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September 2005

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Subject:
From:
Jana Carraway <[log in to unmask]>
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Date:
Fri, 16 Sep 2005 16:32:19 -0700
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The only way to be completely confident the rework corrected the original
problem is to perform the rework bake, then 100% cross-section the boards to
inspect for delamination.  Perhaps you can ask the supplier to perform this
test?

Jana Carraway
MSEI - Advanced Technology Group
6024 S.W. Jean Road
Lake Oswego, OR  97035
503.697.5291, ext 1180
email: [log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Mumtaz Bora
Sent: Thursday, September 15, 2005 6:21 PM
To: [log in to unmask]
Subject: [TN] Rework for Delaminated PWBs


Dear Technetters,


We have received a large batch of PWBs that is showing delamination after
reflow at peak temp. 230C. Laminate is high Tg - 170C.

Supplier is proposing to perform the following rework -- on these boards
instead of providing replacement parts.

  Oven bake at 190C for 2.5 hours followed by second bake at 150C for 2
hours at 6kg/cm2 pressure. Will this guarantee a full cure?

I am concerned about latent failures and layers opening up as full cure was
not achieved the first time.

Any inputs from the forum will be appreciated.

I will request Steven Gregory to place the image of delamination on his
website.  Have a great weekend.
Thank-you

Mumtaz

  D/ 252 - SMT Process and Component Quality
  Bldg. V238E
Voice  (858)-882-1967
Fax    (858)-882-3126
Page  (858)-635-1180
Cell:   (858) -449-7054
email: [log in to unmask]
Kyocera-Wireless Corp.
10300, Campus Point Drive

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