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This TV has Operation Lock Out feature that can lock either control buttons on TV or remote control operation and it seems this feature is On in your new main board that should be turn Off to get the remote working.
Yes, typing info for you...
Turn On TV power buy hitting the INPUT and VOL- while plugging the TV in then push menu on control buttons on TV itself to get TV menu screen and go to System Option and find Operation Lock Out option, select it and turn it Off.
This change should work to get remote control operational.
OK, this is the only setting in TV menu that can stop remote operation.
If it is Off then I'm afraid this new main board is also faulty because there is no way around to navigate in service menu without remote to access reset option.
OK, let me repost this question for other experts to assist you further/ with different approach.