Ralph,
Found the same issue on VLP BGA design with just one side populated.
Root cause was determined to be PCB warpage.
Thanks,
Herminia
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor G. Hernandez
Sent: Wednesday, August 01, 2007 7:36 AM
To: [log in to unmask]
Subject: Re: [TN] Problems with Memory modules and sockets
Have you inspected the socket in which the DIMM insert into.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ralph Rottnick
Sent: Wednesday, August 01, 2007 4:14 AM
To: [log in to unmask]
Subject: [TN] Problems with Memeory modules and sockets
Hi all,
I got a feedback from the market that some modules are causing problems
during insertion to sockets. Significant is that the problems occur just
with
PCBs from one supplier. I made correlation between different suppliers
but I
could not find differences in any dimensions. All of the boards are not
chamfered. Thickness is always within spec of 1.27 +/-0.1 mm. The boards
have 240 pins.
Is anybody out there who has experience in that? Are there any
influences
related to core materials, gold hardness, gold finger design? Or is this
more
socket related?
What are potential rootcauses?
Thanks in advance.
Ralph
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