³Ô¹Ïtv / ENGINEERING EXPLANATIONReview sequence: BGA Underfill Selection1NeedIdentify the actual mechanical or reliabilityobjective.2ModelDifferential displacement is not stress orfatigue life.3SequenceKeep material, cleaning, dispense, cure andinspection linked.4RepairAgree disposition before committing toreinforcement.Illustrative geometry only. Not to scale, a production setting or evidence of qualification.