Power Management IC (Big) for iPad 9 (2021) (343S00519)

The iPad 9 (2021) is a popular choice for schools and families, so many of them see heavy use. Its main power management IC brings up every rail when the tablet starts, and a fault here can stop the iPad from booting or cause display and touch problems.

This listing sells the big power management IC, part number 343S00519 with 400 pins, for the iPad 9 (model numbers A2602, A2603, A2604 and A2605). As the original description notes, a damaged PMU can cause boot failure or abnormal display and touch function, and replacing it may resolve these problems.

When it might need replacing

• No boot with a good battery and charging port.

• A short on a PMU rail.

• Liquid damage near the PMU.

• Display or touch faults with PMU rails out of spec.

Before replacing it

Measure the PMU rails and compare them with a known-good board. Check the battery, the charging port and nearby capacitors first. The chip is large, so use a preheater, remove the underfill carefully and clean the pads well.

After fitting, test boot, charging, display and touch, and let the iPad charge from low to full. A tablet that boots reliably and stays cool around the PMU is ready to go back into service.