Obviously sounds heat related. Look for barrel cracks in the vias. Often, barrel cracks don't get detected during normal electrical testing done at room temp but show up when heated. Paul Terranova Digital's Analytical and Environmental Test Services Lab 508-467-3109 [log in to unmask] ---------- From: Christy Graham[SMTP:[log in to unmask]] Sent: Wednesday, March 11, 1998 2:19 PM To: [log in to unmask] Subject: [TN] ASSY: Intermittent Short TechNet, I was told recently of a printed circuit card assembly that, when the assembly is powered up in the morning, the board runs, but that by the afternoon, it fails. Next day, same board, same results. The engineer thinks this problem is due to a "flux short". Is this possible? Christy Graham [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################