Looks like our problem with PCB solder mask separating after wave was caused by too much torque on screw used to hold down heatsink. Screw was torqued and then peelable mask was applied, after removal post wave delamination occurred. We set a hand tight limit on the scew/nut and the problem went away. I am still concerned with adhesion though and will address with board house since this is first time we see this issue and have many similar assemblies. Thank you all for your assistance. Dave Chapman -----Original Message----- From: David Douthit [mailto:[log in to unmask]] Sent: Sunday, August 10, 2003 11:43 PM To: [log in to unmask] Subject: Re: [TN] Cleaning of BGA sites after component removal;Re: [TN] Theattack of the Peelable Mask; [TN] SEI resistor not adhering on boardside Larry, Trying to save money no matter how much it costs is pandemic. David A. Douthit Manager LoCan LLC Larry Russell wrote: > Hello All, > > Three new sets of reliability problems in a day? Maybe the trend for always cheaper PCB's includes some quality issues? > Don't guess this is the last time getting more for less causes problems. > Personal results may vary. > > Larry Russell > CWI.com.tw > -----Original Message----- > From: Tempea, Ioan [mailto:[log in to unmask]] > Sent: Friday, August 08, 2003 11:45 PM > To: [log in to unmask] > Subject: [TN] Cleaning of BGA sites after component removal > > Hi Technos, > > I don't know why, but lately we get more BGA rework contracts. Some > customers come with batches of 40 boards, which I find huge for rework lots. > > And we noticed that it takes a lot of time and solder wick to clean the > pads. Not to mention the scratched solder mask and the pads coming out of > the substrate. > > What other cleaning methods or tools are there? > > Many thanks, > Ioan > > --------------------------------------------------- > Technet Mail List provided as a free 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/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a free 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/html/forum.htm for additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------