It's surprisingly similar to the one I had to pinout by hand years ago:

http://www.ubasics.com/adam/electronics/lcd/pinout.shtml

It's easy enough to find the ground lines, and the VCC shouldn't be
difficult.  Beyond that, it's hard to damage them, so try a few things
out.

-Adam

On Wed, Mar 23, 2011 at 9:35 AM, PICdude <picdude3@narwani.org> wrote:
> Hi all,
>
> Tinkering with a 40x4 LCD. =A0Haven't found a full datasheet yet, but
> this is the physical data...
> http://www.winstar.com.tw/products_detail_ov.php?lang=3Den&ProID=3D41
>
> With the two enable pins and the repeated addressing of the character
> positions, I suspect it's just laid out two 40x2 LCDs in one. =A0And I'm
> fairly sure I've heard this before somewhere.
>
> However, I have doubts on the pinout. =A0The pins are labeled in reverse
> order (compared to the 16x2, 20x2), but comparing pin positions,
> almost all lines (DB0-7, R/W, Rs, Vo) are in the same position, but
> the Vdd & Gnd lines are reversed. =A0Is this correct? =A0Or could it be a
> datasheet error? =A0I want to be sure before I fry this thing.
>
> Cheers,
> -Neil.
>
>
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