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bigtreetech / BIGTREETECH-SKR-mini-E3

BIGTREETECH SKR-mini-E3 motherboard is a ultra-quiet, low-power, high-quality 3D printing machine control board. It is launched by the 3D printing team of Shenzhen BIGTREE technology co., LTD. This board is specially tailored for Ender 3 printer, perfectly replacing the original Ender3 printer motherboard.
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Unlimited heat up on startup #782

Open jbeschokking opened 1 month ago

jbeschokking commented 1 month ago

I am running an skr mini e3 V2 with a stock ender 3 pro hotend and raspberry pi with klipper and mainsail. The printer was working fine like this. Yesterday I noticed both the bed and hotend immediately starting to heat up on power up. I did not give any commands, just turned the power on. On the mainsail webpage I can see the temperature on both skyrocket. This to me indicates both thermal sensors are working fine. After disconnecting the pi I see the same behaviour. I measure 24V on both the bed and hotend heater pins on startup. Is this normal? Has anyone experienced a similar issue?

EchotreePrints commented 1 week ago

TL;DR: A core component that allows the firmwarw to control the heating is fried, and unless you can source the part and desolder/resolder the component, I would get a new board.

Sounds less like a firmware issue, and more like a busted mosfet for the bed heater. The contacts for the Vin and GND wires to the bed are very exposed and it's somewhat common for something to bridge the connections. This fries the mosfet and causes the gate to be stuck open, sending full power to the bed. The easiest way to fix this is to get a new board.

jbeschokking commented 1 week ago

I have replaced the board, thx

On Fri, Oct 4, 2024, 22:11 EchotreePrints @.***> wrote:

TL;DR: A core component that allows the firmwarw to control the heating is fried, and unless you can source the part and desolder/resolder the component, I would get a new board.

Sounds less like a firmware issue, and more like a busted mosfet for the bed heater. The contacts for the Vin and GND wires to the bed are very exposed and it's somewhat common for something to bridge the connections. This fries the mosfet and causes the gate to be stuck open, sending full power to the bed. The easiest way to fix this is to get a new board.

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