Question about Vizio VT Televison & Video

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I have a vizio vt-420m 1080p lcd tv that will turn on to the vizio logo, then shut itself off, not sure what to do, i have been told to replace the main board??? any suggestions appreciated

Posted by colton on

  • colton
    colton Oct 12, 2013

    thank you for the help



1 Answer

Back2life Electronics

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  • Vizio Master
  • 933 Answers

Sounds like a main board issue. Beware, some Vizio main boards can be hard to find and expensive !!!

Posted on Oct 30, 2013


2 Related Answers


  • 27 Answers

SOURCE: Vizio VX42L LCD TV died?

it is the power supply. in the given scenario like yours, the PSU is the suspect in 90% of the cases.

Posted on Apr 09, 2010

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  • 19396 Answers

SOURCE: 42" Vizio - no picture no sound

If the TV goes in standby, then it is in protection mode.

Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , starting the flashing light.

If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |

On LCD Pay particular attention at inverter and power board, power board can be inspected looking for bulged or leaking capacitors, then tested with a multimeter. The inverter is more difficult to test , there is need to read voltages, should be done by a tech. Also the LCD controller board can cause same problem

Posted on May 04, 2009

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Related Questions:


I have a Vizio E472VL television. When I go to turn it on the logo appears on the screen and the "vizio" icon back light turns on, but nothing else happens. I have tried coax, component, HDMI, etc..

Had the same thing happen to my Vizio TV. It was on warranty, and they replaced the motherboard. It's been fine since then. There appear to be only a very few parts inside. Power supply, motherboard, and display. That's it. Your power supply is good, as is your display. You just need a motherboard.

No picture or sound

Its the main board 90% of the time when a vizio has that symptom.

E390vl turns off after vizio logo

The main board is bad. You can get the replacement main board from

Vizio 1080p e420vo turns itself off about ten seconds after i turn it on why

There is something wrong with its main digital board. Check it. Might need replacement.

Upon powering on my xvt47sv Vizio TV, Vizio logo is constantly shown on screen (after 60 sec that vizio name blinks at the bottom) but the Jag wheel and remote are unresponsive. then after 2 min the TV...

The main board of this Vizio is known to fail after some use.

Its number is CBPF9D1KZ4 and as you will see it is hard to find, unless you want to pay $250 or so, which doesn't make any sense, at least to me.

Another common failure in those is the T-CON board, but from the sound of it the problem you have is in the main board.

Here's what I'd do if I were you: post a local ad on Craigslist, sell it to the highest bidder and use the money towards puchasing a new TV.

Not sure it's what you want to hear, but it's what I tell some customers and thus losing business that I couldn't have had anyway because it's insanely expensive and prone to more failures anyway.

If it helps you please vote for me - it helps me in turn :-)

Hey there, I have a 6 month old vizio 32" LCD 60hz

LCD inverter module may have encountered a failure. Most common is an electrolytic capacitor failing in the power supply. Examine the board to see if any of the caps have a bloated or raised top, they should not be swollen or leaky. If so find the replacement capacitor # on line and replace. You will require a modicum of soldering skills. You indicate the tv is 6 months old.
Return it for warranty service, do not open your tv or you will void your consumer warranty.
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