[MinnowBoard] repair minnowboard power supply

[Douglas Kryder]

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>
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
>
> 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>
> 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> 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-bou
>>> nces at lists.elinux.org] *On Behalf Of *Patrick Mulder
>>> *Sent:* Friday, March 24, 2017 1:04 PM
>>> *To:* 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
>>>
>>>
>>>
>>> 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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>>> elinux-MinnowBoard at lists.elinux.org
>>> http://lists.elinux.org/mailman/listinfo/elinux-minnowboard
>>>
>>>
>>
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>>
>>
>
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