5 
3 iPhone 7 Plus works only with chinese knockoff displays
Hello, I recently fixed up an iPhone 7 Plus for a customer with a faulty display. I tried several displays but only a cheap knockoff chinese display works with the phone.
I tried using OEM Apple displays from other devices. When i connect up the original display the phone boots normally but the touch doesnt function properly and it has weird lines going through it, but when i connect the Chinese display touch functions correctly but it has lines going through it too.
Any idea on what might be causing the issue?
PS : very weird issue and happened to me for the first time.
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I doubt whether this will be a screen problem as you have tried multiple screens and still have the lines. To diagnose this problem you would have to connect an iBridge to the connector and start taking some measurements, preferably with a scope as it is probably a clock or data line where you would find the issue. It might also be a good idea to check the chestnut lines but it does sound like a CPU issue.
- de Chris Stables
yeah, i know it isnt a screen problem. it should be a board level issue but can anyone guide me in the right way? im new to iphone microsoldering and board repairs. cheers!
- de Myron.