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problem 1: need to replace my broken one inside the camera Problem 2: camera repair centers say authorized Sony repair centers wont accept used parts, such as the used main board I have to put in the camera what do you think? Do I absolutely need to buy a new part?

Evan Girard no you do not. Used parts are okay to install, just not through an authorized service centers. They do not accept your used parts because they could not guarantee their repair and would not make any money of you. You can most certainly install most parts yourself.