WHERE CAN I GET USER MANUAL FOR JVC PD-43N910 SMART 3D PLASMA TV

Did you check with the manufacturer on their web site? If not available it is because the set was a special model for a large store - they change the model numbers on those sets so they cannot be shopped. You need to find the equivalent JVC model which asise from a different model number is identical.

They do NOT make special models for these big retailers - just give them a special number.