Weird lines have been appearing on my iphone. Can anyone suggest a way to fix it?

[Spinstriker Playz]

A few months ago, pink lines started appearing all over my iphone 6 (bought in June or July 2015) screen on anything that was white. I didn't bother much about it at the time because I soon got rid of the lines by turning on night mode (it sets all colors onto a warmer side, so the pink lines wouldn't really affect the white). Anyway, today it got extremely bad. Green lines started to appear. They also appeared on anything white (night mode could no longer stop even if it was set to max). The green lines also appeared on any grayish-white parts of the screen. And to make it worse the pink lines also started appearing on anything that wasn't white but light in color. Before I found the night mode solution, it used to come and go, but when it first came it was there most of the time. It went away only a couple of times. I have no idea whether this new problem with the green lines will ever go away. If it does, it will probably soon come back.
I googled what the problem is, and I couldn't find anything online that had the exact same problem my phone had. It seems to be a unique problem that no one has before. The only thing that I think could or fix or is causing the problem is the LCD cable being or loose or something. It could have something to do with the IOS update, so I'm going to update it. And also since this is an iphone 6, it can't be updated to IOS 13 (apple stopped supporting updates for iphone 6).
And to be clear this does not affect the overall performance of the phone, it's just lines appearing on the screen (touch screen and apps work perfectly fine)
Recap: Weird lines have appeared on my iphone 6 on anything that was light in color on the screen (mostly on anything white).
Edit: I take back what I said about this being a unique problem, I just found a thread from the discussions forum on the apple website, shows a picture of what exactly the problem my phone has (except my phone looks worse)
https://discussions.apple.com/thread/7700107

 

[Lee_Bo]

Edit: I take back what I said about this being a unique problem, I just found a thread from the discussions forum on the apple website, shows a picture of what exactly the problem my phone has (except my phone looks worse)
https://discussions.apple.com/thread/7700107

I suggest you trying the steps in the very first reply to that post.

 

[Spinstriker Playz]

I've tried this many times, and I've just recalled that at the Apple Store they call this a pixels problem. I suppose I should detail how it started. This phone originally belonged to my mom. She that one day she went to a doctor's appointment and when she got back home, the lines appeared for the first time. They soon went away. A while later, she went again and the lines appeared again. She says that it was caused because she was using the hospital's public wifi. After much research and thought about it, I dismissed that possibility because I haven't been in a public place in over a month and it's still there.
Edit: I just updated the phone to a minor IOS update and the lines are still there, but it has slightly calmed down. The problem is still pretty bad though.

 

[Bla1ze]

I've tried this many times, and I've just recalled that at the Apple Store they call this a pixels problem. I suppose I should detail how it started. This phone originally belonged to my mom. She that one day she went to a doctor's appointment and when she got back home, the lines appeared for the first time. They soon went away. A while later, she went again and the lines appeared again. She says that it was caused because she was using the hospital's public wifi. After much research and thought about it, I dismissed that possibility because I haven't been in a public place in over a month and it's still there.
Edit: I just updated the phone to a minor IOS update and the lines are still there, but it has slightly calmed down. The problem is still pretty bad though.

You've done all you can really do. It's a hardware fault. You'll have to look at repair / replacement options.

 

[Lee_Bo]

You've done all you can really do. It's a hardware fault. You'll have to look at repair / replacement options.