Just check which pin (on the sub-D15 connector) goes to which solderpoint on the board. Write it down. Then check which wirecolor represents a pin on the new cable. Just double check to be sure and if your handy with soldering, it would be an easy job and saves you allot of money.
If its hald wired I'd say your hosed. I would not attempt to repair monitors. If you need to salvage the monitor, then have a pro do it. (Unless you are a pro)