Battery not charging if connector moved

This laptop has a power problem. The battery stops charging when I move the AC adapter connector inside the jack. When the connector or power cord moved, the battery charge LED light on the front goes on and off.
Let’s troubleshoot this problem and figure out if this is DC jack related failure or the AC adapter is defective.

First of all, I tested the laptop with the battery removed. It turns on and runs properly from the AC adapter but as soon as I start moving the connector inside the jack the laptop shuts off and it loses power immediately.
If you have a problem like that, most likely it’s related to the AC power adapter or the DC jack.

First of all, I tested the adapter with a voltmeter. The power didn’t cut off no matter how badly I wiggled the cord. I was reading 15.45VDC all the time. It helped me to make a conlcusion that there is nothing wrong with the adapter connector or cord and most likely there is a problem with with the power socket inside the laptop.
The next step was the DC jack inside the laptop.

In order to access the jack I had to disassemble the laptop and remove the top cover assembly with the display.
You can find disassembly instructions for most laptops in their service manuals.

In my case the DC jack was attached to a cable and I easily disconnected it from the motherboard. I tested it with the voltmeter as it shown on the following picture.
When the adapter cord didn’t move, I was reading 15.45VDC.
But as soon as I started wiggle it, the voltage dropped to 0VDC.

The DC jack harness is defective and had to be replaced and the new one fixed the problem.

In some models the DC jack is soldered to the motherboard.
If the battery stops charging when you move the adapter plug, test the AC adapter first. If it pass test, replace the jack.