Question about Vizio 42 in. LCD TV

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Vertical lines on vizio vo420e - Vizio 42 in. LCD TV

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  • Vizio Master
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Thats usually caused by the Tcon board. You can get the replacement inverter board from

Posted on Dec 30, 2012


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Posted on Jan 02, 2017

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SOURCE: I am considering the purchase

Yes it does suport the hdcp. you can see the specs here on link below.

Posted on Nov 22, 2009

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SOURCE: Vizio VO420E " TURN ON, tv is showing no picture

It can be the main board, power supply, backlight inverter, etc.
You need to do some troubleshooting to narrow down the probelm, so please read my guide first.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
Failed TV and Monitors:

Learn about bad caps:

Capacitors kit: he can make you a set of caps.
Or just make sure to use caps with low ESR, 105c rating such as PANASONIC FM or FC series.
Please post back what you find.

Posted on Nov 25, 2010

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SOURCE: can i replace a vizio screen model #VO420E with a vizio screen model #VO42L FHDTV10A?

Hopefully you did not try to take the circuit board from the broken LCD and graft it onto the good one - the possibilities for problems are enormous.
Double-check all of the connectors, then compare the model numbers of the main board and power supply between the two sets. The cable between the LCD and the main board is often rather fussy and delicate - DO NOT pull on the wires! You may have to swap cables also. If the main board is different, try the one that went with the good panel (from the VO240E), and hope that part is good.
Note: electronics are susceptible to damage from static electricity. Handle the circuit boards only by the edges, and try to maintain contact with the metal shielding parts as much as possible (an anti-static wrist strap is a good means) while working on the set to discharge any static buildup on yourself.Once you are done, there is an e-Bay market for the remaining parts. If you have identified the bad board from the VO420E (by elimination), you can get more for the others, and you may still be able to sell the bad one to a reconditioning company, who will repair it and resell it.
The worst case situation is that the LCD panel driver board is bad, but as I understand your situation, the VO240E wouldn't turn on anymore. That is usually a power supply problem.

Posted on Dec 11, 2011

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Hello, David -

For one thing I do not believe your model of Vizio TV is a Smart TV.

See the specifications for your model (first manufactured in 2009) here:

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Sep 13, 2012 | Vizio VO420E 42 in. LCD TV

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Half my screen has vertical lines

it sounds like one of the upper flex tab bonds on the set may be the issue. Thats usually whats at fault with that type of symptom.

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Vizio VO420E 42 in. LCD TV -- Less than 3 months old. Picture slowly darkens and then goes out all the way. Sound stays on. Picture goes out. We turn the TV & cable box off, wait 30 seconds, turn...

the problem its the main board of the tv not the power supply board.the main one controls all your imputs tv av component etc the cheapest place to find it its at cheaper than the manufacturer and those dudes that you find online that charge an arm and a leg just to come and just repair your old main board mine as well buy a new one at this site for less ok and you are welcome

Apr 13, 2010 | Vizio VO420E 42 in. LCD TV

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