Question about Vizio VT420M LCD TV

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Vizio VT420M LCD TV - 2 issues

I've had the TV going on 3yrs. For the past 6mos or so, I would get a blue screen when trying to turn the tv on after recently just having used it, but after an hr, it would turn on and work normally. This problem still persists and now there's a new issue. The picture at times is good, showing small vertical black lines 1/8" apart all across the screen. Occassionally the vertical lines turn color and become very apparent and the items in the foreground are discolored by bright accent lines, kinda like looking at a negative, only in color? distorted even more by the vertical lines. When I change channels there is a white line running down the left hand side of the blue screen,about an inch from the edge. I've checked all the connections and nothing seems to fix it.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Discolored lines within picture 32 inch LCD TV

I have the same tv, if you turn up the brightness and turn down the contrast that should help a little bit.... Hope this helps

Posted on Sep 01, 2008

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  • 1 Answer

SOURCE: Vertical Red Line

I had a bright red 1" wide vertical line on the right side of my Vizio P42HDE as well as an equivalent Green line on the left. Sometimes a Blue line would appear adjacent to the red line. Had this TV sinc Oct. 2005. Based on internet research, I opted to purchase an LG 6871QCH060Q board (upgrade to the 6871QCH038A and the 6871QCH038C). Picked the board up on Ebay for $100 + $10 shipping from ShopJimmy parts.

From start to finish, this took about 2 hours to repair. Tons of screws to remove. Took me a while to figure out that the video connection unit in the back is completely modular and needs to be removed before attempting to remove the back cover. Once the cover was removed, I was surprised that I could not see where the replacement board was located. Turns out, you have to go one level deeper and remove the audio board and digital board followed by metal bracket/cover. Once removing the metal cover, the bad 6871QCH038A board was visible. A couple of zip ties will need to be cut as well as several cable connections to get to the 6871QCH038A board. Replaced the board with the 6871QCH060Q upgrade. Make sure to keep the sticky foam rubber isolation pieces and adhere them to the new board. It did take some time to figure out how to disconnect and reconnect all the various types of cable connections. Just take your time. The power cable connector for the 6871QCH060Q board is in a different location, thus I had to reroute the cable. Reassembled and only had 2 unused screws left!

TV workd great. Lines are gone. Have a little burn-in going on where the red line appeared, but still better than forking over $800 for a new 42" LCD 1080P TV. Hope to get a couple of more years out of this Vizio.

One line I found has a general example of LG/Vizio repair manual. Not exact, but close enough...http://www.scribd.com/doc/7580885/LG-TV-Plasma-Training-Manual

Posted on Feb 18, 2009

  • 3 Answers

SOURCE: Vizio L32 LCD tv with video problems

Not exactly an Ideal fix , but running a fan into the back of your tv seemingly corrects this ... cooling failure ?

Posted on Feb 05, 2010

Testimonial: "Good advice! Worked well."

milkburp
  • 416 Answers

SOURCE: Vizio 42 in TV LCD HDTV white line across to of

That white line (usually jagged) is actuallly part of the transmitted picture. However, you are not intended to see it because it is located in what is known as the 5% overscan area. Your TVs today are more than just cable ready... they are a versital, technology filled multimedia display. You can see that line because the screen size or wide mode you are using is intended for 1080p/24 signals. You have 0% overscan with this screen size setting. This allows you to see ALL of the picture, including portions of the picture the broadcaster did not intend for you to see. You can change your screen size using the Wide feature in the Setup menu. See pg.62 of your user manual for details and descriptions of the various wide modes.

Posted on Mar 14, 2010

DrewPalmer04
  • 325 Answers

SOURCE: I just purchased a brand new M420nv 42 HDTV LCD

For sure a defect. You are looking at a T-con board that is faulty. Return immediately and get a different one. If it's within 30 days just swap out and avoid having to wait for a warranty repair!


Please rate if this helped :)

Posted on Mar 09, 2011

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