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Assembly Checks
- Verify no connector pins look soldered together
- Verify no pins on STM32 look shorted
- Verify pin 1 on chips aligns with indicator
- Apply a few plug/unplug cycles on connectors to test solder joint quality
Power Testing
DMM
- Make sure no power rails are shorted to ground or each other with DMM
- Slowly increase voltage (with low current limit, 100mA max) on buck input, check its not drawing excessive current/power (ensure no output load)
- Probe the output net for voltage stability with DMM
- Slowly increase voltage on internal 5V rail and verify the internal 3.3V rail turns on (LDO functionality)
E-load
- Perform a load test on buck converter: use an e-load to fully saturate the buck and verify you get the output current expected (up to 1A)
- Step the load and perform efficiency calculations: 12V, 24V, 50V