The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

3664 Questions View all

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.

Answered! View the answer I have this problem too

Is this a good question?

Score 1


Did you try reseating the display flex connector?


Yes I've plugged in and out the connector, also done a hard reset


Add a comment

1 Answer

Chosen Solution

Screens can go bad just from taking it out from a phone. It's very rare but it happens.

Lines appearing usually mean either damaged ribbon cable or screen LCD ribbon cable not connected fully to logic board.

Was this answer helpful?

Score 2


The wierd thing is that the lines only start to appear after half the total brightness, the more brightness the more lines. If you stay below half, it will work perfectly fine. Also there’s no auto brightness toggle in settings - iOS 10


The auto brightness toggle was moved under another area in settings.

If I'm correct its settings, general, accessibility, display, auto brightness.


Hey Ben it’s running iOS 10


Oh, if its iOS 10, then I'm not sure what's going on.


Add a comment

Add your answer

Kevin Thomas will be eternally grateful.
View Statistics:

Past 24 Hours: 3

Past 7 Days: 16

Past 30 Days: 56

All Time: 243