Patent ID: 8084298
Filing Date: 2011-12-27
Classification: H01L

Abstract:
1. A method for replacing a semiconductor chip of a flip-chip module, the semiconductor chip comprising contact posts on a surface, which are disposed approximately at right angles to the surface, which have end surface areas at their free ends, and a substrate having contact points with surface areas connected respectively with the end surface areas of the contact posts by soldered connections, wherein the contact points are raised relative to the surface of the substrate and the end surface areas of the contact posts cover the respective surface areas of the contact points, the method comprises: heating existing soldered connections above a flow point of said contact posts having been soldered to the raised contact points, whereby the end surface areas of the contact posts are larger than the surface areas of the raised contact points; pressing together the semiconductor chip and the substrate to press the solder almost completely away from the end surface areas of the contact posts and the surface areas of the raised contact points; reducing a temperature of the soldered connections prior to removal of the chip in order to somewhat solidify the solder so that a majority of the pressed out solder adheres to sides of the contact posts; and removing the semiconductor chip from the substrate with the majority of the solder adhering to the sides of the contact posts, whereby cleaning of the raised contact points is not required to accommodate soldering the same or another semiconductor chip to the raised contact points, and cleaning of the contact posts is not required to accommodate soldering the contact posts of said semiconductor chip to the same or other raised contact points.