3 ms·
I had an electronic module that worked in our lab, but failed at the customers, but then worked again in ours. Turns out one of the pins in a space grade conne
by madengr 8y ago
I had an electronic module that worked in our lab, but failed at the customers, but then worked again in ours.
Turns out one of the pins in a space grade connector (MDM-25) open-circuited exactly between 68F and 70F. Our lab was 70F, and the customers was 69F. The way we caught it was to be watching the temp chamber when it slowly ramped from cold to ambient.
Turns out the connector supplier had shifted production to Mexico, and they were contaminating the contacts with RTV when sealing it.
- gerdesj 8y agoYou have the skills to diagnose this sort of thing but I suspect that a mere Unix sysadmin (soz: "herder") doesn't. For the likes of Chris and me: put in a new mobo and move on, is surely the fix that any techy would do.
- madengr 8y agoYou can selectively hit areas with cold spray (i.e. duster turned upside down). Could be a bad/oxidized connector, cracked solder joint, tombstoned part. Only worth diagnosing it for curiosity.
- gotocake 8y agoBe careful when using duster that way, some of them leave a white, powdery residue.
- gloflo 8y agoRTV?
- gotocake 8y agoIt’s a type of silicone rubber: https://en.m.wikipedia.org/wiki/RTV_silicone https://en.m.wikipedia.org/wiki/RTV_silicone