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I've got a Vizio L42HDTV10A with a bad Main Board. I had a technician at the house measure voltages to/from the power supply. I've seen in a lot of phongnv- posts reference to failed main boards. What is the reason these Vizio main boards suddenly fail? Are they very sensitive to surges? Does the main chip get too hot and form cracks in the solder joints of the ball grid array? Post after post, within related failure symptoms, you keep advising to replace the main board. How about an explanation of what is failing. Maybe there is a preventative if the main board is sensitive?

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You can look at the various module failure symptoms and service / replacement options for the L42HDTV10A here:
http://www.coppelltvrepair.com/search?Q=l42hdtv10a&As=false&Pf=&Pt=&Sid=false&btnsearch=Search

Posted on Apr 25, 2013

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Yes the main chip got too hot..you better put it blowerfan inside.thats the best solution

Posted on Sep 07, 2010

  • quirmche Sep 07, 2010

    Do you know of a cpu fan or a heat sink that will vent this chip?

    Also, it looks as though the chip itself was setup for a fan attachment by the etchings and holes on the main board, why do you think they didn't put on/ wait,... I know $$$$$$$$$$ money...cut costs!!!!!

  • arn alipan
    arn alipan Sep 08, 2010

    yes i know ...it depends on how to install.technique and experience is better than to discover.

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Posted on Jan 02, 2017

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1 Answer

I have E420I-A0, 42"LEDtv wont turn on.Replaced the power board.The power supply board receives ~3v&12v from main board,when On button pushed,no Vizio or LED light or pic or sound. Main board bad?


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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I have a Vizio e500i-A0 TV, no picture but some flickering. Voltage on LED 1/2=260V! Bad LEDs or power supply board?


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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1 Answer

Vizio e390vl standby and on status good no picture.


The power supply must provide 12V as well as 5V. Your power supply module may be damaged. did you measure the voltages in circuit or after disconnecting the circuits. When no load is present, the power supply outputs must show 12.5 V and 5.3V. You will need to replace the power supply module if these voltages are not present. The main board may not have been the problem in the first place.

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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.


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!

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1 Answer

Power wont turn on


If the front light [Power LED] is on, the power supply you have replaced is working, means, the 5V supply rail is OK, and the main system control do get voltage. But, to get a start up to another voltages from the power board, a control signal should come from the main board; which do not come now. You have to check the reason.
Checking mother board (main board) is a skilled work, as you might have seen its structure and complicated component layout.
It will be best to contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/

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1 Answer

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I've seen that problem before and for this person it turned out to be a bad ground on the outlet they were using. I've also seen waiting for it to turn it self on after its on off fit sometimes works.

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1 Answer

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Check for bad capacitors in power supply, check voltages coming out of the power supply, if voltages are good, bad main board.. Vizio's are notorious for bad main boards.

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2 Answers

My vizio L42HDTV10A mfg date:november 2006 turns itself off about 5 secs after I turn it on. Is it fryed or can this be fixed?


it can be fixed the problem is in the power supply..but since the tv is old my advise is to buy a new one as it will cost you to get it repaired.if not then get a repairman to do the job.good luck.

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