EXPERIMENT 011

PHONE HARDWARE

Electronics / Repair

COMPLETED

OVERVIEW

Teardown and logic board diagnosis of a dead smartphone. Tracing the power delivery sequence from the battery connector to the PMIC.

Identified a shorted capacitor near the main PMIC. Injected 1V to find the thermal hot spot. Replacing the 0402 cap restored normal boot sequences.

MultimeterThermal CameraMicro-SolderingSchematics

[ LOGIC BOARD MACRO SHOT ]

[ SERIAL LOG ]

[16:20:00.000]> Connecting DC Power Supply...

[16:20:05.000]> Voltage set: 4.2V, Max Current: 2A

[16:20:10.500]> V_BATT connected. Current draw: 0.8A

[16:20:10.550]> WARNING: Unusually high standby current

[16:25:00.000]> Thermal sweep: 45°C detected at C402

[16:40:00.000]> Component replaced. Standby: 0.002A (OK)

[16:40:00.012]>