I’ve repaired my filament sensor today. After I’ve finished checking every connections, I turned on my A1. Everything was good and I powered it off. When about 5 minutes later I returned it on the screen, the fans and basically everything except the power switch’s light just won’t turn on
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If you have tried turning off for a few 10s of seconds then turning back on and it does the same then definitely sounds like an issue for Bambu support. Check that the mains cable is fully pushed in, as are any of the connections you touched internally, just in case it is some silly intermittent power thing.
Double check the cables, switch, and if all else fails, contact BL.
Just to give a hope to you all who will ever read this: do not panic, fix might be 3mins away 
My A1 was bricked - I thought. Powered off, on, off 20x. Power button got on, front LED got on, but display black, camera’s LED off, no boot up sound.
I got it upside down, re-connected all the connectors back, powered on - the same.
Was already gathering documentation for my first-ever support ticket…
Then I looked up on SD card. Powered off. Pushed SD card out, powered on.
Tadaammmm! Display alive, camera LED ON, welcome sound. SD card was an issue. When got it to my laptop, card was unreadable also there. Formatted new SD card, all works fine.
Stay calm and print more Good luck!
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Thank you so much, man. I never would have found it. It definitely works.