Answers
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Answer to: Camera stops working after repair
Try cleaning the connection with Windex. Make sure it is completely dry when you reassemble and power on. -
Answer to: How do I fix the software on my iPhone 3G?
Do you mean your iOS? Connect to iTunes and do a restore. Make sure you back up and sync all your data first. -
Answer to: Black screen only after front panel replaced
Double check all your connections. -
Answer to: Home button and charger not working after fall.
Dock connector for sure. The home button plugs into the dock connector. That would explain why both the home button and the charging isn't working. I've replaced my dock connector on my iPhone 4 and it now works great.
Notes
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Installing iPhone 4 Home Button
Used this guide to replace a home button on my iPhone 4 which stopped working after the iPhone was out in the rain for 30 minutes. Worked like a charm. It was very hard but I took my time. Unfortunately, it didn't fix my problem. Upon further research, the dock connector was the culprit. It is where the home button plugs into. Replaced that using a guide here and now everything works great. So if your home button doesn't work after replacing the physical button, try replacing the dock connector.
Answer to: What is this part and where does it go?