Duet Wifi went Bang on first startup

elmoret · 6 Sept 2018, 15:31

Which chip? Picture?

My money's on 24v getting fed into the 3.3v rail.

mmoram · 9 Jun 2018, 16:40

No sure, theres not much of it left, Its small square chip close to the fan inputs and the jumpers infront of them.

elmoret · 6 Sept 2018, 16:42

Sounds like U2, which is the Vin -> 3.3v regulator. It goes bang when backfed 24v on the 3.3v rail. Most likely the rest of the board is non-functional now, as all the 3.3v parts have been fed 24v.

mmoram · 6 Sept 2018, 16:45

I cant see the component number for the chip, but its very close to U3, if that helps

fcwilt · 6 Sept 2018, 16:50

Hi,

Sorry to hear you fried your Duet.

It really helps to be a little OCD when wiring up things like the Duet.

I don't double check my connections, I triple check them, sometimes more.

And then I check them all again.

Frederick

mmoram · 9 Jun 2018, 17:59

Thats the frustrating thing I did double/triple check the wiring, this is the problem, i cant see where i went wrong, everything looked correct

elmoret · 6 Sept 2018, 17:57

If you post some photos of your wiring/setup, might be able to spot something.

A possible cause is +24v getting into the heaterblock, and the heaterblock touching the IR sensor (which is on the 3.3v rail).

fcwilt · 6 Sept 2018, 18:15

@mmoram said in Duet Wifi went Bang on first startup:

Thats the frustrating thing I did double/triple check the wiring, this is the problem, i cant see where i went wrong, everything looked correct

As suggested post some photos. It is likely that there is a wiring error OR perhaps a short.

Anything on the underside of the board that could have shorted something?

Frederick

dc42 · 9 Jul 2018, 10:40

I'm sorry to hear that your board has failed. Please post a photo of the damage so that I can identify which chip has failed.

mmoram · 7 Sept 2018, 08:45

@dc42 Yes not a problem, ill send over some photos this afternoon after i finish work, Thankyou

mmoram · 7 Sept 2018, 15:02

@fcwilt Hi There
Here are the photos, hopefully you will be able to see if ive wired it wrong, but i think everything is correct. The board is also on 10mmplastic standoff son that nothing can short out the underneath.

mmoram · 7 Sept 2018, 15:04

@dc42 Hi There
Heres the photo of the blown chip.

dc42 · 9 Jul 2018, 15:07

Thanks. I don't think that failure was caused by your wiring. Please ask for your Duet to be replaced under warranty, referencing this thread. See https://www.duet3d.com/warranty.

mmoram · 7 Sept 2018, 15:16

@dc42 OK, thankyou, i purchased the board through E3D so will i need to contact them instead, or can i go through you on this occassion

T3P3Tony · 7 Sept 2018, 16:28

@mmoram please go through e3d.