Teardown Analysis of SwitchBot Plug Mini Failures and the Electrolytic Capacitor Issue

This video examines reported malfunctions in the SwitchBot Plug Mini smart plug by collecting about ten defective units and investigating their internal circuits. The analysis traces the symptoms back to a specific component and compares older and newer production batches.

■ Failure Symptoms and Inspection
- Reported issues such as failure to power on and repeated relay switching
- Serial number batches listed for official replacement
- Visual inspection of opened units and comparison with a working unit

■ Circuit-Level Analysis
- Reverse-engineered power supply circuit and the role of the smoothing capacitor
- Operating waveforms, ripple current, and voltage drops around the Wi-Fi module
- Measured capacitance and ESR of failed capacitors, and causes of deterioration
- Degradation stages and the symptoms each stage produces

■ Batch Comparison and Summary
- Capacitor type differences between 2023 and 2024 production units
- Overview of possible contributing factors and the video's closing remarks

本作は、電子機器の故障解析や回路設計に関心のある方、スマートプラグを長期利用している方に向いています。内部構造の確認から実測データの観察まで一連の流れを追えるため、故障の仕組みや部品劣化への着眼点を学べます。購入前のモデルチェンジ確認や、交換対象シリアル番号の照合にも役立ちます。