Hi,
And what happened to the adhesive between the polyimide where the ring void
is? There seems to have been a problem with the hole prep after drilling.
Usually see the oposite, where the electroless process causes the adhesive
to swell into the hole. Here it looks like something has washed away the
adhesive at the sight of your problem.
Chuck Brummer
AIM/Siemens
-----Original Message-----
From: Dwight Mattix [mailto:[log in to unmask]]
Sent: Tuesday, November 29, 2005 2:18 PM
To: [log in to unmask]
Subject: Re: [TN] Via Cracking in flex cable
Mumtaz,
Tian says to take good care of you. ;-)
Curious what the experts here will say.
I'd call it a ring void in the electroless resulting in thin DC plating and
circumferential cracking.
Any idea what type of electroless (or direct metallization) system was used
prior to electroplate?
An electroless plating skip on that L1-2 dielectric wuold explain the shape
of plating in the hole (tapering in from far side -- decreasing current
density as it approaches open area).
dw
At 01:45 PM 11/29/2005, stephen gregory wrote:
>Hi Mumtaz!
>
>Sorry it's taken me a while to get your pictures posted, but I'm home in
>North Carolina visiting my family, and I'm on a dial-up connection at a
>blazingly fast 26.4kb! WOOO-HOO!!!
>
>(DSL has sure spoiled me...)
>
>Anyways, go to:
>
>http://www.stevezeva.homestead.com/files/FlexCableCracks.jpg
>and
>http://www.stevezeva.homestead.com/files/FlexCableCracks2.jpg
>
>Kind regards,
>
>-Steve Gregory-
>Mumtaz Bora <[log in to unmask]> wrote:
>Dear All,
>
>We have an issue with flex cables cracking in cellphone
>assembly. X-sections are showing voids, some residue and cracking in the
>via. It appears to be a combination of smear remove and copper plating
>problem. Any insight from the flex circuit and plating experts will be
>appreciated. I have asked Stephen Gregory to post the X-sections on his
>website.
>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
>San Diego, Ca 92121,USA
>
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