2018 XPS 9570 Charger Not Recognized

Dear Community,

On August 20, Dell Service Center replaced the motherboard and DC power unit on my laptop. With the new motherboard, the fingerprint scanner no longer worked, so I sent it back in. On October 7, they replaced the palm rest, motherboard, power switch board, audio board, speakers, AC adapter, and fingerprint authentication cable. The underlying issues and repairs are detailed here.

Since the second repair, the laptop has not been charging properly. I plug in the power adapter, the charging indicator light flashes on, then off and stays off for anywhere from a few seconds to over an hour. Up until this week, the average was a couple minutes, but this week a few times it took much longer. During this period, the battery icon says "Plugged In", but the laptop does not charge. It does not drain either, unless I am running power-intensive applications. If I restart the computer in this state, I get the error on reboot "Alert! AC power adapter wattage and type cannot be determined. The battery may not charge..." If I then run diagnostics, the result will give the same message with a critical error. In BIOS, AC Adapter = Unknown. Note, I have tried multiple Dell OEM adapters that worked with the laptop before the repairs, and this is a new battery purchased from Dell within the last year. 

Once the computer recognizes the adapter, it charges, slowly at first but speeding up over time. If I then restart the computer, I get no warning, and BIOS shows AC Adapter = 130w.

I found other posts here and here, and the issue appears to be either the jack or the motherboard. I opened the back to see if the jack was sliding as others have experienced. That was not the case. It makes a strange high pitched hissing noise when the charger is connected, which I am not sure is normal. I did a battery reset while I had the back open (disconnect battery from motherboard, remove RAM, hold power button 30 seconds) in case that would do something, but it didn't. 

I am in the last 30 days of the 90-day warranty period from the last repair. Is it worth trying to replace the jack myself? Or do I resign myself to another month without the laptop while they cause potentially more problems with another repair?

Thanks for your insights,

Chris

Other system information:

Microsoft Windows 10 Home (x64) 10.019045

BIOS 1.27.0 (up to date)

Intel Core i7-8750H

Here are some relevant pictures/video:

https://youtu.be/raAH0n0r1ms (20231206 1 jack operation adapter not plugged in)

https://youtu.be/JA6aKbuVlcc (20231206 2 what happens when insert charger)

https://youtu.be/OJli4isZSOY (20231206 3 adapter sound)