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khurram
Joined: 20 Apr 2004
Posts: 12
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 30 Aug 2004 4:32 Board hangs when taped |
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hi,
i have desgin a board using a 386ex up in tq144 package. there a big problem when ever i tap the board it hangs even a small jurk hangs it.
i think it is solding problem ,
any one has suggestions or any one has encounter this problem before
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echo47
Joined: 07 Apr 2002
Posts: 4206
Helped: 566
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30 Aug 2004 6:46 Board hangs when taped |
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That's a frustrating problem, especially if it takes a while to reboot the system between failures.
I usually use a thin plastic or wooden stick to gently tap the board at various locations until I find the sensitive area. Then I inspect the area with a microscope. If I'm lucky, I'll find a poorly soldered pin. If I'm unlucky, it'll be a hidden cracked PCB trace or intermittent via.
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30 Aug 2004 6:46 Ads |
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brmadhukar
Joined: 21 Jun 2002
Posts: 844
Helped: 29
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30 Aug 2004 17:27 Re: Board hangs when taped |
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Hi,
This is a very common problem encountered whrn one of the pins is not properly soldered. The best thing is to "retouch" all the pins. The local solution is to make sure all the ground pins are indeed grounded. This is to find which paticular pin is a problem.
B R M
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Ante
Joined: 01 May 2004
Posts: 177
Helped: 4
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30 Aug 2004 19:38 Re: Board hangs when taped |
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Sometimes freeze spray will help finding the problem “spot” in cases like this.
Ante 
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