Dout troubles

[jeroddumas]

Just connected up a Dout module.  When I turn on my MB i get all LED's lit.  I know this is not correct.  What could be causing this problem??

[TK.]

- short circuits

- swapped control lines

- unconnected control lines

- swapped LED polarity

- application switches on all LEDs

- or all the other errors which have been made by people in the past (just use the search function of this forum)

Best Regards, Thorsten.