iPhone 6s doesn't vibrate
Hi all, I have an iPhone 6s that is driving me crazy/making my life !&&*! It works perfectly in every way except it doesn’t vibrate at all, doesn’t vibrate when plugged in, when set to silent, when ringing or when using 3D touch.
I’ve replaced the taptic engine but still the same result, I’ve checked continuity all the way from the pads on U3800 (under the ARC driver) to the pads at the taptic engine (arc driver to solenoid out +/-) I’ve replaced U3800 (ARC/vibrate driver) and tested the other functions the chip integrates with i.e loudspeaker and 3D touch, I’m not sure if U3800 is responsible for the ‘wake on movement’ feature but that also works ok. I’ve checked for shorts on the various capacitors which are connected. The only thing I’ve not checked is resistor R0921 which seems to be on a CLK line between the CPU and the ARC driver.
I’m ok at replacing parts but I lack the knowledge of how the various IC’s communicate with each other and what is likely or not likely to be a culprit.
Does anyone have any advice before I scrap this phone? It’s so annoying as the vibrate function might seem trivial but to me it’s fairly critical.
Thanks in advance if anyone has any advice.
Is this a good question?