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Mainboard or power supply failure?
davedwin
Posts: 1Member
I was cleaning my hot end with a brass wire brush (while on, and heated). The screen went blank during this, and now when I turn it on I get a single beep. I've tried; restart, reload firmware (via SD), connecting to PC, connecting to OctoPi, complete disassembly/reassembly, and turning on with nothing plugged into the board. I'm wondering if it could be the power supply because the fan on the power supply is not turning on, but if that was the case, wouldn't the main board not beep?
Comments
The power supply has short circuit protection, so should not have failed - maybe the fan only operates when there is a load on the output, and you've killed what was the load
You could put a load on the disconnected power suppy and see if it still outputs 24v - a mains voltage 60 watt old style filament light bulb is the usual test for power supply outputs
I agree that it's strange that you get a beep, but maybe that beep is hardware controlled and not software controlled. It's hard to know if your LCD is damaged or not too.
https://jgmakerforum.com/discussion/1052/always-disconnect-power-before-working-on-your-printer#latest
If the hotend fan turns on when you turn on the power and nothing else works, most likely the mainboard is broken. I'm putting in a PTC fuse to protect the thermistor input/ground circuit to prevent something like this.
The USB will not have enough power to operate the motors or heaters, but otherwise the LCD should be functional - if not then I'd say the controller board is dead
Edit: corrected typo - printer should not be powered on - you want to see if USB power enables operation of LCD without the printer PSU
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