"Laser" Fried Duet?

marius-h

While fiddeling with the laser setup here:
https://duet3d.dozuki.com/Wiki/Laser_PWM_control

I managed to short the pwm pin on the logic gate circut (this one) to the GND pin. And the Duet instantly just stopped working.

The extension connector still delivers +3.3 and +5. And the E3 pin also gives out high.

Do i need to get a new Duet or are there someone who knows wich components that i probably fried?

A Former User

If you can replace the components then you can probably read the schematic as well, which is readily available

https://github.com/T3P3/Duet/tree/master/Duet2

Otherwise you may have to specify which Duet board you have.

marius-h

I got the duet wifi. Thanks for helping out.

dc42

Are you sure is was the ground pin that you shorted the PWM pin to? It seems unlikely to me that such a short would damage the Duet.

I suggest you check whether the MCU is getting hot, and if it isn't then work through https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond in case the Duet can be recovered without replacing anything. Also check whether the WiFi module is getting hot and whether the SD card is OK.

marius-h

@dc42 said in "Laser" Fried Duet?:

Are you sure is was the ground pin that you shorted the PWM pin to? It seems unlikely to me that such a short would damage the Duet.

I suggest you check whether the MCU is getting hot, and if it isn't then work through https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond in case the Duet can be recovered without replacing anything. Also check whether the WiFi module is getting hot and whether the SD card is OK.

MCU is worm. Esp worm, checking SD-card is good. This is how my lights are.
Also is does not show up when connected to the computer. The ESP does also not do its power up led blink.

alt text

dc42

It's normal for the MCU and ESP to be slightly warm. The blue LED on the ESP won't turn on unless the MCU initialises it.

I suggest you try erasing and reloading the firmware in case the MCU is still OK. See https://duet3d.dozuki.com/Wiki/Installing_and_Updating_Firmware#Section_Fallback_procedure_Num_3.