Burned out diode C91 on the Duet Ethernet board

[zapta]

@patrick_487 , you are not running the board on a voltage higher than 24V, right?

[Patrick_487]

@zapta No, I use 24V on the board

[mrehorstdmd]

@patrick_487 Did polarity get reversed somehow?

[Patrick_487]

@mrehorstdmd No, nothing has been changed on the wiring. It was only switched off for 1 ½ weeks

[T3P3Tony]

@alankilian said in Burned out diode C91 on the Duet Ethernet board:

I would disconnect your main power supply, power it on and measure its voltage.
Also, I would check Fuse F4 to see if it has been blown up also.
If you get a proper voltage on your power supply, and F4 is not blown, I would clean up C91 (Try to pick the remains off the board, but be CAREFUL not to damage the board) and then turn on the power and see which of the power LEDs light up.

these are good things to try

[Patrick_487]

@t3p3tony I have now carried out the recommendation like this.

Main power supply voltage = 24.0V
Fuse F4 is OK, remnants removed from the capacitor.

Attached is a picture with the LEDs that light up when I switch on the printer.

I also created a diagnosis file via the web control.console.txt

[alankilian]

@patrick_487

It doesn't seem like anything was damaged.

Are all motions and the extruder heater working if you don't run the bed heater?

Do you think you can replace the capacitor if you get a new one?

[dc42]

The capacitor isn't vital, its purpose is to avoid the VIN wiring radiating EMI generated by bed heater PWM switching. The board can be used without it.

[Patrick_487]

@dc42 Hi, am I restricted in any way if the capacitor is missing? And do I have to fear further mistakes or even a fire from the board?

[dc42]

@patrick_487 you can use the board as normal, it it's just that capacitor that failed.