Jul. 31. 2010 08:58
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Special examinations

In our laboratory respectively our metallography section, we carry out metallographic preparations, inspections and spectroscopy. The examinations can be evaluated on demand by our staff members.

Dye and pry tests are often used for the examination of BGA solder joints. Itīpurpose is the detection of cracks or micro cracks.
Therefor the assembly to be inspected is cleaned of surface contaminations or flux residues. After drying, a penetrator fluid is injected under the BGA. The assembly is then put into a vacuum for a short time and dryed in an oven afterwards. After cooling, the BGA is mechanically removed from the PCB. With an optical inspection, it is then possible to see where the dye has penetrated the solder joints and therefor cracks or micro cracks are present.

Dye and Pry Test

The upper two solder joints are wetted by the penetrator fluid, this indicates a crack, the lower two are clean and therefor correct.

Combined tests