Dear Khun Vorapoj and Khun Tawanrat,
In regards to AL round board claims as mentioned by kh.John in the previous e-mail, we receive new 5 NCRs in Apr from our customer (pls. see table below). All failure boards will be returned to you within this week.
Based on the results of your investigation for the previous NCR (faulty 7 pcs from 50pcs), we believe that the LEDs might not be the real root cause. It should have other potential root causes that have not been addressed and solved yet. We would appreciate your immediate attention on performing the failure analysis, and please propose us the corrective and preventive actions to prevent such problems from occurring. We hope you can help us eliminate this problem as soon as possible.
Furthermore, could you please advise us on the status update of the testing method development? We would like to set up the equivalent testing method at WE-EF.