Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White.

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How to fix a dark screen

Hello,

My phone got wet, after drying it with rice and using a tooth brush with an alcohol solution, I replaced my screen and my battery. The phone is fully functional (including the touch) except there is no light on the screen which is completely black. Any advice?

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Amit, rice is great for Gallo pinto :-), but it will not fix your phone. Rice does not prevent corrosion, it is the equivalent of doing nothing. The very first thing to do is to disassemble your phone. Use this guide. Once you have it disassembled clean it with +90% isopropyl alcohol. Do not substitute this with other cleaners :-) Use this guide to see how to clean the phone. It was written for a 3G but all the steps are pertinent to your phone as well. Check for any missing or charred looking components. Once you have it cleaned, replace the battery and reassemble your phone. Reevaluate for any damage.There is really no a surefire way to say which part is the one that gives you the problem. I would recommend that you start it systematically. Make sure that your replacement screen really works. If it does, take a close look at the backlight IC and coil on the logic board. That repair is a bit more difficult due to the fact that those are SMD components. Water damage is the hardest to diagnose and to repair since you never know exactly which part has failed. Even if you do everything right, there is still a good chance that your phone will never be the same. Hope this helps, good luck.

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iPhone 4 Logic Board Image

Guide

iPhone 4 Logic Board Replacement

Difficulty: Difficult30 minutes - 2 hours

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Guide

Repairing iPhone Liquid Damage

Difficulty: Difficult1 - 2 hours

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The screen is new and working with another phone and the battery is also new. I also cleaned the corusion which leads me to believe it's the coil, backlight IC or both. Thank you very much for helping me figure this out but I'm afraud this is out of my league. How much would you expect this would cost if I will go to a shop to get it done?

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You're from the USA? I found this offer on eBay: http://www.ebay.com/itm/iPhone-4-iPhone-...

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UK, I am sending my phone to a similar place here, thanks.

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Hey, you cleaned the hole logicboard with >90% Isopropanol? I'm not sure but I think there is a chip on the logicboard, which controls the backlight. If you have bad luck, the chip is faulty.

You bought a new screen, can you verify that the screen is really working? Maybe you got an faulty screen.

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Amit will be eternally grateful.
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