Touch not working after repair (PSA)
I use very high quality aftermarket parts from a supplier who backs them with a lifetime warranty. The 3d functions almost identical and the color and brightness are almost spot on to OEM. The main reason I use these is because most customers care about cost and nothing more. Atleast, that is my experience ( I fix around 40 phones a month for extra income). Overall, I have very little issues with their screens. I said all that to say this/ask a question.
Today, I attempted to repair an iPhone 8 plus. I have fixed two recently with no problems. After testing the screen before snapping it in, all was well. After installing it all the way the touch functioned fine, but after I locked and unlocked the phone, the touch died. I tried reseating cables, pulling the screen out to sit on cardboard incase of grounding out etc. Nothing worked. I tried another 8 plus screen from a different supplier. This time the touch never worked. I started to panic, because I believed I had blown a fuse or cap that controls the touch. I tested the broken original screen and it worked fine. I tried two more screens with similar results to the first attempt. It worked fine, but after locking and unlocking the phone the touch wouldn't work.
I gave up, since I was out of screens and gave the phone back broken, but working.
Now here's what worries me. I noticed the phone was updated to iOS 11.3 yesterday. I just successfully repaired an iPhone 8 plus yesterday from the same batch of screens. I confirmed with the customer that she had not updated to iOS 11.3. What are the chances that I had 4 bad screens exhibit the same behavior from two suppliers? Im hoping this isn't a glitch in iOS 11.3 and if it is, will it affect screens across all models? Yes, I know it's best to choose original repair parts or at least original refurbished parts, but customers don't want to pay 50 to 60 bucks more on average for a repair even after I explain the differences.