Locating BGA Joint Failures

摘要

THIS MONTH WE show examples of testing BGAs with a "dye and pry," a simple and cost-effective way of looking at joint failure or their condition after some form of mechanical testing or abnormal assembly practice. FIGURE 1 shows a sample BGA joint after dye-and-pry testing. Eighty percent of the separated surface is covered by the red dye. This clearly shows separation occurred before the dye was added.