The CX2620 style laptops are very similar to the 6000 and 3000 series. It's basically a cross between those two models with a tablet function. They use the same four pin, 2.5mm dc jack.
When this CX2620 came in I was a little skeptical of a dc jack problem. It worked on battery but I wasn't able to wiggle the jack area to make it charge. Sometimes the customer has already wiggled it so much that it can't make contact anymore.
When the laptop was all torn down the back voltage pin was slightly burnt which is a big symptom I see in a power jack problem.
The jack was replaced with a brand new one and the laptop powered on and charged the battery fine again.
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