OPPO R9s Plus cannot be charged for repair

According to the drawing, the resistance between the two feet in the middle of the battery holder is 570, indicating that there is no short circuit, broken wire/virtual welding, and the measured battery voltage is about 3.7V V.

Machine model: OPPO R9s Plus

Fault symptom: OPPO R9s Plus can’t charge.

Maintenance process:

After getting the mobile phone, test it, plug in the charger, and prompt that the battery is installed abnormally. The ammeter has charging current, and after charging for a few minutes, the current will return to zero. Occasionally, when the battery is turned on, it will prompt that the battery is abnormal and cannot be charged. The failure of reinstalling the battery remains the same.

Disassemble the back shell of the mobile phone, buckle the battery, open Xinzhi software, and measure the resistance between the two feet in the middle of the battery holder with a multimeter according to the drawing, indicating that there is no short circuit, disconnection/virtual welding, and the measured battery voltage is about 3.7V

OPPO R9s Plus can’t charge. Maintenance Figure 1

OPPO R9s Plus can’t charge. Maintenance Figure 2

Use the activation plate to activate the battery, the current is normal, and the cause of the battery is eliminated. According to the related common fault cases, cut off the shielding cover in the upper right corner of CPU with scissors, observe that the motherboard is normal, directly remove the U2901 chip, put the motherboard back into the mobile phone to start the test, and the OPPO R9s Plus turns on and off and charges normally, and the fault is repaired.