Patent ID: 8518722
Filing Date: 2013-08-27
Classification: H01L

Abstract:
1. Method for detecting the under-fill void in flip chip BGA, comprising: providing a substrate having an interconnect structure and a plurality of interposers therein; providing a chip having an active surface and a back surface, and a plurality of first connecting elements on said active surface; mounting said chip on said substrate by inverting said chip so that said active surface of said chip faces said substrate, and said plurality of first connecting elements of said chip being electrically connected with said interconnect structure by said plurality of interposers; performing at least one IR reflow process to fix said plurality of first connecting elements on said substrate; performing a molding process to fill a molding material to encapsulate said active surface of said chip and said plurality of first connecting elements; forming a plurality of second connecting elements on a back surface of said substrate to accomplish a flip chip ball grid array package structure; and performing a detecting process to detect a void being not formed in a connecting interface between said plurality of first connecting elements and said active surface of said chip, after said step of performing said molding process, and between said step for said performing a molding to fill a molding material process and said step for said forming a plurality of second connecting elements on a back surface of said substrate.