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Validation

Bring-Up & Debug

The staged bring-up flow, including the input load-switch issue that turned out to be soldering rather than a design problem.

Built + tested

Bring-Up & Debug

Once the board was built, the first job was figuring out whether a weird behavior was actually my circuit or just an assembly problem before I started redesigning anything.

Darcy BMS assembled hardware
The actual assembled board used during staged bring-up and debug.

Staged Power-Up

I used a current-limited source and brought the board up in layers:

  1. dead-board resistance and polarity checks;
  2. protected battery input;
  3. auxiliary rails;
  4. individual switched outputs;
  5. telemetry/measurement paths;
  6. representative downstream loading.

Input Load-Switch Finding

One early issue appeared on the protected input/load-switch path. The stage did not behave as intended, but the root cause was not the schematic architecture—it was an assembly/soldering problem on the input load-switch hardware.

This was exactly why I was bringing it up one block at a time. I isolated the stage, fixed the soldering, and reran the exact same check before moving on.

Validation Result

After rework, the board proceeded through protected-input and output-switch validation. The controlled outputs were exercised on assembled hardware before integration.

The useful lesson was not 'check your soldering.' It was that a structured bring-up flow kept a simple manufacturing problem from turning into an unnecessary circuit redesign.