Glossary › Laptop Repair › DC Jack
What is a DC Jack?
The DC jack is the socket on a laptop that the charger plugs into. It carries power from the charger to the motherboard and battery. On newer laptops a USB-C port does the same job.
Why it fails
The jack is plugged and unplugged thousands of times, and it takes the strain every time the cable is tugged or the laptop is used on a lap with the plug sticking out. The solder joints crack, the centre pin bends or the plastic body splits. On many laptops the jack sits on a short cable inside the case, and that cable can work loose too.
Signs of a failing charging port
The laptop charges only when the plug is held at a certain angle. The charging light flickers when the cable moves. The plug feels loose or wobbles in the socket. The area around the port gets hot, or you see a spark when plugging in.
Why it should be fixed early
A loose connection arcs, and arcing makes heat. Left alone, it burns the contacts and can damage the charging circuit on the motherboard. A port repair done early is a small job. A burnt board needs chip-level repair.
How it is repaired
If the jack is on its own cable, the part is replaced. If it is soldered to the motherboard, the old jack is removed and a new one soldered in. Either way the charger is tested as well, because a damaged plug will ruin a new jack.
Related terms
USB-C Power DeliveryBattery Cycle CountChip-Level Repair