Unlimited heat up on startup

[jbeschokking]

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]

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]

I have replaced the board, thx

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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. — Reply to this email directly, view it on GitHub <#782 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQ5Y3QADF5R5KGK3D3EFBLTZZ3Y55AVCNFSM6AAAAABNZEII5SVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDGOJUGQ4TOOBQGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>