[MinnowBoard] repair minnowboard power supply
Douglas Kryder
dkryder at gmail.com
Sat Mar 25 00:26:36 UTC 2017
i have 4 left and would like to keep 2 so i can send you 2 if that would
help you. just email me a shipping address and i will put them in the mail
tomorrow. dkryder at gmail.com
On Fri, Mar 24, 2017 at 5:15 PM, W Paul Mills <W.P.Mills at wpmills.com> wrote:
> <https://www.arrow.com/en/products/nct3012str/nuvoton-technology>
>
> On 03/24/2017 07:05 PM, Douglas Kryder wrote:
> > i do have some spare NCT3012S which came from digikey when i had the
> > same problem.
> >
> > On Fri, Mar 24, 2017 at 4:30 PM, Patrick Mulder
> > <mulder.patrick at gmail.com <mailto:mulder.patrick at gmail.com>> wrote:
> >
> > Thanks! Yes, i could measure the voltage out of U35 is 0V with input
> > 5V, so, indeed it's the problem.
> >
> > One sub problem is actually sourcing the Nuvoton part:
> >
> > http://media.digikey.com/pdf/Data%20Sheets/Nuvoton%20PDFs/
> NCT3012S_RevA0.pdf
> > <http://media.digikey.com/pdf/Data%20Sheets/Nuvoton%20PDFs/
> NCT3012S_RevA0.pdf>
> >
> > I see Nuvoton is a Taiwanese company; trying to get in touch with a
> > local supplier.
> >
> >
> > On Fri, Mar 24, 2017 at 11:57 PM, Douglas Kryder <dkryder at gmail.com
> > <mailto:dkryder at gmail.com>> wrote:
> >
> > yes, it is U35 which goes bad. it takes some soldering skills to
> > replace it.
> >
> > On Fri, Mar 24, 2017 at 1:54 PM, Krau, Michael P
> > <michael.p.krau at intel.com <mailto:michael.p.krau at intel.com>>
> wrote:
> >
> > If I remember correctly, (from back in the early days, when
> > this was a more common event):____
> >
> > __ __
> >
> > The schematic page 22 is of more value. I believe when
> > 12vts is applied, the chip U35 was the first (and usually
> > only) part to go south. ____
> >
> > __ __
> >
> > Though there should be some discussion of this in earlier
> > threads (about 2 + years ago). ____
> >
> > __ __
> >
> > Sincerely,____
> >
> > __ __
> >
> > Michael Krau____
> >
> > ____
> >
> > *From:*elinux-MinnowBoard
> > [mailto:elinux-minnowboard-bounces at lists.elinux.org
> > <mailto:elinux-minnowboard-bounces at lists.elinux.org>] *On
> > Behalf Of *Patrick Mulder
> > *Sent:* Friday, March 24, 2017 1:04 PM
> > *To:* elinux-minnowboard at lists.elinux.org
> > <mailto:elinux-minnowboard at lists.elinux.org>
> > *Subject:* [MinnowBoard] repair minnowboard power supply____
> >
> > __ __
> >
> > Hello,____
> >
> > __ __
> >
> > unfortunately, I applied 12V instead of 5V on the DC
> jack.____
> >
> > __ __
> >
> > Now, only 1 of 2 diodes is lightning up.____
> >
> > __ __
> >
> > I am looking at:____
> >
> > __ __
> >
> > http://wiki.minnowboard.org/images/b/bd/Minnowboard_
> Turbot_X205_Sch.pdf
> > <http://wiki.minnowboard.org/images/b/bd/Minnowboard_
> Turbot_X205_Sch.pdf>____
> >
> > __ __
> >
> > p. 29:____
> >
> > __ __
> >
> > 5 V DC --> NMOS and Switching supply . Not sure where to
> > look for the broken IC from this. What could I do to repair
> > the board?____
> >
> > __ __
> >
> > Thanks a lot!____
> >
> > __ __
> >
> > Patrick____
> >
> > __ __
> >
> >
> > _______________________________________________
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> > <http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
> >
> >
> >
> >
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> >
> >
> >
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>
> --
> /**********************************
> * W. Paul Mills - Topeka, KS, USA *
> **********************************/
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