Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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Connecting camera/earpiece/Prx Sensor causes touch screen unresponsive

Hi,

I have recently replaced a screen on a phone. Touch screen works fine BEFORE connecting the Earpiece/Proximity Sensor/Front Facing Cam. Upon connecting the Front Cam cable, the touch screen becomes unresponsive.

As a process of elimination I have tried two other screens along with 3 new front cam cables. I thought it may of been the first screen so I fit a new one to the phone to which the issue still persists. I then replaced the original front cam cable with one from Ebay. This caused the screen to go red and fade out to the Apple logo on boot, thus getting stuck in a bootloop. Got sent a replacement part, fitted it to the phone, get past the boot screen and onto the phone, however, I am back to square one where the touchscreen is unresponsive...

I am completely lost with this, is anyone able to shed any light on this for me?

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The problem here is that you have too many variables. If I understand correctly, none of these replacement parts are "known-good". Plus you bought stuff on eBay which is an immediate red flag for me. That doesn't mean the parts are bad, it's just that all of the bad parts end up on eBay at some point. That's the biggest challenge of DIY fixing. Most of the time things work well but when they don't it's hard to know where to go to next.

Before the repair, did everything work properly (minus a cracked screen I guess)? If it did, then you want to try and recreate those conditions. If the original screen and original FCAM flex work properly, then you can rule out a logic board issue. If they don't work, try disconnecting the FCAM flex and work your way from there.

Ultimately, it could be the FCAM flex (defective with internal short), the Screen Assy (bad backlight or LCD drawing too much current) or the logic board (maybe you forgot to disconnect the battery and blew something). That's why I would start with original conditions.

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