Hi Dave, I don't understand what you mean by masking the topside of the BGA, but for future designs my advice would be to use dedicated testpads on the bottomside so you don't need filled via's anymore. And how about changing the testneedles ? As a third option, because I don't want to spoil your Happy Monday, I'd say look at the bright side: 252 perfect solder joints per BGA !! Regards, Daan Terstegge PCB Assembly Department Thales Communications Tel +31(0)35 524 8297 Fax +31(0)35 524 8181 [log in to unmask] **This message is Unclassified** >>> [log in to unmask] 04/28/03 04:02pm >>> Happy Monday, I have a BGA 256 Tundra which has no shorts in SMT (we x-rayed all 16 boards) When it goes over the wave we get a short or two. Please assume the wave is in control. We mask the topside of the BGA because there are a lot of vias which when they test it would leak and not get pulled down good in the fixture. I need the vias on the bottomside under the BGA to be filled with solder for testing so I can't mask the bottom. What should I do? Dave Chapman Manufacturing Engineer Circuit Service Inc. --------------------------------------------------- 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 ----------------------------------------------------- -------------------------------------------------------------------------- DISCLAIMER: The information contained in this communication is confidential and may be legally privileged. It is intended solely for the use of the individual or entity to whom it is addressed and others authorized to receive it. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or taking any action in reliance of the contents of this information is strictly prohibited and may be unlawful. Stork is neither liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt --------------------------------------------------- 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 -----------------------------------------------------