While there are many rework processes outlined by both rework equipment vendors and the IPC 7711/7721PCB rework and repair documents, there is a lack of repositories of application notes for non-mainstream laser-based PCB rework processes. Outlined in this writing are a variety of applications stories that make use of lasers as PCB rework tools.

Creative rework and repair solutions for PCBs are required where there are challenges in salvaging populated PCBs. One such innovative approach involves the use of lasers, which have become commonplace in PCB and stencil fabrication and are becoming more common so in the rework area.

While novel laser rework processes cannot be described in an all encompassing ‘how to’ applications guide, examples of their use as rework tools in the PCB and electronic device rework areas help to expand the possibilities in users’ minds of salvaging valuable PCBs. Several examples, including the demarking of a device, the creation of traces on an already-populated PCB, polyimide flex selective mask removal and PCB marking will be described herein as case studies on the use of lasers for reworking PCBs. 

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