The dreaded "No Device Detected" error


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  1. #1
    Join Date
    Jan 2009
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    California, USA
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    Default The dreaded "No Device Detected" error

    Well... I just loaded up a "new" (untested design) board with a 16F684 and assorted goodies. When I went to program it, I got the dreaded "No Device Detected" error...
    Yes, I DO have 16F684 selected in MCS.
    I've checked very carefully and all PIC pins are soldered to the board and there's no pins shorted together.

    I ran the troubleshooting routine from PICkit2, and all seems good. I've got 5 volts on VDD, 0 volts on Vss, 12 volts on Vpp (Mclr), and I get nice clean 30Khz test waveform on ICSPDAT and ICSPCLK.
    According to the test routine, everything looks O.K.

    Is there anything else I should check before I replace the PIC?
    I rather dislike unsoldering and replacing TSSOP parts...


    Thanks!


    steve

  2. #2
    Join Date
    Jan 2009
    Location
    California, USA
    Posts
    323


    Did you find this post helpful? Yes | No

    Default My PIC was broken

    I heated the little devil up with the air gun and plucked it off the board with tweezers... and pin 13 (ISCPDAT) stayed on the board!

    Somehow pin 13 was physically broken and detached from the body of the chip. Not sure how THAT happens. ???

    Anyway, I soldered a new one on and it works now.


    steve

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