Before you begin Read this website's Legal Guidelines and make sure you understand the risks of this repair. Place your iPhone 3GS on a clean flat and soft surface, such as a rubber mat or a piece of soft cloth and get the required opening tools
		Follow the steps of the iPhone 3GS screen replacement guide until you removed the front panel.
		Step 2   Now remove the screws that hold the iPhone 3GS logic board in place.
		Step 3   Ease off the iphone 3GS dock connector ribbon cable (cable 4).
		Step 4   Carefully ease off the 3GS antenna connector cable.
		Step 5   This is what it looks like when the dock connector is disconnected from the logic board.
		Step 6   Also ease off the two connectors at the top left corner of the 3GS logic board.
		Step 10   After that you should be able to lift the 3GS motherboard out of the backplate.