No audio? Replace the headphone jack!
Tools used in this guide
Phillips #00 Screwdriver
Small suction cup
Parts relevant to this guide
iPhone 3G Headphone Jack Assembly
Step 1 — Battery
The display assembly is still connected to the iPhone by several cables, so don't try to remove it entirely just yet.
Rotate the display assembly up until it is at an angle of approximately 45 degrees.
Continue to hold the display assembly with one hand, and use your other hand and a spudger to disconnect the black ribbon cable labeled "1."
Rotate the display assembly up until it is roughly vertical. This will allow easier access for disconnecting the remaining cables.
Use a spudger to disconnect the black ribbon cable labeled "2."
Some iPhone 3Gs may have the connector colors reversed (black plastic tab, white connector). Make sure you're flipping up the tab properly, otherwise you may damage the connector.
Use a spudger to flip up the white plastic tab holding the remaining ribbon cable in place. The white tab will rotate up 90 degrees, releasing the ribbon cable.
Slide the black ribbon cable out of its connector, and remove the display assembly from the iPhone.
Insert your SIM eject tool or a paper clip into the hole next to the headphone jack.
Press down on the tool until the SIM card tray pops out.
Grasp the SIM card tray and slide it out of the iPhone.
Use a spudger to disconnect the ribbon cable labeled "4."
Use a spudger to disconnect the ribbon cable labeled "5."
Use a spudger to disconnect the ribbon cable labeled "6."
Carefully peel up the small sticker labeled "Do not remove."
Remove the following 8 screws:
Five 2.3 mm Phillips #00 screws with partial threads securing the logic board to the rear panel.
Two 2.3 mm Phillips #00 screws with full threads securing the logic board and camera.
One 2.9 mm Phillips #00 screw from beneath the "Do not remove" sticker.
Use a spudger to gently pry the camera up and out of its housing in the rear panel. The camera cannot be removed entirely yet because it's connected to the bottom of the logic board.
Use a spudger to gently pry up the end of the logic board closest to the dock connector.
If the board won't lift up, double check to make sure all the screws securing the logic board have been removed.
Slide the logic board towards the dock connector and out of the iPhone.
Use a spudger to pry the battery up from the rear panel. The battery is attached with an adhesive strip around the perimeter of the battery. To prevent the battery from bending during the removal process, we recommend against using just the plastic pull-tab .
Remove the two Phillips #00 screws securing the on/off switch to the front bezel.
Carefully peel up the orange ribbon cable from the rear panel.
Remove the following 4 screws:
Three 1.8 mm Phillips #00 screws securing the headphone jack and GPS antenna to the rear panel.
One 3.8 mm Phillips #00 screw in the plastic loop near the headphone jack.
Remove the four Phillips #00 screws securing the volume and vibrate buttons.
Lift the volume button circuitry away from the side of the iPhone, and carefully peel up the orange ribbon cable from the rear panel.
Carefully lift the headphone jack assembly out of the iPhone.