The current company I work for works mostly with automotive LED lighting as well as indoor and outdoor LED lighting. Large portions of the LED's we deal with are three or four dollars a piece, so scrap is not something we take lightly. What we have found useful is to have a special training program for repair and cell operators. We focus on correct hand soldering, component removal and solder joint repair of the LED's. During the hands on training session we attach thermocouples to the dies and leads of the LED's and attach them to a data logger. This helps train the operator on the correct time and temperature needed to repair an assembly without damaging the LED but still have an adequate solder joint. We also add the information to the process sheets and lock the temperature adjustments. In one application we plow air on the dome of the LED to keep the die from being damaged. Since the implementation of the program our scrap rates have gone down tremendously. Ted T. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 847-615-7100 ext.2815 -----------------------------------------------------