Hi Liew
The problem could be because of delamination of BGA happened in reflow
process. The delamination maybe due to BGA exposed to moisture for long
time.
Thanks with Warm regards
A.N.Prasad
Sr. Engineer - Projects
88A, Electronics City,
Hosur road,
Bangalore - 560100
+91-80-8520022 Tel
+91-80-8521022 Fax
[Flextronics Internal Use]
-----Original Message-----
From: Liew, Sen Joon [mailto:[log in to unmask]]
Sent: Monday, April 12, 2004 9:40 AM
Subject: Re: BGA soldering issue
Hi, David,
The finish on the board was HASL. Is it totally unacceptable for prototypes.
The pitch of the BGA is
1.0mm.
Thanks.
Best regards,
SJ Liew
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of David Douthit
Sent: Wednesday, April 07, 2004 11:26 AM
To: [log in to unmask]
Subject: Re: [TN] BGA soldering issue
What kind of finish was on the PCB (ENIG, Tin, Silver, OSP)?
What was the thermal profile during manufacturing?
How moisture sensitive was the part?
What were the storage condtions for the part and the PCB?
Is there part and/or board warpage?
This is a fair start at solving this issue.
David A. Douthit
Manager
LoCan LLC
Liew, Sen Joon wrote:
>Dear Technetters,
>
>We encountered BGA chip having intermitten contact issue in our prototypes.
When we pressed hard on the BGA chip, the prototype worked ok. We need
advice
>on how to tackle this issue from prototype building's point of view. What
measures should be taken to make sure "no contact issue" during prototype
building.
>
>Your advice is very much appreciated. Thanks in advance.
>
>Best regards,
>SJ Liew
>
>
>
>
>
>---------------------------------------------------
>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
847-509-9700 ext.5315
>-----------------------------------------------------
>
>
>
>
---------------------------------------------------
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
847-509-9700 ext.5315
-----------------------------------------------------
---------------------------------------------------
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
847-509-9700 ext.5315
-----------------------------------------------------
---------------------------------------------------
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 847-509-9700 ext.5315
-----------------------------------------------------
|
