878B Secondary Power IC For Qualcomm

Original Service Part (ORG) manufactured by Qualcomm.

• Model Number: PMI8953 (Commonly marked 878B).

• Type: Secondary Power Management Unit (Sub-PMIC).

• Function: Assists the main PMIC by regulating voltage for secondary rails (often fuel gauge, audio, or display power) and managing the charging interface.

Common Fixes:

1. Dead Power: Short circuit in the secondary power rail prevents the device from booting.

2. No Charging: Failure to initiate charging sequence or fake charging.

3. Power Leakage: High current draw when the device is idle.

Compatibility: Widely used in Snapdragon devices (2016-2018 era):

• Xiaomi Redmi: Redmi Note 4X, Redmi Note 5.

• Samsung: Galaxy S7 / S8 / Note 8 (Snapdragon versions – G9300 / N9500).

• Huawei: P9 Lite (Qualcomm variants).

• General: Devices utilizing the Snapdragon 625/630/660/820 chipsets.