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Use this guide to replace the motherboard.
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Insert a plastic opening tool or fingernail into the notch in the gap between the rear case and the rest of the phone, located at the top of the device.
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Gently twist the opening tool to disconnect the clips securing the top of the rear case.
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Slide the plastic opening tool left along the top edge and repeat the twisting motion to widen the gap between the rear case and the phone.
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Continue to move the plastic opening tool around the perimeter of the top left corner, gently prying up along the rear case.
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Pry along the top right side, and continue prying down the right side of the rear case.
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Lift up and remove the rear case from the phone.
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Wedge a plastic opening tool into the small notch above the battery.
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Pry the battery up out of its recess.
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Using your fingernail, push the SIM card slightly deeper into its slot, until you hear a click.
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After the click, release the card and it will pop out of its slot.
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Use your thumb to slide enough of the SIM card out of its slot to grab ahold of it.
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Grasp and remove the SIM card away from the phone.
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Using your fingernail, push the microSD card slightly deeper into its slot, until you hear a click.
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After the click, release the card and it will pop out of its slot.
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Use your thumb to slide the microSD card out of the slot.
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Remove the microSD card from the phone.
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Remove the ten 4.0 mm Phillips screws securing the midframe to the front panel assembly.
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Grasp the left side of the plastic midframe with your thumb and forefinger and lift it away from the phone.
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Use a plastic opening tool to pry the rear-facing camera connector up from its socket on the motherboard.
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Insert a plastic opening tool outboard of the speaker portion of the headphone jack/speaker assembly.
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Gently pry the headphone jack/speaker assembly up from the front assembly.
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Lift the headphone jack/speaker assembly out of the Galaxy S III.
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Use a plastic opening tool to pry the front-facing camera connector from its socket on the motherboard.
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Disconnect the digitizer cable by gently prying its connector up from its socket on the motherboard.
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Disconnect the display data cable from the motherboard.
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Pry the Wi-Fi antenna cable connector up from its socket on the motherboard.
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Gently move the cable out of the way of the motherboard.
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Remove the single 3.0 mm Phillips screw securing the motherboard to the front panel assembly.
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Carefully lift the bottom of the motherboard assembly away from the front panel assembly.
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Remove the motherboard assembly from the front panel assembly, minding any cables that may snag on it.
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Use a plastic opening tool to pry the rear-facing camera connector from its socket.
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Remove the rear-facing camera off the motherboard.
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The motherboard remains.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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Between step 13 and 14, there should be a step to detach the cable to the camera lens and speaker assembly and the removal of the assembly.
The are usually $100 and Galaxy S III (Verizon) Motherboard
Where do i buy the original motherboard and what is the cost
I have a motherboard of samsung galaxy s3 sgh-t999 t mobile pm me here's my email tan.jeffrey84@yahoo.com for more info
Cheapest place to buy them is ebay.
