These cleaning suggestions may not restore your phone to working order, but once you have eliminated any liquid & cleaned away any corrosion / debris you may be able to determine if any parts need to be replaced.
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Electronics Water Damage
Step 1 — Assessing visible external damage
- Look for liquid / residue between the touchscreen & LCD. This phone shows water build-up between the touchscreen & LCD & most likely contains more liquid inside.
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In this case, there is no obvious damage / corrosion in the external dock connector.
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There is no obvious damage / corrosion in the headphone jack.
Step 2 — Disassembly
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Lifting the front panel of this phone, the flex for the dock connector has stuck to the back of the mid frame.
Step 3 — Assessing visible internal damage
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The water damage sticker is now pink, indicating that the inside of this phone was flooded with liquid.
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Residue and corrosion discoloration can clearly be seen on the connectors for the LCD, Digitizer & proximity sensor, as well as the camera and SIM card slot.
Step 4
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The dock connector water sensor sticker has turned pink too, indicating liquid flooding of this end of the phone.
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The top of this dock connector looks fairly clean, with only a few green corrosive changes near connector 4.
Step 5
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The rear of the display assembly shows more green corrosion and debris on the LCD and digitizer connectors.
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Removing the LCD and the back cover of the ear speaker & proximity sensor assembly reveals liquid damage to the speaker.
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The proximity sensor is only lightly damaged.
Step 6
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Closer inspection of proximity sensor/earpiece flex reveals more corrosion damage.
Step 7
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After removing the logic board more liquid damage is visible.
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The vibration motor has some rust.
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The battery pins have corroded.
Step 8
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Headphone jack connector 5, the vibration motor & the volume switch show some light corrosion.
Step 9
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Rear of motherboard showing some signs of corrosion to battery contacts.
Step 10 — Removing the logic board shield cover
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Look for the dimpled tabs on the shield that reach down over the tabs attached to the mother board.
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Using your plastic tool, catch the edge of a dimpled tab near a corner of the shield & pry it up away from the logic board.
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Being careful of all the tiny surface mounted components, work your way around the available edges until the shield comes free.
Step 11 — Cleaning the logic board
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Submerge the logic board in isopropyl alcohol & allow it to soak long enough to loosen hardened residue & to displace any remaining water / other liquid. Use a soft brush to remove visible corrosion & residue.
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Residue from motherboard left in isopropyl alcohol container.
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Clean all flex ends, battery contacts, connectors, chips & fuses on motherboard with a soft brush.
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Repeat cleaning if necessary / if traces of residue are still visible.
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Allow the logic board / other parts to dry completely before reassembly.