I’m not finding LMXS286268 as a valid model #, but I’d suspect this is either a LMXS28626S or LMXS28626D. In either case, if the fan motor has been replaced, the compressor is running and cooling, and you’re getting no voltage to the evaporator fan then the main control board will need to be replaced.
If you can double check the model # or just post a picture of the model/serial tag here I can get you the right control board for your model’s revision and product code.