Question Strange display on Vizio M50-C1

Jan 1, 2021
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I have a Vizio M50-C1 that was given to me by a friend because it did not work. When I powered it on the screen was not the correct display, so I thought the mainboard should be replaced. After replacing the mainboard I see this image:
View: https://i.imgur.com/puutosd.jpg


I have not tested sound. Please advise if anyone has an idea on how to fix this issue.
 
Feb 4, 2021
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VIZIO Experts, I've had my M50-C1 TV since early 2017 and today after I had the TV turned on I also had these pixels in the bottom right corner of the screen.
 
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