The MacBook Pro 15-inch 2018 (A1990) features a complex power management architecture with Apple’s T2 security chip, ISL9240 battery charger, CD3215 USB-C controller, U2890 PMIC, and voltage-regulating MOSFETs.
Common faults include no charging, no power, T2 bridge failure, overheating near the port, or sudden shutdowns due to faulty power ICs or logic board shorts.
Technicians will inspect board schematics, test input current, identify failing ICs, and replace them with OEM-grade compatible parts under ESD-safe procedures.
Repair may include rebuilding power rails for T2 chip and USB-C communication circuits depending on the extent of damage.
Post-repair diagnostics cover idle current, USB-C power negotiation, temperature stability, and full boot testing to ensure normal operation.