Yes there is.
http://www.xbox-scen.../versions_3.php
The 1.5 was a limited creation. According to the link they only produced a few lines of the 1.5 then went back to the 1.4.
Taken from the link above
QUOTE
PC power/ground (v1.4 - v1.5)
There's no visual method to distinguish a v1.5 from a v1.4.
Xbox v1.5 has power and ground disconnected from LPC.
So you will have to measure if pin 2 (ground) on the LPC-bus is connected to the ground plane (a screw, for example) or not
*NOTE* Don't just assume you have a v1.5 because you have a new Xbox. There are very few v1.5 xboxes (we don't have exact data about this - but probably only produced on a few production lines in August 2003 (as testrun, production fault, ... we don't know). As far as we know MS produced the v1.4 again on all lines after that. Do the test above to make sure wich version you have. You most probably have a v1.4!
There is actually, apparently, a difference between the 1.4 and 1.5. The D0 pin on the top of the board on the 1.5 is filled in, and its open on the 1.4. The board design is identical, but you cant just slide in a solderless d0 connector on the 1.5 box due to the fact the hole is lacquered over. I found this out today when I couldn't figure out why my, what I thought was a 1.4 board, wasn't able to use the d0 non-solder setup. Then I went to Team-xecuters forums and found a picture of someone w/ a 1.5 and their board has the same covered up d0.
If you refer to the thread link below it'll show you a picture of a standard 1.2-1.5 box ... and then mine. Mine being the 1.5 you'll notice the D0 pin slot designated for the solderless mods is filled in.
http://forums.xbox-s...howtopic=510198
QUOTE(Alex548 @ May 4 2006, 02:00 PM)

1.5's don't exist.
That link to the xbox-scene thing you posted is very old and was posted because (at the time) people began reporting "new" 1.5 motherboards. Tons of stuff has happened since then and numerous long threads later... it's been determined that 1.5 motherboards NEVER existed.
Same thing with the 1.7 motherboards... they don't exist.
Did you happen to test the LPC with a multimeter before trying to install the solderless adapter? I bet you didn't bother to try that.
ive run intop several "1.4" motherboards with ground and 3.3v disconnected on the LPC (these were the "1.5s" i believe)
QUOTE
ive run intop several "1.4" motherboards with ground and 3.3v disconnected on the LPC (these were the "1.5s" i believe)
I have one in front of me now.
So surely they must exist.
QUOTE
... and if they did exist, they are supposed to be so rare that production was only a few weeks long.
Funny though... everyone and their grandma claims to have one of these "ultra rare" 1.5's.
IF 1.5's actually do exist, they're more rare than all the LE's currently available.
I've installed alot of chip's and this is the only one I have ever seen.
QUOTE
Many mod chip makers doubt even the existence of the 1.5, believing it to be a refurbished version of 1.4 motherboards with changes made to the LPC to prevent modding. This revision is exceedingly rare, if it exists at all.
Taken from here.
Also, quote from Appleguru:
QUOTE
While we're speaking of non-existant versions, there's no such thing as a 1.5 either wink.gif
So.. we have:
1.0, 1.1, 1.2, 1.3, 1.4, and 1.6/1.6b(same as 1.6 but with hynix ram)
Any and all "1.7s" are just 1.6s and any and all "1.5s" are just 1.4s.
with reply from Chancer:
QUOTE
appleguru is correct
Taken from this thread.
One last quote:
QUOTE
my xbox is version 1.8
do i need a modchip?
There is no way you have a v 1.8 XBox. They don't exist (yet...?). 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, and 1.6b are valid versions. (Technically there is no such thing as a 1.5 XBox: some websites such as XBox-Scene (http://www.xbox-scene.org) mention a 1.5 XBox, but it appears to basically be a 1.4).
Taken from xbox-linux website (google cached version): Click Me
QUOTE(digitard @ May 5 2006, 12:17 AM)

The board I have in that pic is untouched (unless you count the solderless adapter I put on yesterday). Its not refurb since I bought it new at Best Buy in September of 2004. It has never had a drop of solder on it as it was in the box untouched until I decided to put the modchip in. While I guess its possible I'm starting to lean on the idea that MS just decided to screw modding and filled in the holes w/ lacquer on my board and its just a 1.4 w/ filled holes...lol.
Ultimate question: is the ground of the LPC connected or not?
QUOTE(The Zep Man @ May 5 2006, 05:48 PM)

Ultimate question: is the ground of the LPC connected or not?
Bump.
Digitard, why don't you answer the question?