Motherboard downward vision sensors board

[The Ghost]

Does anyone know how to determine if the motherboard is good or bad on the mavic pro1? I have a water damaged mavic pro1 & was told motherboard needs replaced. I bought another supposed to be good motherboard & it still doesn’t work. I don’t know how to tell if the motherboard is good or bad. Anyone know a way to tell this. Thank you very much in advance. Thank you

 

[Maniac_au]

The easy way is if you have multiple units to swap out parts for testing, that way you can determine what parts are good.