UI 8

[Cas4pf]

It appears to be there's a tiny green horizontal line on my phone screen all of a sudden.

But not quite long after I updated my software update to UI 8.

[SamsungModerator1 · Accepted solution]

Hey Cas4pf! Thanks for visiting the Community. An unclear display can be infuriating. Let's get this situation taken care of as soon as possible.

First have you tried the best practices for after an update.

Best Practices After an Update - Samsung Community - 3200871

Second, I recommend giving this link a shot: http://www.samsung.com/us/support/troubleshoot/TSG10001447/

It says pink lines, but the steps are the same.

If this does not help I recommend letting a service technician have a look. As we would like to gather additional information, and look at this from a case by case basis, please provide the full model code and serial number of the device as well as your best contact phone number, name, and email. 

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If your unit is out of warranty and you would like to receive quotes on service/labor from an Authorized Service Center near you, please visit:

http://www.samsung.com/us/support/service/location