How to Replace Samsung Galaxy S3 Return Menu Button Flex Cable
This is by no means a easy job if done right. It would mean you would have to remove the LCD, so this easy fix bypasses having to remove the LCD, on the other hand it does mean making a hole in the plastic frame, this will not be seen and I think is worth doing to save time and money and also possible damage to LCD.
Warning: if you follow this repair guide, I Britec take no responsibility if you damage your mobile phone.