343S00120 Small Power IC for iPad Pro 10.5 (2017)

Apple's 2017 iPad Pro 10.5-inch pairs its big main PMIC with a smaller power IC. If the small one fails, the tablet can still refuse to boot, which is easy to blame on the main PMIC until the rails are measured properly.

This listing sells the 343S00120 small power IC for the iPad Pro 10.5-inch (A1701, A1709). The listing gives its pin count as 121.

When it's the likely cause

• No boot while the main PMIC outputs are present.

• A rail missing that this chip supplies.

• A short on its supply traced to the chip.

• Corrosion around it after liquid.

A quick tip

Measure the main PMIC rails and this chip's rails separately. If the main PMIC is working and this chip's outputs are missing with good inputs, you've found your fault without touching the bigger chip.

Fit with a preheater and fresh flux, check the rails and test boot and charging. A clean boot shows both power chips are now working together, and a full charge cycle confirms it.