Same specs or same model? Same specs you are out of luck but the same model should work
I am not a TV technician but if you are not familiar with electronics gets a friend or someone to help.
Capacitors can hold a fair bit of charge even after being off for a while. Hiring a professional is probably not worth it, depending on the age and model
https://www.nvidia.com/download/index.aspx
Just select your model from the list under 700 series