LISTSERV - TECHNET Archives - LISTSERV.IPC.ORG

TECHNET Archives

July 1999

TechNet@IPC.ORG

	LISTSERV Archives
	TECHNET Home
	TECHNET July 1999

	Log In
	Register

	Subscribe or Unsubscribe

	Search Archives

Options:	Use Monospaced Font Show Text Part by Default Show All Mail Headers
Message:	[<< First] [< Prev] [Next >] [Last >>]
Topic:	[<< First] [< Prev] [Next >] [Last >>]
Author:	[<< First] [< Prev] [Next >] [Last >>]

Subject:	Re: Freeze Spray and BGAs
From:	Gregg Klawson <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 28 Jul 1999 08:45:51 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (42 lines)

At 05:01 PM 7/27/99 -0700, Darrel Therriault wrote:
>TechNet,
>
>A curious situation happened when we used freeze spray on a BGA; it quit
>working.
>
>The BGA seemed a bit hot to the touch and we were getting some flakey
>operation, so
>we decided to hit it with some freeze spray.  It quit working altogether.
>
>I have not had a chance to check out the package for a failure mechanism, but
>I will be replacing it to see if it was that part causing the failure.
>
>Does anyone know of any specific thermal issues with using freeze spray on
>BGAs??
>We use both TBGA and PBGA, so I thought I'd ask the question before I go and
>inadvertently destroy more of our parts.
>
>Regards......DT

If the BGA operation was "flakey" prior to the freeze spray then you may have just accelerated an intermittent failure into a hard failure.  Hitting a hot (I assume plastic) BGA with freeze spray will give it a bit of a thermal shock - thermal shock's can accelerate and also create mechanical failure mechanisms.  So it's certainly possible that Bev's mechanical contact scenario could have been at play here.  I've seen poorly reflowed BGA's which could be made to function by pressing on them with a finger, something you may want to try here.

When using any spot cooling or heating tools/fluids one must consider ESD, electrical properties if a fluid is used, thermal shock damage, min/max temperature of the component/board.  My recommendation is to go slow.

Good luck.
-- Gregg
[log in to unmask]

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################

ATOM RSS1 RSS2

LISTSERV.IPC.ORG