Onida / Mirc Electronics — onida tv - xaria lite - remote sensor is not functioning - key lock

I bought a onida tv [model: xaria lite] on 25/08/2009 from m/s sree arrasu tv centre & hom e appliances, tirupattur - 635601. Since last 5 years a problem persists in my above referred tv which was reported to my supplier. The service engineers, who visited my home several times could not find a proper solution for the problem.

Problem:- the remote sensor in the tv is not responding. Hence, the required functions were done manually. But, since the recent past, the manual function also could not be done, as there is a key lock.

Hence, i request to do the needful to clear the above referred problem at the earliest.