Subj : USB port issue -follow-up
To   : Ky Moffet
From : Barry Martin
Date : Tue Mar 10 2020 08:06:00


Hi Ky!

 >   KM> Or if maybe the internal ground is loose, perhaps on the USB
 >   KM> connection to the mainboard.
 > Hmmm...  Possibility.  A static discharge to the case could still jump
 > to the USB section, just looks like a different/another problem.  Right
 > now trying to figure out where to begin other than an almost complete
 > rebuild.  ...Suppose the first thing would be to open the case and see
 > if anything looks wrong.  Let things 'sit' a while and see if I remember
 > anything which didn't seem to go as should during construction -- like
 > something having to be forced.
 KM> Might be nothing you can see, unfortunately. Broken spot in a
 KM> trace, loose wire up inside a port... who knows....

Right: plus bad solder joint - could be literally anything anywhere.  
Opening the case to look for anything obvious is probably as far as I'd 
go: not going to look at the board with a magnifying glass - probably 
one the sandwiched type and the problem is in a middle layer!


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