iPhone 7 Can’t be turned repair Troubleshooting

Machine model: iPhone 7
Malfunction: The mobile phone can’t be turned on.
Maintenance process:
Received an iPhone 7 of no booting from the customermobile phone,DC power supply on the disassembling machine is large current, and large current is generally caused by VCC PP_BATT_VCC of battery or large current PP_VDD_MAIN with VCC or chip damage.

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