I have black verticle lines in display that works on another phone just fine. Another display ..known working on another phone ... will not work at all on this phone but works fine on another phone. I have changed these out several times and stil have the same problem with both LCDs. One lights always with lines and the other never shows anything. Any help.
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I have seen this before at my repair shop on an iPhone 5 that was water damaged. I had to go through a few screens (some cracked glass and others OEM, others new) to find one that would kick back on like his was. Most of the new screens and OEM screens wouldn't even work. But found one that was original part and had small crack and it worked just had the lines like you say. I know his phone was water damaged but I'm not sure I could explain why one screen worked and another didn't. Especially when the one that wouldn't work on his phone would work fine on another.
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try cleaning the connector on your board and inspect it for any damaged pins/missing solder. It sounds very much like there is a problem on your connector
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