Just to make sure... looking at the back of the connector where the solder pads are, it's numbered like this, right?
back of x50v
______----________________________----______
| 1 17 19 35|
| _-_-_-_-_-_-_-_-_- _-_-_-_-_-_-_-_-_- |
| 2 18 20 36 |
-------------------_____--------------------
front of x50v |