Lenovo s850 accelerometer calibration error

Hi.!
Recently I have buyed lenovo s850 it is working good, but a few day ago there is a problem when I opened camera my phone is directly going into landscape mode even when I hold it in portrait and I showed it in lenovo servicing centre also they checked but said nothing is wrong, they even flashed new firmware but no change finally they said it is an mother board problem, they said that it will take 12 to 15 days to change the mother board from factory, but I didn't like that and I brought my mobile to my house and tried to caliberate my g.sensor it worked some good but it is not staying for a long, I have downloaded accelerometer test apk, it is saying that caliberating (10.2px) when ever this process takes place my sensor works nice but after that it will retrack back, so sir is there any solutions so that I can correct my calibration error values. Thank you

How to completely disable accelerometer and gyroscope on lolipop

Hello,
recentrly i got my hands on an galaxy s4 that has been smasched to a wall.The accelerometer and gyroscope have been damaged and interfere a lot with phones behavour.Phones run 5.0.1 and has root privilages.I also have root explorer.I assume that disabling completely these features can be done by deleting some system files.
Also i have tryied everything else,calibrations,updates etc and i am 100% sure that these sensors are damaged(also selftests dont pass)
Can you please tell what i must do in order to completely disable these two sensosrs from the device so that it can get in good working condition again.
Thanks.