iPhone 16 Pro Max Dead Baseband after Charging Failure

A dead Baseband CPU usually means an iPhone is unrepairable—until now. In this video, we work on an iPhone 16 Pro Max with no modem firmware and a dead BB CPU resulting from a charging circuit failure. Every repair tech knows this as a "No Fix" scenario, but today, we're trying a crazy workaround that actually brings the cellular signal back to life! The Backstory & Repair Summary: This iPhone 16 Pro Max originally came in with charging issues (bad ACE / USB PD controller). After fixing the charging circuit, the phone still had no modem firmware. After ruling out a board interposer connection issue, I moved to the Baseband PMU power supply stage. By injecting 1.2V into the GPIO_SEQ_PMU_TO_BBPMU_RESET_L line, I noticed a 230mA draw (normal is 30-40mA). Thermal imaging pointed to a short on the PP_3V1_LDO10 line, leading straight into the paired Baseband CPU. Since the BB CPU is paired to the Main CPU, replacing it isn't an option. So, I tried something experimental: removing the BB PMU, masking the shorted pad with UV solder mask on both the board and the chip, and reballing it with a missing ball. The result? The phone activates, reads the SIM, and makes calls perfectly! While I might not be the first technician to ever encounter this, this video serves as the first fully documented repair and step-by-step instruction available online for bypassing this fatal short. 👇 NEED A REPAIR? SEND IT IN! 👇 We specialize in data recovery and board-level micro-soldering. If you have a dead device, we can help. Start your mail-in repair here: https://www.aacservices.ro Or email us at: service@aacservices.ro 🛠️ TOOLS & GEAR I USE: (Using these affiliate links helps support the channel at no extra cost to you!) Microscope: https://eleshop.eu/inspection/microsc... Soldering Station: https://eleshop.eu/fnirsi-dws-200-f-s... Hot Air Station: https://eleshop.eu/atten-st-862d-hot-... iPhone Interposer Reballing Stencil: AMAOE Bench Power Supply: Owon P4305 ( https://eleshop.eu/owon-p4305-program... ), Keysight E36103A, Agilent E3632A Bench Multimeter: Siglent SDM3045X ( https://eleshop.eu/siglent-sdm3045x.h... ), Agilent 34401A, Owon XDM 1041 ( https://eleshop.eu/owon-xdm1041-multi... ) Oscilloscope: Rigol DHO804 ( https://eleshop.eu/rigol-dho804-oscil... ) Front camera: ObsBot Tiny SE Top camera: Canon EOS M100 Audio Interface: Vocaster Two #Microsoldering #RightToRepair #iPhone16ProMax #BoardRepair #TechRepair #AppleRepair