Patent ID: 7666321
Filing Date: 2010-02-23
Classification: H01L

Abstract:
1. A method for decapsulating a package, comprising: providing a package having a chip therein, wherein the chip has an active surface and a rear surface and the package further comprises: a heat sink disposed over the rear surface of the chip; a plurality of solder bumps disposed on the active surface of the chip; a substrate, wherein a first surface of the substrate is connected with the chip through the solder bumps; an underfill disposed between the chip and the substrate and filling between the solder bumps; a plurality of solder balls disposed on a second surface of the substrate; removing the heat sink; removing the substrate together with the solder balls; performing a dry etching process to remove a portion of the underfill; performing a wet etching process to remove the rest portion of the underfill; performing a thermal process to melt the solder bumps; and performing a solder bump removal process to remove the melted solder bumps from the active surface of the chip.