rpcrev, over the last few years I received more display assemblies with non-working digitizers. There is really no good way to know ahead of time if it will, or will not, work. Unless of course you have a dedicated test phone that you know to be in good working condition and you could try it out. Personally I would contact the vendor and try a replacement first. There is always a possibility that there is damaged to the touch IC, but it is slim. There are some test points on your logic board that you can check if they have the proper voltage:
TP1=3.3v
TP2=1.8V
TP3=1.8V
TP4:1.8V
If those are within that range you are okay with your board. The touch control signals are generated by the MSM8974.
Hope this helps, good luck.
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