Duet3: Pi wont power On, 5 & 3.3v LEDs off

Armontrout

Here is one with flash off

Armontrout

Here is one with flash on

Armontrout

@dc42 were you able to look at the photos? Am i able to process a warranty claim?

A Former User

@Armontrout while you wait see if you can do a picture of just this area where L1 looks a bit toasty, with better ambient lighting and no glare?

Armontrout

@bearer @dc42
Good eye, I didnt notice that the first time. And I searched for a while before started a forum post on here.
I had been focusing on fuses though and completely glossed over the IC chip looking bits.
It is a PIA to take a photo of but I put the utmost effort in trying to get a clean shot. I even leveraged my magnifying glass to get a better image lol

A Former User

Not sure that is L4 or L1, but dc42 will probaly figure it out. Did you put the piece of tape over by the bed mosfet or was it there?

Armontrout

@bearer the tape came with the board. I thought that was odd too.

dc42

Yes, L4 looks as if it may have been burned, maybe even shifted. I suspect that the 5V rail has been overloaded. However, we'll replace your Duet under warranty, because the response to overload on the V1.0 boards isn't as good as we planned.

Which Pi do you have, and what else is plugged into the Pi and powered from it? A Pi 4 plus HDMI display might draw sufficient current to overload the 5V output. In which case, use a separate 5V PSU to power the Pi.

A Former User

Not that it would matter to OP as you're replacing the board anyways, but could the board be reworked by the assembly house? Kapton tape, hand written tag, residue might be flux and not signs of overload?

Armontrout

@dc42 I have a raspberry pi 3 B+ with a Ethernet (rj45), wired usb mouse, Logitech c920 webcam, and hdmi.
I’ll make sure to limit what I plug into the pi from now on. Never considered the overload factor.

dc42

@bearer said in Duet3: Pi wont power On, 5 & 3.3v LEDs off:

Not that it would matter to OP as you're replacing the board anyways, but could the board be reworked by the assembly house? Kapton tape, hand written tag, residue might be flux and not signs of overload?

It's possible, but L4 is an unlikely component to need to be reworked.