4-inch iPhone released in March 2016 with similar hardware specifications to the 6s. Available in Silver, Space Grey, Gold, or Rose Gold with 16/64 GB storage options. Model A1662 and A1723.

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Why won't my screen respond properly?

I recently had to replace my LCD and Digitizer after I broke the screen. I've gone through 4 screens now, 2 of them were from a cheap place and while the digitizer portion worked 100% the LCD was distorted so I ended up returning both of them and got a screen from iFixit, this time while the LCD was crystal clear the touch function was acting up a bit. As in it didn't respond to the tips of my fingers, just the centers, unless I pushed down very hard or slid my finger from the center to the tip. After explaining the issue another screen was sent out to me. After plugging this one in it seems to be doing the same thing, though, not as bad. It now responds to the tip of my thumb but no other finger tips seem to work, this makes it quite hard to type, it also seems to not respond to tapping as well, I sometimes have to tap multiple times for it to register correctly. I tried all the suggestions, cleaning the contacts and restoring my phone and reseating connectors to no avail. I was playing with it earlier and while I had the screen pulled away from the back of the phone it was working correctly for a bit but once I had placed it back into the phone, it reverted back to the way it was acting before. I don't see any damage in the cable ribbons or the connectors themself. I know its not the phone because like I said before the cheaper screens work perfectly for their touch parts. Any ideas?

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Hi Tyler. Normally, a defective replacement screen assembly would be the normal diagnostic. However, having gone through four different ones, it gets harder to say it with the same conviction. Do you have access to another iPhone 5S or SE where you could try to isolate some parts. You really need to know if these screens work or perhaps use a known-good screen in your DUT.

You may also have an issue with the way the screen assembly is seating in the housing. You said it worked ok when the screen was not in the housing. Try removing the logic board and connecting just a battery (known-good, from your stock), Lightning Connector (again, known-good, from your stock) and your screen assemblies for test.

Try to eliminate as many variables as possible. You may ultimately have a logic board issue of the screen cracked due to a heavy impact.

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Thanks for the reply! Unfortunately I don't have any spare phones or parts to test the way you mentioned. I also want to add that I forgot to mention the two screens I've got from ifixit were the complete front displays, I bought just the digitizer and LCD screen as my initial replacement and it worked perfect but I ended up putting a screw in the wrong place and trashed it. It's seeming to be a defective screen as much as I really didn't want to admit it and have to buy another screen, but I do believe since the other screens I've tried had their touch functions working as normal that it's not a problem with the phone itself, not to rule out your theory or anything. Sorry for any errors in my response I'm typing from a half working phone!


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