Microsoft Xbox Repair Manual page 15

XBOX VERSION DETECTION - (STEP1 IMAGE2)
LPC 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
Use a multimeter to check if pin2 (red point on images) is connected with ground (screw plate for
example). If you prefer you can also measure 3.3v (LPC pin 9) (Xbox must be ON) ... it's dead on
a v1.5.
*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 test run, 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
which version you have. You most probably have a v1.4!
Your LPC 3.3v/ground is connected: You have an Xbox v 1.4
Your LPC 3.3v/ground is disconnected: You have an Xbox v 1.5
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