I agree. Etchback looks reasonable but the electroless or DM never
caught on the kapton/adhesive layer. Parts would still pass electrical
since there appears to be some copper joining on at least part of the
barrel.
Steve Kelly
PH: (416) 750-8433
FAX: (416) 750-0016
CELL: (416) 577-8433
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix
Sent: Tuesday, November 29, 2005 5:18 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
>
>---------------------------------------------------
>Technet Mail List provided as a service by IPC using LISTSERV 1.8e
>To unsubscribe, send a message to [log in to unmask] with following text
in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at:
http://listserv.ipc.org/archives
>Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>for additional information, or contact Keach Sasamori at [log in to unmask]
or
>847-615-7100 ext.2815
>-----------------------------------------------------
>
>---------------------------------------------------
>Technet Mail List provided as a service by IPC using LISTSERV 1.8e
>To unsubscribe, send a message to [log in to unmask] with following text
in
>the BODY (NOT the subject field): SIGNOFF Technet
>To temporarily halt or (re-start) delivery of Technet send e-mail to
>[log in to unmask]: SET Technet NOMAIL or (MAIL)
>To receive ONE mailing per day of all the posts: send e-mail to
>[log in to unmask]: SET Technet Digest
>Search the archives of previous posts at:
http://listserv.ipc.org/archives
>Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16
>for additional information, or contact Keach Sasamori at [log in to unmask]
or
>847-615-7100 ext.2815
>-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
