The explosive nature of the problem indicates to me a power supply short,
where the powersupply has a good size electrolytic capacitor attached to it.
Shooting molten copper is beyond spectacular. I have seen damaged and burned
runs, delaminated runs, but no shooting copper. I would expect some damage
beyond the local eruption if a big electrolytic capacitor is involved, e.g.
damaged isolation on some of the supply wires.
Or you have a component that developed a short, generated a very nice plasma
flame, burned the board, but where does the shooting copper come from?
Nice problem,
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil
Sent: Tuesday, 04 September, 2007 10:26
To: [log in to unmask]
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
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