343S00118 Power Management IC (Big) for iPad Pro 10.5 (2017)

The iPad Pro 10.5-inch from 2017 runs most of its rails through one large power management chip. If it fails, the iPad may not boot at all, or it may start with display and touch faults, depending on which rails are affected.

This is the 343S00118 power management IC, the big PMIC, for the iPad Pro 10.5-inch (A1701, A1709). The listing gives its pin count as 400.

Signs pointing to the main PMIC

• No boot with a good battery and no short on the main line.

• Abnormal current draw at power-on.

• Display or touch faults that stay with known-good screen parts.

• A short traced to the PMIC.

Bench approach

Measure the PMIC's input and outputs and rule out shorted capacitors around it. The chip is large, so removal needs a preheater, a slow profile and careful underfill work to protect the pads.

After fitting, check the rails and then test boot, display, touch and charging before closing. A 10.5-inch that passes all four tests can return to everyday use.