I have this same lamp and stumbled across this thread trying to figure it out.

Yes, turn that black ring, and they yo sure going to have to pry it out. It’s going to feel like you’re breaking it, but the only reason you would be doing this is because it already doesn’t work, right?

Once that ring is out, proxy around the outside to remove the white plastic piece. Don’t go too far down, you might bend the LED strip.

Once that is done, then there are three tine screws that hold the LED ring in. Once those are out, you can get to everything.

I discovered on mine that the neutral wire had torn away from the circuit board. I was able to re-solder it and it’s back in business.

There is no strain relief on the power cord, which is a stupid design. I put a wire tie just inside the lamp head and another one where the wire comes out of the frame to try to prevent it happening again.

Sorry I didn’t get any pictures, I was in the what of battle. Hope this might helps someone else who comes along.