Pattern to record: Brown plastic, a hot-plastic smell or local discolouration surrounds the socket.

Stop before further damage

Stop using the all-in-one and disconnect its external supply from power if safe to do so. Do not touch a hot connector or repeat a display or processor load to reproduce the symptom. Opening the display or any mains-powered section requires trained handling.

Identify the input design

This guide applies to an all-in-one with an external low-voltage adapter. An all-in-one with a mains lead entering the chassis has a different power arrangement; identify the model before selecting an adapter or opening the display. One possible explanation is that high resistance has generated enough heat to oxidise or deform the connection.

Workshop checks

1. A technician should first inspect the adapter plug, DC socket and nearby wiring with the unit disconnected from power, following the model’s service procedure. Check for heat-damaged insulation, loose joints and shorts.
2. Verify the specified external adapter and socket assembly for this model. Do not substitute a similar-looking plug or treat an all-in-one with an internal mains supply as the same input design.

Repair and power verification

Replace heat-damaged mating parts or assemblies as the model requires and correct the cause of poor contact. A burnt plug must not be reused with a new socket. Powered diagnosis is a professional step only after unpowered checks and any necessary repairs have established that it is safe. Using appropriate test equipment and the correct power supply, a qualified technician can then verify cold start, display brightness, processor load, sleep and repeated restarts. Stop the test if abnormal heating returns.

For an assessment of your all-in-one computer, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.