I’ve had exactly the same problem on my X20. I followed the disassembly guide and traced the fault to a blown fuse on the main board, a tiny SMD fuse in 0603 package. I believe this is rated at 2.5A. I’m going to replace it and if it works I will add a replacement guide. Hopefully there are no follow-up faults.
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=== Update (05/14/2020) ===
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I’ve replaced the fuse on the PCB and reassembled the camera - it is working absolutely fine now! I've added steps to the disassembly guide to show where the fuse is located.
I’ve had exactly the same problem on my X20. I followed the disassembly guide and traced the fault to a blown fuse on the main board, a tiny SMD fuse in 0603 package. I believe this is rated at 2.5A. I’m going to replace it and if it works I will add a replacement guide. Hopefully there are no follow-up faults.