Screen wont respond to touch after replacing a screen with same issue

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iPhone XS Max

发布于2018年9月21日，型号为A1921,A2101,A2102,A2104。支持GSM,CDMA / eSIM或 nano-SIM / 拥有64,256或512GB容量可选 / 有银色、金色、深空灰可选。（读作iPhone 10XS Max)

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Tony @falco1

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发帖于: 2020年3月4日

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Screen wont respond to touch after replacing a screen with same issue

I bought a broken iPhone XS Max which has a smashed back and a screen that has a working display but wouldn’t respond to touch. Also, the screen had what looked like a small“dead pixel” from the impact, visible when powered on. It appears that the impact happened to the back since the display is not cracked.

I replaced the screen/digitizer with a brand new one from Ebay but it still doesn’t respond. I was under the impression that all of the logic for touch was in the screen itself. Apparently not.

I’m assuming the issue is with the logic board. Aside from the unlikely possibility that the new display is also defective.

Can an expert advise me on where I should be looking for damage that would cause touch to not respond? Is this something I might be able to fix with a soldering iron?

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I have problem with ,xs Max touch screen top status bar area only, touch problem in that place, more in left corner

由 faisal.raja8614 完成的 2020年7月19日

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I have problem with ,xs Max touch screen top status bar area only, touch problem in that place, more in left corner — faisal.raja8614

Brian Wood @thinksmartpc 声誉积分: 5.4千 Think Smart PC 6 11 · Answer 1 · 2020-03-04T13:18:13-07:00

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Brian Wood @thinksmartpc

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You are on the right track, but remember the logic board has to relay the touch info to the processor and the screen is plugged into the logic board. If the board took a big impact and any traces were broken during the impact, then you may be out of luck. I don’t micro solder so I don’t know if there are any fuses etc that can go out or need to be replaced, but your issue is more than likely a board-level issue. Id find someone reputable to send it to.

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Brian is right. These boards are in two layers and are connected by solder balls. I would suspect some pads or solder balls have sustained damage from the drop. The board layers will have to be separated. If you are lucky it might just need a re-ball if not jumper wires will have to be run. It might be best to keep it for spares.

由 Chris Stables 完成的 2020年3月4日

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iPhone XS Max

Screen wont respond to touch after replacing a screen with same issue

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