[MinnowBoard] repair minnowboard power supply

[W Paul Mills]

<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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> 
> 
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> 
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-- 
/**********************************
* W. Paul Mills - Topeka, KS, USA *
**********************************/