About a month ago (I've been using my old iPhone 4 ever since) in the midst of texting my iPhone 5s's screen went super dim. It's so dim that about the only way that you can see the screen is in a pitch black room. All the rest of the software seems to be operating properly. I tried the obvious remedies first (adjusting the brightness settings, rebooting the phone, etc.) all to no avail. I called Apple support and they said to bring the phone in to the Genius bar. Unfortunately I found out there that they couldn't perform any work on my phone because the previous owner had opened up the phone which voided the original warranty :/ So I decided to try taking it apart myself. I did it just once to see if unsnapping and then snapping some of the ribbon cables back into place would do the trick. No dice. Then I tried replacing the light sensor. That didn't work either. The screen is still very very dim. At this point I don't know if it's worth it to just give up on the phone or if there's still something to try. I don't know if replacing the screen would do anything. Does anyone have any ideas?