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Insert and gently push the SIM card ejector tool (or an unfolded paperclip) into the small hole on the left side of the phone's top edge.
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Press gently to eject the SIM tray
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Remove the SIM card tray from the device.
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Insert a putty knife or opening tool into the seam between the phone's back cover and front cover.
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Run the opening tool along the seam to loosen the back cover.
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Open the back cover slightly so that you can see the flex cable connected between both halves of the phone.
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Disconnect the flex cable using the flat end of a spudger or a pair of tweezers.
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Remove the phone's back cover.
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Use a Phillips screwdriver to remove the five screws in the plastic covering at the bottom of the device.
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Insert the flat end of a spudger under the plastic assembly cover at the bottom of the device.
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Pry upwards with the spudger to lift the assembly cover.
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Remove the assembly cover.
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Use the flat end of a spudger to disconnect the battery flex cable from the lower assembly.
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Use the flat end of a spudger to disconnect the ribbon cable on the left-hand side of the device.
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Insert the flat end of a spudger under the assembly at the bottom of the device near the right-hand corner.
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Pry upwards with the spudger to release the right-hand corner of the assembly.
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Insert the flat end of a spudger under the assembly at the bottom of the device near the left-hand corner.
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Pry upwards with the spudger to release the left-hand corner of the assembly.
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Use your fingers to remove the assembly.
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Peel back the barcode sticker so that it is disconnected from the battery.
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Use your fingers to grasp the black battery adhesive tab and pull outwards firmly until the entire adhesive strip is released.
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Repeat for the second battery adhesive strip.
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Insert the flat end of a spudger underneath the battery.
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Use your fingers to remove the battery.
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crwdns2935201:0crwdne2935201:0 crwdns2935203:0crwdne2935203:0
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Use a spudger to disconnect all marked ribbon cables.
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crwdns2935201:0crwdne2935201:0 crwdns2935203:0crwdne2935203:0
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Use a Phillips #00 screwdriver to remove the eight screws fastening the motherboard to the phone's interior.
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Use a pair of tweezers to remove the small metal piece from the top of the motherboard.
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crwdns2935201:0crwdne2935201:0 crwdns2935203:0crwdne2935203:0
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Slide an opening tool underneath the plastic assembly covering the upper portion of the motherboard.
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Use your fingers or the opening tool to remove the plastic covering.
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Slide an opening tool or the flat end of a spudger underneath the motherboard.
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Pry upwards to loosen the motherboard from the phone's front cover.
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Gently lift the motherboard from its slot.
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Use the flat end of a spudger to disconnect the cable from the bottom of the motherboard.
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Use your fingers to remove the motherboard.
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Visually inspect the phone's motherboard for any corrosion.
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Apply a small amount of flux to the corroded parts of the motherboard using a brush.
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Wipe away any corrosion using a soft brush.
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Place a heat shield over the other parts of the motherboard to avoid overheating.
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Heat the affected area with a heat gun to reflow the solder.
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Apply a small amount of isopropyl alcohol to the affected areas.
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crwdns2935201:0crwdne2935201:0 crwdns2935203:0crwdne2935203:0
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Repeat steps 11-13 for any other areas of the motherboard that are corroded or rusty.
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