Good idea! 

earth all of one side to check the via's 

"metal cotton"
Is called wire wool

  PC

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of microsoftwarecontrol
> Sent: Wednesday, April 27, 2005 8:14 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] my led driver messed up.
> 
> 
> exactly, pcb fault caused the problem and
> very hard to locate it.
> 
> I met such situation twice recently. 
> It seems even for home made pcb,
> quality assuarance is still needed!
> 
> Such as via quality. I think of
> using metal cotten at bottom been
> connected to one pole, and another
> pole of meter goes through every via.
> Any body has same thought?
> 
> BR,

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