Hi Ramakrishman, In general, there is a number of various tests to figure out what could have caused the problem. Some of them are X-sectionning, SEM/EDS, FTIR. It's difficult, though to say which ones should be used in your specific case without seeing the actual sample. ------Original Message------ From: Ramakrishnan Saravanan Sender: TechNet To: [log in to unmask] ReplyTo: TechNet E-Mail Forum ReplyTo: Ramakrishnan Saravanan Subject: Re: [TN] corrosion under Solder Mask Sent: Mar 2, 2013 20:15 Dear Mr Vladimir.i Goshev, Thank you for the reply. Sorry being ignoramus , what are the possible FA actions to be carried out to fins the root cause of the problem. regards, R.Saravanan Regards, Vladimir SENTEC Testing Laboratory Inc. 11 Canadian Road, Unit 7. Scarborough, ON M1R 5G1 Tel: (647) 495-8727 Cell: (416) 899-1882 www.sentec.ca ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________