Honor 9x water damage can't be opened for repair

Honor 9x water damage can’t be opened for repair

Machine model: Honor 9x
Customer description:water damage can’t be turned on.
Test result: the mobile phone water damage can’t be turned on.
Fault analysis: Because the mobile phone is the fault caused by water damage, it is directly disassembled for maintenance, and the maintenance focus is biased towards water damage water damage, which leads to chip or component Short circuit.
First, remove the motherboard and observe the appearance of the motherboard. At the same time, use DC power supply to power up and check the current situation. After inserting DC power supply, the motherboard short-circuit current 1.6A Open Boardview to see which components are included in the main DC power supply circuit.

Honor 9x water damage can’t be opened for repair Figure 1.

Then check the yellow component, and finally find that there is serious corrode in the lower left corner of the motherboard.

Honor 9x water damage can’t be opened for repair Figure 2.

After cleaning the place of the motherboard corrode, fumigate Colophony (Solder), turn on the power again, and instantly find an Capacitor of Short circuit. After prying the auto power off, the fault recovered.