Petra, ive tried to factory reset twice to no avail... Altho i may try again due to my screen issue. I've come to learn that this "bleeding" thru of white on my black screens has to do with a brightness issue.
For some reason my s4's brightness is calibrated way too high. The reason i know this is bc ive been testing out brightness controls on screen adjuster apps. When i turn the contrast or bightless to about 60% on the app and then use whatever brightness i want on the device, the bleed disappears completely... Figure that one out...