343S00422 Power Supply IC for iPad Air 4 (2020)

Besides its 182-pin power chip, the iPad Air 4 carries a large 420-pin power supply IC. When this bigger chip fails, the Air 4 usually won't start at all, and display or touch faults on a partly working board can also lead back to it.

This listing sells the Apple 343S00422 power supply IC (also referenced as 998-19946) for the iPad Air 4th gen (A2316, A2324, A2325, A2072). The listing gives its pin count as 420.

When it's worth checking

• No boot with a good battery and charge port.

• Abnormal current at power-on.

• Display or touch faults that remain with a new screen.

• A short traced to the chip.

Before you start

Measure the rails of both power chips to work out which one has failed. The 182-pin 343S00394 is quicker to replace, so it's worth ruling it in or out first.

For the 420-pin part, use a preheater, remove underfill slowly and prepare the pads carefully. Afterward, test boot, touch, Touch ID and charging before sealing the screen.