Hello there !
So i have this issue,
After replacing the motherboard on an iphone X, the taptic engine does not work. Before swapping the boards it was working for sure (tested by me). I replaced the charging flex and the taptic engine itself but nothing changed. Did anyone had a similar case ?
Thank you in advance
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I don't have a specific answer for you, Alkis, but I have some thoughts on it and perhaps one of them will help.
First of all, given that the Taptic engine worked with the old board (plus your having swapped out all of the relevant hardware anyway), we can be pretty sure that the problem is with the new motherboard. Not suggesting you need to, but it would be interesting if we knew that swapping the old motherboard back brought the Taptic engine back to life.
We have two possibilities to investigate; hardware and software.
With regard to hardware, I do not know enough about the iPhone electronics to know how the Taptic engine is activated and what signals are used, so the only suggestion I have here is that there could be an issue with the connector on the motherboard, since we're assuming the cable connector is good, given it worked on the old motherboard. Get out a good light and a magnifying glass and look closely at the connector itself. You're looking for bent pins, dust or debris blocking contact, any discoloration, etc.; basically anything out of the ordinary.
As far as software, swapping out the motherboard means an entirely new set of software, including phone settings, OS version, apps installed, etc. I don't know what you've done so far, but I'd personally start by wiping the phone and restoring everything back to factory settings. That should clear out any kind of software issue that could currently be keeping the Taptic engine from working.
That's all I've got for now; if I think of anything else I'll update this post. Let us know how it goes with your troubleshooting; if you find an answer it could easily benefit someone else who encounters the same problem.
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The Taptic engine is serialised with the logic board. When this happens it is usually fixed by transferring the data from the original Taptic to the replacement with something like the iCopy programmer.
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@imicrosoldering, this is new information to me; I personally haven't run into any problems with swapping out Taptic engines on iPhone X's so far. Can you tell us how you know this, what your source of information is? Thanks!
@dadibrokeit I know this because I do this sort of work for a living. This doesn’t occur all the time and I am not sure why. There are two manufactures of the iPhone X Intel and QUALCOMM maybe that has something to do with it. But the first rule for repairers is “you don’t have a board problem until you have ruled out a software or parts problem”. The OP didn’t say if he tried to reset or update the phone so it could be as simple as that. I have never encountered an iPhone X with taptic issues that have been caused by a board problem.
@imicrosoldering, That's interesting. The phones themselves are all manufactured by Foxconn; the Intel/Qualcomm difference is just in which cellular modem is used. IIRC, the Intel cellular modem only handles GSM, while the Qualcomm chip does both CDMA and GSM.
Anyway, I will defer to your experience with regard to the motherboard being the source of a Taptic issue. I was actually trying to suggest that it might be a connector issue on the motherboard connector as something to check.
But yeah, Alkis should definitely verify whether the new board has been reset/updated or not before going any further.
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