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Repair information and guides for the fifth generation of iPhone. Model: A1387

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iPhone 4s water damaged

I just received the iPhone 4s, and it's water damaged.after I take off the back cover of the phone. I saw the phone of the logic board looks allright. Then I take of the ic shield in the logic board and put in the alcohol for the clean. Even clean all the cable connector.then dry it and put back.when I put all parts back I replace the battery and screen panel. Then I push the power button try to turn on the phone, it start the apple's logo, and then turn to the black, and it's not the all dark, just a little bit light , and under the light, I still can see show me need input password. In this time I check screen shoot function still work, and I still can turn off the mobile. Then I put on the cable try to connect to the iTunes , bit iTunes can not recognizing the mobile. What's the problem of the phone, is it the problems with logic board? Thanks a lots

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Lemon, "not the all dark, just a little bit light , and under the light" sounds like you have a bad backlight circuitry, or the coil/IC on the logic board are short circuited. Since you already replaced the battery and the display assembly, you may have to replace the coil and/or IC on the logic board. This will require some good soldering skills as well as tools. Hope this helps, good luck.

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The components are as follows:

Reference Designator L18 4.7UH-1.2A-406MOHM VLS252012-SM which is a inductor and it is available at Mouser.com

Reference Designator is D1 PMEG3005EL which is a very low VF MEGA Schottky barrier rectifier Diode. It is available at Digikey.com

Both components are of course SMD components and as such would require some great skills and good tools to be soldered. I would use a hot air rework station and a good magnifying source.

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Any more hints for the soldering replace the two gadgets.or just something more about that's two gadgets. Very appreciated.

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Any suggestion to do this job, if I can keep the phone for longer, probably I will try to replace the two small gadget.

And I'm just worry about any more problems on the logic board.becase when I connect to the iTunes , the iTunes can't recognize the mobile.

Thanks a lots

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the backlight circuit is unrelated to the usb detection circuit

so yes, two problems--at least ;)

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