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Remove the SIM Card holder
Remove screws with a screwdriver
Disconnect the battery connector
The supply is 4.2v but the meteramps are very low, which is not normal
Remove the cameras
Heat the PM IC with Hot Air Gun al 400-c and Airflow 60
Clean with PCB cleaner
Reball the PMIC
Assemble the motherboard
Xiaomi POCO M3 no power/nol turning ON successfully repair