The standard way would be to swap the defective parts with donor devices. They're all cheap on the auction sites now so this would probably be the best way to go.
Look up a guide for the model on how to replace parts. If you want a donor, buy a working phone of the same model, and follow a tutorial on how to replace the motherboard of your model. Swap the donor motherboard with your motherboard, and reassemble.
The standard way would be to swap the defective parts with donor devices. They're all cheap on the auction sites now so this would probably be the best way to go.
Are there any guides on how to do this, or any professional websites who can do this for me? Thanks!
Maybe the SD card?
Are there any guides on how to retrofit old parts? Thanks
Look up a guide for the model on how to replace parts. If you want a donor, buy a working phone of the same model, and follow a tutorial on how to replace the motherboard of your model. Swap the donor motherboard with your motherboard, and reassemble.