No. It could not be the reason. The parts might be of Sonys'; but the circuit will be of Technicas'. Its main system control IC should be concerned; not other parts. If you feel any difficulty in using the remote control, it might be of any other cause.
Check the remote control for its infra-red emission. Check it with fresh batteries. Check by pressing all the buttons on it; and see whether all of it generates infrared signal while pressing. If it is found OK, check and replace the infrared sensor inside the TV. If you wish to get some details; check the site linked here. It has details about how to check a remote control; by one among the post. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
If the remote control is found OK; check and replace the infra-red sensor inside the TV. Contact any service technician.