Malfunction Phenomenon
The Apple logo appeared on the screen when we pressed the power button, then it disappeared after a few seconds and then restarted.
Troubleshooting
For the iPhone X Boot loop issue. First. we take out the motherboard and checked if there was any obvious malfunction area.
Then detach the two layers of the motherboard and then test with fixture iSocket, turned on the motherboard with the DC power supply, the current reading on the ammeter was abnormal. According to the current value and our repair experience, the fault was related to USB IC U6300. Try to replace U6300 with a new one.
After replacing the new USB IC, the current reading on the ammeter gets to normal, and test with fixture iSocket. The phone can be turned on normally.
Resolder the two layers of motherboard together and tested again, all functions are normal, the problem is resolved
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