Electronics Forum | Thu Feb 22 13:11:51 EST 2001 | keithtbe
Silver epoxy is used to joint the LED beam lead and the trace of the flexi circuit. Due to the LED mounted skew upward or downward unconsistently, the strength of the joint weakened and causing the LED lights up intermittently. I would like to ask fo
Electronics Forum | Tue Sep 10 08:46:10 EDT 2013 | rway
You're in the wrong forum. I doubt anyone here will have any experience with your type of issue (without researching it). Have you tried the dealer or a dealer related forum?
Electronics Forum | Mon Sep 09 11:18:23 EDT 2013 | shirjer
We have a Vansco system on our 2005 Alpine Coach motor home. We have an intermittent outage problem with the 12V lighter socket. I can plug something in, like the tire sensor monitor, or the GPS, and after I remove it, the outlet no longer works, n
Electronics Forum | Mon Oct 02 19:04:53 EDT 2006 | DC
We had a issue on the SBGA and found stress built up at the corner of the SBGA after cool down to room temperature. It is confirmed by the warpage analysis. I expected that the stress caused by the heat spreader and the epoxy to the copper frame. O
Electronics Forum | Tue Oct 10 16:27:21 EDT 2006 | slthomas
No but the owner of the last company I worked for used to think prying PLCCs off the board with a screwdriver (using an R0805 as a fulcrum and crushing it in the process) was a valid test. "Feels pretty weak...our intermittent failure must be a pro
Electronics Forum | Thu May 24 22:26:08 EDT 2007 | slthomas
Of course we all know those intermittent failures never come back after a successful Monday a.m. boot. ;)
Electronics Forum | Thu Oct 24 12:09:31 EDT 2002 | slthomas
Have you looked at cross-sectional analysis? If they can provide you details of where the failures are occurring, maybe you can chop one up and see exactly what's going on? We've done it once for our own engineering department and the results (not
Electronics Forum | Thu Jul 02 16:01:57 EDT 2009 | ewchong
thanks kpm. agree the cause of those pads lifting. all of them were no connects so they cannot be the cause of the electrical failure. when the bga was removed, all the solder balls on the pcb turned into conical shape due to the separation, except
Electronics Forum | Tue Jul 07 05:55:34 EDT 2009 | kpm135
I agree with your assessment of the two pins with irregular solder. The head-in-pillow or broken joint are both probable events for your defect. At this point in the process it will probably be difficult to pinpoint the exact cause. If it was a broke
Electronics Forum | Mon Jul 07 00:22:38 EDT 2003 | sam
Thanks for all the answers. I should clarify that the problem was found to be on the SMT LED gold plating, instead of PCB gold plating. We had confirmed this problem by running some DOE experiments and some reliability testings. We had decided to d
