If the current is high (more than 2mA) when shorting Data 6 to ground, while all
 other LCD pins are low, try to cut and isolate that Data 6 from LCD to board an
d repeat the current
measurement, now from the board to ground, and then from the LCD to ground... th
en you found it.

Wagner.

dave vanhorn wrote:
>
> >> There may be some hardware fault, but I'm trying to make sure that it OUGHT
> >> to work, before I start hacking up our one and only proto.
> >
> >Are you sure the LCD pin #1 (ground) has the same ground
> >from the processor?
>
> Yes, solid connection. I'm having trouble talking to other devices while
> the LCD is supposed to be sleeping.
> Data 6 seems to be pulling hard high from somewhere. Since the LCD works,
> it is my most likely culprit.
> This pin is "data" to three other devices, and I can't talk to them.
>
> >The pull up is around 60k Ohms, it draws 73uA to drop a data pin to around
> 0.5Vdc.
>
> One would think that a micro ought to be able to yank such a pin to ground
> :)  In fact the adjacent pin (data 7) is used in the same manner, as clock
> for the other devices, with no problem.