Hi, we use PCB ENIG surface for tiny components but I would say that PCB tin surface does not influence on LED function. J.Janoch, Des. Dpt. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Prasad AN Sent: Wednesday, September 29, 2004 10:14 AM To: [log in to unmask] Subject: [TN] Reliability issue in 0402 soldering Hi all We are assembling around 750 # of 0402 size LEDs in small PCB of size 65mm X 65mm. The problem we are having after reflow, when PCB is tested all the LEDs are glowing. But after some time the problem starts with 3-4 LEDs not glowing. The PCB surface is of Tin plating. Let me know is the PCB surface is suitable for this type of board. If not what type of surface is recommended for PCB with only 0402 LEDs. Thanks with Warm regards A.N.Prasad --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------