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I replace the battery and accidentally break the taptic engine cable. Will that be the cause of Apple logo just turning on and off? Update (09/16/2022) I tried putting back the old battery and still showing the same problem, tried reseating all.the cable i took.before and same.thing happen. I tried repair recovery same thing, haven’t done the full recovery or dfu reset. Update (09/17/2022) Seems there’s a hope in unplugging the front camera and it dhows press home button to recover, but my home button is not responding. Is there a connection between home button and the damaged taptic engine?
It’s pretty doubtful the Taptic Engine would cause this issue, the Taptic Engine is not required to be connected for an iPhone 7 Plus to boot properly. If you’re getting this sort of behavior after a battery replacement, I’d be more likely to think that the new battery is faulty, or some damage around the battery connector may have been done. Could also be the front facing camera assembly. Retrace your steps, see if anything looks out of place. There’s a pretty extensive page on this sort of “boot loop” issue, but iPhone 7s in particular just have a tendency to bootloop. For a lot of reasons. UPDATE: 9/30/2022 I am glad to hear you’re making progress. But in regard to your home button issue. Before you replace, two things to be aware of. Before replacing the home button. Be sure that there is no damage to the outer cable coming from your display. This cable is responsible for home button and is commonly torn during screen removal (because it’s easy to do). If it’s damaged, what you actually need is to replace the display.If you determine the home button cable coming from the screen is intact, be aware that replacing the home button will require making sure to get one which restores home button function. Many replacement parts will say in the description “for cosmetic purposes only” which means it looks pretty, but don’t fix the button’s function.
Hi Nielson, My wife’s iPhone 7 plus went into a boot loop like yours spontaneously, and it turned out the be the front camera. Try unplugging the front camera and power on the phone (disconnect the battery first). If it comes up, buy a new one and replace it. iPhone 7 Plus Front Camera and Sensor Cable - iFixit Store
It should boot fine without the Taptic Engine iirc. I would check for damage around the battery connected as it is common for that to get messed up due to poor handling. Have you tried booting with the old battery?
