Help Transformer Prime dock doesn't charge

[Madpear]

Hi everyone.
I have a problem with my Asus Transformer Prime keyboard dock. It doesn't charge anymore. I can charge the tablet through the keyboard but the keyboard itself doesn't charge. When I plug the cable I briefly have the lightning bolt appearing above the keyboard battery indicator but it switches back to the orange exclamation mark after less then 1 second.
The orange led next to the cable flashes when the cable is plugged.
Any idea?

 

[doniago]

I don't have ideas unfortunately, but I'll note that you posted in the "generic" Transformer forum, not the TF Prime folder. I'm not sure whether that might influence the amount of help you'd receive. I'll ask a mod to move this to the proper area. Good luck!

 

[Madpear]

Thanks for having put my thread in the correct forum.
And thanks for your reply, I hope I'll find a solution indeed.

Edit: info update
I tried a colleague's cable on my tablet and same result, the bolt icon appears for one second over the dock battery then disappear. I also tried another dock on my tablet and it works fine. So the problem definitively comes from my dock.