Question about Vizio m420nv 42 in. LCD HDTV

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MIRROR IMAGE ON MY VIZIO M420NV. aFTER TRYING TO UNPLUG AND REPLUG TO NO AVAIL. IR CURCUIT BOARD AND CABLE WERE REPLACED ON 7/9/2012. pICYURE WAS ok UNTIL 2 MONTHS AGO. NOW IT IS MIRROR IMAGING AGAIN. UNPLUG, SET BACK TO DEFAULT SETTINGS SEEMS TO WORK BUT DON'T KNOW HOW LONG THESE FIXES WILL WORK. nO HELP FROM VIZIO TECH SUPPORT. THEY GAVE ME A NUMBER TO CALL FOR REPAIR AT MY OWN EXPENSE AGAIN.

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Posted on Jan 02, 2017

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SD Tech
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SOURCE: Mirror image - can't fix

It likely has a problem that has affected the microprocessor in some way which might be explained if you had a power outage?

I would suggest if you have not done so to unplug it for a while and turn it back on after a hour.

Also call customer service at Vizio and inquire if this is a known problem and if there is a possible software upgrade to correct and restore the set to original shape.

It can be a pain to call and wait on the phone and is hit or miss as to seeing if the person who tries to help knows what they are doing or not.

If they snap an answer "you need to take it to a shop" persist and try to talk to a technician.

Posted on Mar 22, 2012

Testimonial: "Thank you and even before I read your response I tried the old "unplug for 30 seconds" routine. I assumed my boyfriend had already tried that out. Anyway it worked and things are fine now. We had had an electrical storm that day and there was probably a power surge. The Vizio wasn't on a surge protector but is now. The Vizio repair people/ call center people were very nice and helpful although we (fortunately) don't need to go that route. Stephanie"

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1 Answer

My Vizio m420nv tv the left half of the screen has a yellow tint throught the whole screen. the right hand side is fine. Ive changed the T Con Board and didn't change anything. any ideas?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

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If your are referring to the image (reverse video, ie, every one is left handed, wording on ticket tape backwards etc.) on your TV, the problem is in the signal board. Generally unplugging and plugging in the TV will not reset the TV. Just repaired a TV with mirror image. You will need to replace the signal board. The signal board has all the rca component jacks, hdmi, audio, and the RF connection for cable or over the air signal. Thanks for asking me.

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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.

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1 Answer

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2 Answers

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

peace .

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1 Answer

Mirror image - can't fix


It likely has a problem that has affected the microprocessor in some way which might be explained if you had a power outage?

I would suggest if you have not done so to unplug it for a while and turn it back on after a hour.

Also call customer service at Vizio and inquire if this is a known problem and if there is a possible software upgrade to correct and restore the set to original shape.

It can be a pain to call and wait on the phone and is hit or miss as to seeing if the person who tries to help knows what they are doing or not.

If they snap an answer "you need to take it to a shop" persist and try to talk to a technician.

Mar 22, 2012 | Vizio m420nv 42 in. LCD HDTV

1 Answer

The LED vizio comes on the front of the tv...........screen is blue with floating signal saying No Signal!.


Tries unplug the tv and the cable or satalite boxes too.Replug it all back like an hour later.The tv know will reset itself back to the factory setting.The cables or satalites boxes it upgrading it softwares.The tv should have incomming broadcasting signal and work now.Not,call the cables or satalites compannies to replaced those inputs boxes first,have the same problems with those new input cables or satalites boxes.Than the tv,the Tuner signal board have problems and the cause.That the board,where the incomming broadcasting signal cable plug into it.That the tv Tuner signal board.Tries websites Shopjimmy.com,Ebay.com to buy a whloe refurbish Tuner signal board for the replacement.

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