iPhone Hardware Isolation

Introduction

Is your iPhone restarting with no apparent cause, stuck in a boot loop, or simply refusing to power on at all? If you've tried all the software solutions to no avail, you've got a problem with some physical part of your phone. But which one? There's no need to guess. Try this method to suss out which component is giving you trouble.

Note: The images in this guide reference an iPhone XR, but can be applied in principle to any iPhone (or cell phone).

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Étape 1 iPhone Hardware Isolation

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Open up your iPhone. Reference the relevant guide for your model for more details.
Disconnect the battery before any other component. If you aren't sure which connector is for the battery, the battery replacement guide for your model will point you in the right direction.

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Étape 2

Once the battery is disconnected, remove the screen for the best access to your iPhone's internals.
Take a picture of what it looks like before any further disassembly. That way you'll have a record what goes where. You'll specifically want to know where any brackets holding connectors in place go.

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Étape 3

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Take a look at the logic board, and make note of any metal brackets (cowlings) holding connectors in place.
Use a Y000 and Philips 000 screwdrivers to remove the screws from any brackets.
Remove the brackets from the connectors using ESD safe tweezers.
A method for screw and cowling organization is highly recommended so you don't lose anything.

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Étape 4

Disconnect all connectors from the logic board, gently bending the flex cables away so they they aren't close enough to make contact.
You can remove components as you like for easier access to others but the more you remove, the more you need to reassemble later. The idea is to limit the number of parts that are in play—not to dismantle the whole phone.

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Once you have disconnected everything, reconnect the bare minimum required to boot up the phone (and know it's booting). In most cases this will mean a display, a battery and either the power button cable or the charge port assembly to trigger boot.
For sustained use, all iPhones beyond the X need certain sensor containing parts connected to prevent a reboot after 3 minutes. Make sure you have a known good battery, charge port assembly and power button cable to prevent this.
Refer to the SMC Panic Assertion failed page for a more complete list per model.
With only the fewest number of necessary parts connected, try to recreate the issue. If your issue has resolved, start reconnecting parts one by one until the issue reappears (be sure to disconnect the battery in between).