Gil,
Is this a howitzer of some kind?
What motherboard? Computer or servo system or medical apparatus or what?
We may get a clue if you could describe the board a little. How many
layers? Power supply capability? Fuses? Connector size? Capacitor size?
Is this an office box, outdoor working, in a vehicle or what? Sounds to
me as not being an office machine. 50 Volts is a lot. You may get some
100 amperes of current during milliseconds, which means maybe a 5,000
Watt spike, enough to cause severe damage. My first idea is an incoming
transient. Have you checked the status of the components on the board.
That should be first step. Finally , I don't think the cause is the
board. Start checking the components. Blown power tyristors, FETs,
transistors? Look for cooling problems, number one today. Check
inductors, DCDCs, tranformers, if there are any on the board. Look for
overheated components that can have melted solder in PTHs. Wished I had
that board on my desk, very delicate case!
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil
Sent: den 4 september 2007 19:26
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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