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Laptop power jack overheating issues

Started by Bryan Williams50 · · 👁 3 views · 4 replies

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Participants Bryan Williams50Jerry Robinson56
Bryan Williams50 Bryan Williams50 MemberOP
16 messages
joined Mar 2024
#1 ·
My laptop charger has started acting up. It keeps cutting out intermittently; I have to wiggle the cord just to get the charging to kick back in. I haven't quite figured out if the issue is the port on the laptop itself or the charger, though my gut tells me it's likely the connection on the machine side.
What’s actually worrying me more is the heat. When I unplug the connector from the laptop, the tip is so scorching hot that I can barely touch it with my fingers. I can't quite remember if it used to get this bad...
Once the battery hits full charge and stays plugged in, the connector eventually cools down.
It’s a 120W power adapter.
I'm not sure if the intermittent connection and the overheating are linked, or if a connector getting that hot is even remotely normal.
Jerry Robinson56 Jerry Robinson56 Regular
320 messages
joined Apr 2013
#2 ·
Everything is behaving exactly as expected 😁. Current generates heat based on resistance—in this instance, likely due to a poor connection. As the temperature rises, the material's specific resistance increases, which only exacerbates the issue. It will continue to heat up as long as it's drawing power.
It is technically possible that there is a cold solder joint on the connector inside the laptop, though I suspect the fault lies within the charger port itself. You can verify this using a voltmeter, or alternatively, grab a 24V bulb and some jumper wires; connect them to the charger and wiggle the cable. If the light flickers, you have confirmed the charger port is the culprit.
I would suggest leaving the disassembly of the laptop to someone who actually possesses the proper tools.
The most efficient solution is to borrow a similar charger. It will likely be 19 Volts with sufficient amperage—roughly 6A, though a weaker one will suffice for a quick test. Once connected, after just a minute or two,
you will be able to determine if the overheating persists and identify the true source of the problem.
Bryan Williams50 Bryan Williams50 MemberOP
16 messages
joined Mar 2024
#3 ·
First off, thanks for getting back to me!
Second, it looks like you hit the nail on the head—it’s definitely the charger. I grabbed my multimeter to double-check, and the voltage is all over the place; as soon as I nudge the leads, the reading jumps or drops.
The charger is pretty new, so I'm a little baffled that it gave out this quickly.
Jerry Robinson56 Jerry Robinson56 Regular
320 messages
joined Apr 2013
#4 ·
Bryan Williams50 said:First off, thanks for getting back to me!
Second, it looks like you hit the nail on the head—it’s definitely the charger. I grabbed my multimeter to double-check, and the voltage is all over the place; as soon as I nudge the leads, the reading jumps or drops.
The charger is pretty new, so I'm a little baffled that it gave out this quickly.

Bravo.
It’s actually a relief to have some clarity.
The culprit is likely just a weak point in the connector or the cable itself. Given the heat buildup, you might be dealing with a loose connection, a faulty solder joint, or perhaps a manufacturing defect in the wiring. It's possible the connector doesn't meet the required spec, though that seems less probable. That erratic jumping in the reading isn't coming from the charger itself; the voltage drops instantly, but a voltmeter needs a moment to register that drop down to zero.

You could head down to a local hardware store like Home Depot 😁 to find a replacement connector. Just be extremely careful with the polarity—positive and negative matter immensely here... though most cables use the braided shielding as the ground, so you should be able to identify where to solder everything.
Bryan Williams50 Bryan Williams50 MemberOP
16 messages
joined Mar 2024
#5 ·
Yeah, it’s a lot less of a headache when you're just dealing with a charger connector...
I'll get it sorted; it isn't exactly a massive ordeal, and honestly, I've been through this before.

Thanks again for the hand.

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