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Last Post 11 Aug 2005 03:06 PM by  lallen@aamatrix.com
No LEDs when power connected
 2 Replies
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ev2@verafamily.net
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22 Oct 2003 01:31 PM
    I just started development with the LH75401-10 starter kit. I briefly got the board working and was able to run the sample application. I am now having a problem whereby the board does not seem to be powering up. When I connect power to it, none of the LEDs come on (I believe they came on before). I also do not see any activity through Tera Pro Term (I have not changed my seetings since it worked before). However, the LCD does come on when I connect the power.

    Any ideas as to what might be going on?

    Thank you.

    Epiphany
    Anonymous
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    22 Oct 2003 04:26 PM
    Hello Epiphany,

    Yes, the LED's should be flashing back and forth.

    Please verify the following:
    - Has the bootloader been overwritten? Did you write an application to reside in block 0 of flash?
    - J6 JTAG jumpers are in the correct position
    - the card engine is being supplied with 5 volts
    - the card engine is seated correctly. (remove and reinsert card engine, view from side to verify the expansion connectors on the backside of the card engine are correctly mating to the application board.
    - The regulators are supplying the correct voltage and are not burned out.

    Please get back to me with the information.

    Best Regards,
    Andrew Wawra
    Tech Support
    Logic Product Development
    lallen@aamatrix.com
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    11 Aug 2005 03:06 PM
    I know this question was answered long ago, but I thought I'd add my 2 cents in case anyone else searched for this problem.

    I had the same issue today and I too was a bit concerned. Solution:

    The processor card was loose from the base unit. This causes the LCD to power up, JTAG functions to work, but no lights and no serial comms.

    I think I'm going to bolt the two together with some small bolts and spacers as the processor card is not well supported on the far end.

    No smoke was let out though.

    Forums NXP SOMs and Development Kits LH75401 Card Engine and Development Kit
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