Replacing the Logic Board, what about installing iOS?

Connect your phone to your computer, you want to rule out charging cable, charge port, battery. if your computer does not recognize the phone being plugged in there is a disconnect somewhere. try the easy stuff first otherwise may need further diagnostic.

Hi

1.How can I make sure that the logic board working or not?

Ans.Try to restore with itunes if its completed then ur board dont hv any issues

2.If I change the logic board (that includes the processor and the storage unit) does the new logic board came with the iOS or I need to reload it somehow?

Ans. No were u ll get New logic boards either it may be replaced with other devices

Hope It Works

Thanks

Varun