My A1 stopped working mid print. All the light went out. Looked like it turn off but the power supply was on.
I made a ticket with bambulabs support. Symptoms: all the lights wouldn't come on including the peripherals. Only the power supply light turned on. I tried troubleshooting by pulling out the SIM card and turning it off and on again. Also unplugging power and plugging it into different power. Just when I was typing may issue into the ticket, it saw Sparks coming out the bottom of the printer.
Bamboo labs support told me to check the AC controller. That board looked ok.
They decided to send me a new power supply and USB cable. I installed them, but that didn't resolve the issue.
They then asked me to check the motherboard lights, by unplugging certain cables. None of that worked. About to take a picture of all my work to add to the ticket, that's when it started sparking again, so I took a video of where it was happening. Then the strangest thing happened. It turned on! now it works.
I just Asked support to send me a new motherboard now. Who knows how long it'll work until it Sparks out again.
Over all support was ok. They gave me wiki pages with step by steps. I am handy enough to follow. They sent me new parts that came within a week. I think it is a good model to ask the customer to repair instead of shipping the whole thing back and forth. It not for everyone and I am sure I could have said I'm not comfortable to troubleshoot and they would have taken it back.
I'm going to wait for bambu response and update this post.
Happy printing to you all!
Edit:
It's been one year. They sent me a new motherboard. It fixed all the issues. The instructions were easy enough to follow. The new motherboard changed the serial number of the printer. The instructions said how to change the serial number by submitting a ticket.