PanelDue black after crash

Veti

the melting prob made the 5v and gnd touch.
this will short the 5v regulator.
that is why the paneldue does not light up.

disconnect all and see if you can get the board to come up with only usb connected to see if more is damaged

dc42

As @Veti says, disconnect everything and see what LEDs light up on the main board. If it's just the blue one, check the 7.5A fuse. Also check IC U3 for signs of damage.

You can check the PanelDue by disconnecting it from the Duet and providing it with power through its USB connector.

Hornetrider

thanks for the fast feedback.

Is there a way to protect against such failures? It hasn't been the first time for me that the BLTouch was close to the Hot-End...

Another question.
In the "how to destroy" guidelines it is stated that +12/24V connected to the 3.3/5V is the way to do harm. How can GND (housing Hot-End) cause the same?
Are 3.3/5V pins on the connector block not protected against shortage?

I will check if my Hot-End (E3D) and GND are connected....

Anyway, I will report my findings

Hornetrider

Hey guys

checked everything.

Fuses ok
External supply via USB and the thing works again
no contact of V6 HotEnd towards GND or Plus

So, why does a short between the 3 wires of BLTouch grill the 5V Supply?

Cheers

dc42

Normally, it shouldn't. Is there any sign of damage to U3?

Hornetrider

Where do I find U3?

dc42

It's the small square chip close to the 5V_EN jumper.

Hornetrider

@dc42 OK. And bad signs would be?

dc42

@hornetrider said in PanelDue black after crash:

@dc42 OK. And bad signs would be?

A burn mark or crater on the chip.

Hornetrider

@dc42 U3 is gone. There is a crater. I have contacted my dealer to find a solution