No Power - No Screen Boot - Troubleshooting

Bambu Lab X1 Series Bambu Lab X1C
1

Purchased a “for parts” x1c off ebay.

It appeared just the tool head needed repair. The printer powered up and the screen worked as it should.

When I went to put the tool head back together I plugged in the filament run out sensor and must have done it backwards and the printer shut down.

Screen went black. I could smell something but did check the fuse at the power switch and it’s intact.

I am not sure where to troubleshoot first. I have since unplugged the filament sensor and it will still not power on.

Not sure if there are any other fuses I should be checking or if the problem is the main board or some other board.

2

The power supply is probably still good if the fuse is still intact, but you blew a “downstream” regulator someplace.

You’re going to need to take it apart and inspect the PCBAs to try and locate the component you fried, and then replace it.

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3

Not sure what happened but today it started to work.

but now there is a slew of issues. I replaced the extruder th board because who ever had it before broke the connectors. I have checked multiple times I have the cable securely in its socket.

However, even with a new hotend assembly the hotend temp does not read and the hotend runs away and gets smoking hot.

Lastly the part fan does not work. I checked the connections and they are secure. The fan spins freely.

this used printer had 1830 hours on it.