343S00052 Power Management IC (Big) for iPad Pro 12.9 1st Gen (2015)

The first 12.9-inch iPad Pro uses its own main power management chip, larger than the one in the 9.7-inch model. A failure here commonly shows up as an iPad that won't boot, though display and touch faults can also trace back to it.

This is the 343S00052 power management IC for the iPad Pro 12.9-inch 1st gen (A1584, A1652) from 2015. The listing gives its pin count as 460.

Reasons to replace it

• No boot with a charged battery and no main line short.

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

• A PMIC rail shorted at the chip.

• Liquid corrosion under the PMIC.

Preparation

Confirm the fault with rail measurements first. The 12.9-inch board is large and spreads heat, so a bottom preheater and a controlled profile are essential, along with careful underfill removal around 460 balls.

Afterward, check the rails, then test boot, display, touch and charging before closing the iPad. Getting all four working means the main PMIC is doing its job again.