


It may not be the caps at all, a lot of the new LED Back-Lit TV have faulty LEDs. They short and pull down the power supply, and to a novice it will seem like a bad power supply. That means that you must replace the bad LED's in that particular LED strip before you can fix the problem. Not an easy repair for a rookie.

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47"Vizio model #XVTSV Led LCD


this is the only way to get rid of the orange light: l3_3_in_hdtv_lcd_television_412611.jpg
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Problem with Vizio L32 32 in. HDTV LCD Television
how do i turn off the orange light on the vizio tv, it won't go off after the tv is turned off?

Posted by avatar1.jpgmeg_car on Jul 08, 2009



Vizio TV Repair Power supply troubleshooting Picture problem Sound problem
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Solutions (2) Best Solution That little fella is only turned off by unplugging it. If all those little lights in America could be turned off we could do with one less nuclear power plant. If unplugging it is not an option, my wife's solution is to cover it with a piece of black tape.

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remove all screws on the back of the tv, carefully pull off back cover. you will see two circuit boards one on the left (Power) and one on the right (Video) on the Video board there is a small plug on the right side with a yellow, white and red wire going into a small white connector. the red wire is what controls the orange light on the front. now that the plug is pulled turn it over and you should see a small white plastic piece that holds each metal connector on the end of the wires in. pry this piece of plastic up for the red wire and pull at the same time, the wire will come out of the connector. now tape the metal connector with electrical tape and tuck it behind something or tape it to the chassis. plug your connector back in. put the rear cover back on. now your tv will only show the vizio logo in white when you have the power on. If you wish to disable the logo for both orange and white just disconnect the white plug completely.

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2 Answers

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fualty capacitors you say after a while it stays on theres a full charge in the unit theres some type of discharging effect on the set after its off for a while. voltage goes to low or unstable after it is off for a while. your better off getting the service docs for this set if you want to diy..other wise get a tv tech to check it for you. hope this helps

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