Help about identifying a component, urgent.

Dear all,

Hi guys! I lent my A2179 to my friend and it stopped working he said. I took it back and find it out one smc dropped from the board. I don't know how he managed that. Can you help me where can I find that component? Board number is: 820-01958. I am waiting your urgent assistance. I couldn’t identify from schematics (I am noob :( ). Pictures are here:

Thanks from now!