A failing DC power jack is the most misdiagnosed laptop problem — people replace batteries and chargers first, then find out it was the $30 jack all along. Here are the signs.
1. You have to hold the plug "just right"
If charging only works when the cable sits at a certain angle, the jack's internal pins are worn or the solder joints are cracked. It will not heal — it gets worse until the laptop stops charging entirely.
2. The charge light flickers when you move the laptop
Intermittent contact inside the jack. This one is dangerous: the constant connect/disconnect cycles stress the battery and the charging circuit on the motherboard.
3. The plug feels loose or wobbly
Compare with a new machine — a healthy jack grips the plug firmly. A wobbly jack means the housing or the solder anchors have let go.
4. It charges only when off, or heat around the port
Heat near the DC port is a failing joint creating resistance. Stop using it — heat damage can spread from a cheap jack repair into an expensive motherboard repair.
What the fix actually involves
On most laptops the jack is either a cable-harness type (unplug, replace, done — a great DIY job) or soldered to the motherboard (needs proper desoldering equipment — that's a shop job). We stock DC jacks for HP, Dell, Lenovo, Asus, Acer and Toshiba, matched by model, and if yours is the soldered kind our bench does it the same day — with the charging circuit tested afterwards, because a worn jack sometimes takes the circuit with it (that's board-level territory, and yes, we do that too).