Hi Gil! Looks like you found a way to share your photos. Picasa is a pretty neat way of doing that and it's free! I created my web page before there was something like Picasa out there so that if a Technetter wanted to share a photo with the list, they could do that. But now it looks like the need for my page is going to be obsolete now... (:^( Thanks Google! (just kidding) But, if you ever want a picture posted on my page, you just need to email them to me and I'll post them. Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil Sent: Monday, September 10, 2007 10:12 AM To: [log in to unmask] Subject: [TN] Help needed on motherboard failure analysis-Update Hello Technet and thanks to all for your help. Below is a links to some photos (How could I upload photos to Steve's site?). The board contains only connectors to which other modules are connected (no passive or active components). The board is FR4 with 28 layers. There are Ground holes with retaining screws (and its looks like it connected to the failure). Their was a protective fuse that blow after the failure. I am checking the modules that were attached to the board. No sign to failure, yet. A month before the failure a cooling liquid (ethylene glycol) was spilt on the board and did not cleaned up (just drying it). I am doing analysis on residues found on the screwing (but it could be Loctite). I will keep you update on the finding (cross section, x-ray, etc.). Regards, Gil http://picasaweb.google.co.uk/gil.zilber/Board - ----- Original Message ----- From: "Zilber Gil" <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, September 04, 2007 1:25 PM Subject: [TN] Help needed on motherboard failure analysis > Hi, > > Recently one of our motherboard failed. It reaches very high temperature > that melts the copper and explodes shooting (from the side of the board) > the melt copper to over 20 cm. the shooting hole cause delamination of > the board in the area. A lot of black smoke and was also seen. The max > voltage of the board is about 50V. The board worked fine for more then a > year. What could be the failure mechanism? Could it be due to conductive > filament formation (although the PCB should be free of that)? > > Thanks > > Gil Zilber > Elta Systems > > The information contained in this communication is proprietary to Israel > Aerospace Industries Ltd. > and/or third parties, may contain classified or privileged information, > and is intended only for > the use of the intended addressee thereof. 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