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Power IC: Mobile Phone Spares
The power IC — power management integrated circuit or PMIC — is a dedicated chip on the smartphone motherboard responsible for regulating voltages, managing charging and discharging of the battery, and distributing correct power levels to every subsystem on the board. A failed power IC is one of the more common board-level faults in Nairobi, particularly following water damage or use with non-standard chargers.
What the PMIC Does
The PMIC converts the battery's variable voltage (which drops from around 4.2V fully charged to 3.2V near empty) into the stable, regulated voltages needed by the processor, memory, display, RF circuits, and other components — each requiring different voltage levels. It also handles USB charging negotiation, communicates with the battery management circuit, and implements thermal protection.
Failure Causes and Symptoms
Power IC failure is frequently triggered by overvoltage — a faulty charger sending excess voltage, a lightning strike through a connected charger, or reverse polarity from a battery connected incorrectly. Symptoms include the phone not charging, the phone charging but dying instantly when unplugged, failure to power on, or excessive heat from the charging area of the board.
Repair Approach in Nairobi
Power IC replacement is a BGA micro-soldering procedure. The failed chip must be removed using hot air, the pads cleaned and re-tinned, and a donor chip reflowed into position. Board-level repair shops on Luthuli Avenue perform this work regularly — it is one of the most common chip-level repairs in the Kenyan market. Parts cost KES 300 to KES 1,200 depending on the phone model. Labour: KES 1,500 to KES 4,000.
