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

Stop before further damage

Shut down the laptop, stop charging and disconnect the charger from its power source if safe to do so. Do not touch a hot or damaged plug, repeatedly reconnect it, or apply load to reproduce the heat. A burnt plug can damage a replacement socket.

Identify the input design

This guide concerns a laptop powered through a round DC jack. The adapter label and the laptop model determine the required voltage, polarity and rating; a plug that fits is insufficient evidence of compatibility. One possible explanation is that high resistance has generated enough heat to oxidise or deform the connection.

Workshop checks

1. A technician should begin with the charger disconnected and the battery isolated using the model-specific service procedure. Inspect the plug, jack and surrounding input path for melted insulation, carbonisation, shorts and loose joints.
2. Confirm the adapter voltage, polarity, rating and connector specification from the model documentation. Identify every damaged mating part before deciding whether the jack, cable or a larger assembly requires replacement.

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, charging under load, connector temperature, battery transition and repeated plug cycles. Stop the test if abnormal heating returns.

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