Small-Form-Factor PC Power Supply: Overcurrent protection trip | Auckland
Pattern to record: Fans twitch or the PC turns off instantly with one load connected.
Identify the supply and load
Compact desktops may use proprietary PSU shapes and connector wiring. Check the exact system and supply part numbers before substitution, and inspect airflow without opening the mains-powered supply. One possible explanation is that the supply detects excessive current and shuts down to protect itself.
Mains and connector safety
Compact supplies retain hazardous charge and have model-specific pinouts. Repeatedly defeating protection can burn connectors and board traces.
Workshop checks
- Inspect airflow and connector condition and compare rails during a controlled combined load.
- Isolate loads and compare rail resistance before substituting a known supply.
Repair and loaded verification
If the checks support this cause, repair the shorted component or replace the supply if protection is faulty. Verification should cover cold and warm start, processor load, storage activity, USB load and sleep.
For an assessment of your compact desktop, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.