Weird screen colors and shadows, is there any fix for this? Galaxy S4

[SamaelThuum]

Hi, just bought this Galaxy S4 i9505 everything fine, opened it up to perform some cleaning, seller told me screen was once replaced due to break, but at first glance with bright and colorful backgrounds I didnt notice anything weird. I cleaned prox and gesture sensor was always "1" bc of dust obstructing it, also I think i released the display flex, dont know why, but plugged back, after doing that I noticed weird color representation in dark images, (I DONT KNOW IF THIS WAS HAPPENING BEFORE I OPENED IT, IT COULD) opened and rechecked screen flex, brushed it with dry brush on both board and flex, same thing, I dont really see anything weird on the contacts of either side, already tried all android display settings standard, vivid, etc. Colors look really pale and poor when at dark levels, pixels would just go BLACK if a really dark color is tried to be represented, drastical jump from, for example a dark gray to black, it looks more like normal gray, then black.

[IMG="Drastic shift from dark blue to complete black"]http://i.imgur.com/qWYATaT.jpg[/IMG]
[IMG="You can see in the hair drastically from dark color to full black"]http://i.imgur.com/WsQxh97.jpg[/IMG]
[IMG=""Mind of the virtuoso" video from youtube, check that scene how it looks in your phone, look at shadows"]http://i.imgur.com/OT1RNwp.jpg[/IMG]
[IMG="Mild grey then suddenly black"]http://i.imgur.com/pwLr1Nb.jpg[/IMG]
[IMG="Wrong transition from dark grey to black"]http://i.imgur.com/S9znNDp.jpg[/IMG]
[IMG="Here you can see better"]http://i.imgur.com/ASTWqMn.jpg[/IMG

Ive read AMOLED screens can "get old". Is this? Also, colors get more washed and pale in low bightness setting, if I increase bright it improves a little bit but I hate full brightness. Specially in my bed.

TYVM]

 

[SamaelThuum]

Nevermind, didnt notice the images didnt go well, anyway i got answered in XDA they say its a cheap LCD that was replaced, nothing to do, Ill sell it cheap for like 100usd and get another one testing the screen and all. Thank you.