W520 not charging while in docking station

Hi
I've got a W520. When connected to the docking station it shows charging in the power manager, but the battery is unloading at the same time, so it says it's charging the battery but it really doesn't. I tried to clean the contacts but it didn't change. I'm using the 170W AC adapter and if connected directly to the notebook the battery is charging and it works. Any help would be greatly appreciated. Thank you.
/C
PS I have all the newest updates. I did install a BIOS update, and even a battery update some days ago. After that everything was still fine. The problem occured only yesterday. I also restored the bios defaults, no change.

IMO, the sound probably isn't a good sign. Maybe a contact is subpar and zapping?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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Device name: ASMB013
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PCB Lot Code: 0000
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Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 1
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
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rgregoryadams wrote:
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ThorsHammer wrote:
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W520, i7-2820QM, BIOS 1.42, 1920x1080 FHD, 32 GB RAM, 2000M NVIDIA GPU, Samsung 850 Pro 1TB SSD, Crucial M550 mSata 512GB, WD 2TB USB 3.0, eSata Plextor PX-LB950UE BluRay
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W520 not charging while in docking station

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