Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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No backlight after water damage

Hi, i have an iphone 3gs which has water damage. All seems to be working ok but the screen is dark. If i shine a torch i can see the images.

I have swapped the LCD but still dark. The 6r8 chip seems to look ok (not blackened)

There is some green corrosion around connector 1 and 3 and in a few places on the underside of the logic board.

I am awaiting some isopropyl alcohol 99% to be delivered. If i thoroughly clean the logic board and remove all corrosion, should all be well with the backlight?

Thank you

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Chosen Solution

Marc, possibly that things are going to be okay. Definitely treat the phone the same way as a water damaged phone. Clean it using this guide. It was written for a 3G but most certainly still applies. Re-evaluate after you clean the phone. If your backlight should still not work, test the 6R8 coil. Use this video or this one and see if it is time to change that coil. Now, if a coil replacement does not resolve your issue, there is still the possibility that it is your backlight IC 109B that is giving you the trouble. That will be harder to replace and will require special tools and techniques. I hope this helps to shed some light on your issue, good luck

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