Micro-sectioning also know has cross-sectioning or metallographic preparations are used for PCB testing.
Opens or shorts
Processing failure due to solder reflow
Raw material evaluations
Solderability test work for a variety of applications and quality standards
PCB Coating Evaluation
The PCB failure analyst should have the experience to differentiate the various conditions and understand the requirements of the testing technique
3.PCB Contamination Testing
Contaminations can be the reason for part failure including degradation metallization Processing of printed circuit boards is taken place in an extremely clean environment designed to keep the component from contamination to be processed and assembly without part failure.
Copper etching liquid
Hot air leveling fluxes
Optical Microscopy may be one of the most popular testing methods many customers choose optical microscopy because of its speed and accuracy to detect faults and problems associated with soldering and assembly. The process of optical Microscopy uses a high power microscope with visible light this microscope can reach up to 1000X, has small depth field and shows features in a single plane.
Internal wire dress
Die attach quality
Voids in the sealing lid
Substrate/printing wiring board trace integrity
Insufficient Excessive or Poor solder