Turning up display brightness makes phone glitch
So I've recently swapped out a logic board on my old 5s and replaced it with a friends board however, after putting his logic board in we came into a problem whereby if we increase the display brightness the phone would become unresponsive and you would have to put it on standby mode and power it back on to regain responsiveness. In the scenario that you would put it up to full brightness the screen would darken and lines would appear.
Any reason as to why this would happen? The display assembly was working completely fine when I had it for well over a year.. It's also good to note that I had the phone on for a whole week before he got the phone and entered his password and from there we saw the issue.
Is this a good question?