The power cord that comes already attached to my Hisense Roku H4 Series Smart TV is too short. Do you know if there's an extender or if it can be replaced with a longer one?
You can use an exertion cord in this situation to plug the TV in an electrical outlet.
Something like this:
I have 3 Roku TVs and not a single one has grounded plug.
Generally, I plug the TV into a surge protector then plug the surge protector in the wall outlet. 6 foot long surge protectors have worked well for me in my situations with my other TVS.