you are wrong about reading a schematic for a different device...
all 9384 are the same (board No F9384-3)... and the letter after it is the Memory size and the options
all 93X4 have common PCB.....the 9374 have some unpopulated comps
just
And you, apparently, are wrong about your floating ground idea, because the very images you just posted show pins 10, 11, and 12 as being +3.3V.
E: That also makes it clearer that I was probably seeing one of the 5.2V supplies on the label. Ahh, blurry images. The pinout doesn't seem to match the PSU label, though.
about float:
the Front-End is working @12V,5V...the HADs are working @ 5V....the MDXs are Working @ 5V,3V..and the SRAMs are working @3V
the pins:
pin1,2,3 are as they apear on video L-to-R ,T-to-B....sorry about that i mean as in schematic
Pin 1 is the top left pin when looking down at the connector body from the wire side, with the locking tab to the bottom. Making it the BOTTOM pin facing you from the perspective Dave was working from. Pins 10, 11, and 12 are thus the top pins, facing you, yellow wires. +3.3V. Nothing you've said and nothing in the pictures you've posted supports this floating ground idea. There's a short on the +3.3V rail.
nope....
video ----- manual
pin1 pin12 OK
pin2 pin11 <_____| sorted
pin3 pin10 <_____| sorted
<Edit>
maybe i am misunderstood
SAM's pin11,pin10<------>GND 1 Ohm
SAM's pin11<---->pin10 uknown
SAM's pin12<---->pin11 uknown
SAM's pin12<---->pin10 uknown
DAVE's pin11,pin10<------>GND 0.1 Ohm
DAVE's pin11<---->pin10 uknown
DAVE's pin12<---->pin11 uknown
DAVE's pin12<---->pin10 uknown
<Edit>