But in our experience the logic board is fairly hardy and replacing the battery normally sorts things out. The iPhone 3GS pictured above obviously needed a new iPhone 3GS rear case. But to my surprise with a new battery and a new rear case it working like a dream.
You do have to be a little more careful when doing the battery replacement yourself when the battery is swollen. This is because:
- There is a build up of pressure. So when undoing screw and clips there is an increased possibility of screws or components flying out. I would recommend some sort of eye protection.
- Due to the logic board often being warped it this situation, it often makes it a lot more difficult to get it out and even more so getting back in. The screw holes can be difficult to line back up for the same reason.
- There is always a risk when working on electrical devices as so many things can go wrong. If you are in any doubt it probably best to get a professional to do it.
For a guide on changing the battery in an iPhone 3GS please read our post on the subject.