343S0675 Power Management IC for iPad Air 2 (U8100)

The iPad Air 2 is still a popular second-hand tablet, and a no-power fault on one often leads to the PMIC at U8100. It's an underfilled chip that's difficult to remove, so experienced technicians replace it only after ruling out the simpler charging and power circuits around it.

This listing sells the Apple 343S0675 power management IC for the iPad Air 2nd gen (A1566, A1567). On the Air 2 board it sits at U8100, and the listing gives its pin count as 342.

When U8100 is the likely fault

• No power with the battery, Lightning port and charging circuit checked.

• PMIC rails missing with VCC_MAIN present.

• The PMIC heating up with a short that traces to the chip itself.

• Liquid damage under the chip.

Rule these out first

Test the battery, the Lightning flex, the Tristar charging chip and the components in the charging path. A short on VCC_MAIN often comes from a capacitor rather than the PMIC, so trace it with a power supply and thermal camera.

If U8100 really has failed, preheat the board, remove the underfill patiently and clean the pads before fitting the new chip. Then test boot, touch and charging before sealing the screen.