In order to help the engineers to improve quality level and reduce the failure rate in using of LED product, we should realize the failure mode, failure mechanisms and root causes of this kind of products. First, more than 300 failure analysis cases about LED product have been carried out by the authors. And the authors made a summary of these cases. The main failure modes of LED products are introduced. Then, based on these failure modes, the possible mechanism of each type of failure mode and the root causes of failures are analyzed in detail. Finally, a lot of cases are used to support the analysis in this article. All failure modes, corresponding failure mechanisms and root causes are summarized in a form for reference to engineers and technicians engaged in failure analysis and product improvement. The failure mode of LED products in the use is no light, or intermittently no light, or light intensity weakening, or device burnout. But its failure mechanism and related reasons are quite complex, such as the chip quality, packaging process, heat dissipation channel design and derating design related to LED.
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