Lyon: Are these pads "no connects" meaning they have no connection to outside routing. If this is the case you may not need to worry about the missing pads. They can be easily repaired using either the epoxy or or dry film technique as prescribed in IPC-7721. Bob On Wed, Sep 4, 2013 at 5:52 AM, Gumpert, Ben <[log in to unmask]> wrote: > Lyon, > > By 'pad drop' do you mean lifted pads? (Pads stayed with the BGA?) > Usually this means that there wasn't enough heat - that the solder was not > melted in all locations. > > Ben > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Lyon Yuan > Sent: Wednesday, September 04, 2013 6:40 AM > To: [log in to unmask] > Subject: EXTERNAL: [TN] BGA pad drop > > guys,we found a few BGA pad drop after removed from pcba boards.what is > reason to cause the issue > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > -- 1. Bob Wettermann 847-767-5745 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________