Hi prem,
1. To stop the vibrator remove the jumper 2 (JMP2) in ASSY 700-20540 board
2. To test the camera ov2640 in imx31 ads board, make sure that the configuration of gpio levels (reset and power down are done properly).
(MX31_PIN_GPIO3_1 -LOW, MX31_PIN_GPIO3_0 -LOW).
Thanks and regards
Ananthapadmanaban