Dead PanelDue 7I

dc42

Yes, try more USB cables. Some micro USB cables carry power only, not data. Also, connect the USB cable to a PC, not a laptop, because some laptops can't provide enough power. [But if you are getting 3.3V then it should be OK.]

If you haven't already, disconnect the 4-pin cable to the Duet while you are using the USB port.

MikeD

Will do.
I have brand new in the box Duet Wifi for the next project, the current cable I am using came out of that box to eliminate the possibility of of a bad cable.

Danal

I am going to hijack this for about two seconds to say what a remarkable person @dc42 is:

He possess a combination of energy, enthusiasm, patience, technical expertise, and just plain helpfulness that is quite rare. The detailed posts about chips and traces on the board, all to help a single person with a product that's already been replaced, that is what brought all of this to mind; this forum is full of other examples.

Thanks from the entire community, Dave!

Back to your regularly scheduled programming...

MikeD

@dc42
Tried other cables, no difference.
Verified cable functionality by plugging up to an old Tom Tom, detected right away, so comms are goood.

U4 is putting out 3.26 V.

CA9 does have 3.26 at the end specified.

Either end of LA2 does show 1.19 V.

Nothing is getting hot.

Replacing the Atsam looks to be within my skilset, provided I can get one and it doesnt need extra programming with tools I may not have.
Digikey shows a few in stock, not sure if they would be exact matches.
https://www.digikey.com/products/en?keywords= ATSAM4S4B-AU

A Former User

@MikeD said in Dead PanelDue 7I:

https://www.digikey.com/products/en?keywords=ATSAM4S4B-AU

those are all the same part, just different packaging. in practice you can only order the cut tape one in small qty. (but i think you want the lqfp footprint?)
(something weird with that search link, this ought be the correct part ?)

Danal

@MikeD said in Dead PanelDue 7I:

it doesnt need extra programming with tools I may not have.

The bootloader on that chip series is in ROM, so it should be BOSSA-able with no pre-programming on your part.

dc42

@MikeD said in Dead PanelDue 7I:

@dc42
Tried other cables, no difference.
Verified cable functionality by plugging up to an old Tom Tom, detected right away, so comms are goood.

U4 is putting out 3.26 V.

CA9 does have 3.26 at the end specified.

Either end of LA2 does show 1.19 V.

Nothing is getting hot.

Replacing the Atsam looks to be within my skilset, provided I can get one and it doesnt need extra programming with tools I may not have.
Digikey shows a few in stock, not sure if they would be exact matches.
https://www.digikey.com/products/en?keywords= ATSAM4S4B-AU

Yes that's the correct part.

A Former User

@dc42 said in Dead PanelDue 7I:

Yes that's the correct part.

did you click the link or just read the url?

maybe its just on my system it shows the -UU bga version?
(no i think digi key is discarding the - and the new part number indicate rev A giving hits for BA-UU instead of B-AU? and he should look for BA-AU)

dc42

You are quite right, I forgot there there is an extra A in the part number. This is the right one: https://www.digikey.com/products/en?keywords=atsam4s4ba-au

A Former User

Nasty "feature" from digi-key though!

MikeD

Just to confirm:
https://www.digikey.com/product-detail/en/microchip-technology/ATSAM4S4BA-AU/ATSAM4S4BA-AU-ND/4557082

Is the one to order ?

Thank you

dc42

@MikeD said in Dead PanelDue 7I:

Just to confirm:
https://www.digikey.com/product-detail/en/microchip-technology/ATSAM4S4BA-AU/ATSAM4S4BA-AU-ND/4557082

Is the one to order ?

Thank you

Yes.

MikeD

Ordered, will see how it goes.

Any recommendations how to go about replacing it ?
I welcome any suggestions.
I will watch some videos etc to better prepare in the meanwhile.

Removal:
I would assume I want to take the PanelDue as far apart as I can, remove the screen etc.
I do have a reflow gun, after taking apart my plan is to try to heat the chip enough to remove by pushing it off to the side? I could see doing this would possibly bridge some gaps.
Or perhaps before heating try to glue something to the top to use as a lifting device ?
I do also have a "solder sucker" and a Hakko FX-888D soldering iron with many small tips.
Should I try individually going around the legs and removing as much solder as possible ?
Also have copper desoldering braid, perhaps that would be the best method before heating with reflow gun ?

Install:
Hmmm, let me remove it first without collateral damage.....

dc42

Unless you have experience with removing this sort of chip using hot air, you might want to look at ChipQuik or similar low melting point solder, and a no-clean flux pen.

To lift the chip off, either use a vacuum pickup device, or glue a piece of wire to the top (which probably isn't workable with hot air but would be with ChipQuik).

Don't be tempted to lever the chip off the board, because that will lift the PCB traces.

Study some of the videos that you will find on YouTube, and practice on an old hard disk drive if you have one.

MikeD

Thank you, great ideas.
Definitely can scrounge up some old electronics around to practice on.

MikeD

I received the new PanelDue I ordered today, came up as it should have.
At least I can be certain that the Wifi board itself does not have anything going on with it that would prevent the PanelDue from doing its job.

MikeD

An update. As I was preparing for brain surgery on this thing it has been sitting in its Anti Static bag for the last at least 48 hours.
Decided to plug it into the computer (same cable, was still plugged into the computer) and that is when i heard that lovely ba-da-bing sound. The computer recognized it and it showed up as a a Bossa port. I was able to flash it.
Currently the printer is mid print, so I cannot install it to verify that it works fully.
Either way, for anyone with a possibly similar situation, letting it sit for a while, and possibly in the anti static bag may be helpful.

A Former User

Thats good news! I think Ian suggested something like that, which interesting to see working!

Now you just need another Duet board to go with the replacement;)

MikeD

The nice thing is that i have another board. Was going to down the line get a duet 5 for it since its a small printer, but it will be a small printer with a big display.

droftarts

@MikeD said in Dead PanelDue 7I:

it has been sitting in its Anti Static bag for the last at least 48 hours

Hey! That was my fix! Glad it's working. Not sure this has ever worked before. Must have been a cosmic ray that flipped a bit somewhere...

@MikeD said in Dead PanelDue 7I:

Was going to down the line get a duet 5

You'll have to wait a while for Duet 5, we've only just got to Duet 3!

Ian