343S00326 Power Management IC (Big) for iPad Pro 12.9 4th Gen (2020)

On Apple's fourth-generation 12.9-inch iPad Pro, most of the rails start at one large Apple PMIC with 342 pins. When that chip fails, the iPad usually stays dark, and sometimes it shows partial life with display or touch faults that point back to power rather than the screen.

This listing sells the Apple 343S00326 power management IC, the big PMIC, for the iPad Pro 12.9-inch 4th gen (A2229, A2069, A2232). The listing gives its pin count as 342.

Typical fault pictures

• A dark screen and no response to the buttons, even on a charger.

• The board pulling unusual current the moment power is applied.

• Touch or picture faults that follow the board, not the screen.

• Heat building at the PMIC with a shorted rail.

Preparing for the swap

Measure the rails of the smaller power chips (343S00327 and 343S00328) too, so you're sure the big PMIC is the problem. Then preheat the large board evenly, remove underfill slowly and clean the pads without lifting any.

After fitting, check every rail before full assembly, then test boot, Face ID, LiDAR, touch and charging. With all of them working, the iPad can be sealed up.