Question about Vizio VX42L 42 in. LCD TV

1 Answer

Vizio logo does not light up amber when plugged in but turns white when power button is pressed. no picture or sound. Big Transformer on power board makes a light buz sound when plugged in also.

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  • Kennith
    Kennith Apr 14, 2015

    Thanks for the help, both inverter boards were shorted.

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  • Vizio Expert
  • 264 Answers

1. When the TV powered up, please measure the 24V, 12V & 5V are there, if one voltage is missing, you may have a defective power supply.

2. If the power supply lost the 24V source, you may unplug the power supply connector on both the inverter board, then power it up, if you got the 24V back, you do have a defective inverter board, you may unplug them one at a time to locate the bad one.

3. If the power supply & inverters are good, you may have a defective main board. The common problem on the main board is that a voltage regulator is bad, you may use your millimeter to measure them 1 x 1. The out put voltage (on the heat sync) should be 1.25V + the control voltage (Pin 1), for example: if the control pin voltage is 0, the output voltage should be 1.25V, if the control voltage is 2.05V, the output voltage should be 3.3V, if one of them is out of range, replace it, you may find the part from Digikey Co. The part number printed on the regulator is AMC1117.


Good luck!

Posted on Apr 08, 2015

Testimonial: "Thanks both inverter board were shorted. Waiting on parts."

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: No Sound, No Picture

I had the same issue on my Vizio and fortunately it was still covered by the Costco extended warranty from where I purchased my tv. The service tech came out yesterday with a power supply and main board which is what I understand is usually the issue with your and my symptoms. He replaced both boards although he felt the issue was in the main board 3647-0072-0150 and not the power supply. Tv is working just fine now and actually may be even a little clearer after the board switch. I understand you can purchase the boards and from what I've seen the tech do, it is no more difficult to replace than if you were building a computer if you are comfortable with that. The most time consuming part of the repair was removing and replacing the screws.

Posted on May 17, 2009

  • 92 Answers

SOURCE: Power Light comes on but no picture or sound.

for your VP50, it could just be simple as a power supply but it could also means more. Do you have the amber LED light when off and green when on? if so, try the main board first. If that doesn't resolve the problem, then change the sustainer boards.

Posted on May 30, 2009

  • 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

Testimonial: "alteans is very helpful."

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

freetek
  • 5568 Answers

SOURCE: My vizio e420vl turned itself

There are at least two power supplies in any set with remote capabilities; one is on any time the set is plugged into AC and is supplying that indicator and the receiving circuit of the remote, otherwise it wouldn't turn on under normal conditions. The second power supply produces the needed service voltages used when the set is in use. This second supply is a common failure in many sets and it is generally traceable to poor design and the use of low-quality components of a certain type. Vizio may have a repair or exchange program through their service center. I would guess the cost will be between $50-$150 and you might remove the back panel of the set and look for a smaller board with larger-than-average parts on it and is related to the AC cord coming in. It should be fairly easy to remove and replace as these are often outsourced and just plugged into the rest of the set with dissimilar plugs making it simple to install and reinstall.

Posted on May 29, 2011

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http://electronicshelponline.blogspot.com/
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