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April 2002

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Subject:
Re: Shorts in PLCC Sockets
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 23 Apr 2002 10:24:39 -0700
Content-Type:
text/plain
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text/plain (50 lines) 
Andre,

If the flux gets in there so will the solder!

David A. Douthit
Manager
LoCan LLC

Andre Leclair wrote:

> We have recently run across a situation which has baffled us.  On the PCB
> in question there are 4 Wave soldered PLCC sockets. 1 of these is being
> reported as having solder shorts underneath.  On the returned units we x-
> rayed the sockets ( can't see under) and found shorts on 1 socket location
> only.  The shorts were consistanly on the same pin area for all the sockets
> were the shorts were found.  We removed a socket only to find the board
> very clean underneath...no shorts..
> The socket has a bottom retainer to hold all the pins in place.. This was
> pried off and to our surprise there was the short.. inside the connector.
> The amount of solder was enough to surround 3 pins in 2 seperate areas.
> The hole around the pins in the plastic base is no more then 0.002".
>
> Does any one have any idea how solder could have gotten up inside the
> connector ( consistantly in the same location)? Or has any one seen this
> before?
>
> We have run this assembly several times in the past with no difficulty.
>
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