PIC18F4850 will not oscillate

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  1. - 21st March 2011, 09:25 #1
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    Default Re: PIC18F4850 will not oscillate

    Hi,
    It looks like all your smt caps are shorted in the PCb traces, is that possible ?
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  2. - 4th April 2011, 23:27 #2
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    Default Re: PIC18F4850 will not oscillate

    Joe,

    I am not sure what you mean. Are you saying if maybe the caps got shorted when solder?mmm... you know what I have not checked on that.

    After opening a ticket with Microchip, they could not help me much either. They thought that maybe I damaged the crystal when I solder it. Which I suppose it could be a possibility.

    Since I had to order new boards anyways, I placed the XTAL closer to the PIC (Maybe 15-30mils closer) and the new boards work fine. So I am not sure what happen before but I guess it is one of those items I will not find out what happen without using up more time that I already have.

    Thanks for the help.
  3. - 6th April 2011, 04:17 #3
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    Default Re: PIC18F4850 will not oscillate

    Not a solder bridge, but copper where it should not be? Looks like the traces bridge the caps and some other components. Looks like exacto knife time.Name: shoer.JPG Views: 1313 Size: 111.6 KB
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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  4. - 12th April 2011, 17:19 #4
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    Default Re: PIC18F4850 will not oscillate

    Joe,

    I see what you mean now. My bad, the layout I uploaded is black and white, and the component bodies are part of my capture. Those aren't really copper, they are just the bodies of the components.
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