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Sixth iteration of Apple iPhone, announced on September 12, 2012. Repair of this device is similar to the previous models, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Black or White.

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How do I identify my iPhone 5 short?

So I have an iPhone 5 that was brought to me by a customer as a water damage repair. It was actually still turning on when he brought it in. I am not the store owner, but I am a technician who would like to be able to take my repairs to the next level. We have only recently started desoldering the shields on the iphone 5, so obviously we weren't doing everything we could on the water damage side.

However, after we desoldered the shields and ran it through our ultrasonic machine (doesn't have sweep frequency) it would no longer power on at all.

I noticed that there was a something on the board that was getting extremely hot. However, I know very little about circuits. I don't know how to identify capacitors, resistors, or any of the other common parts found on a board. I don't know the properties of said parts, and I don't know what anything does.

However, doing the actual physical act of soldering isn't too difficult for me. My problem is finding what needs to be fixed and what is possible to be fixed.

Having said all that, what I found to be very hot to the touch, to the point where it would burn me was labelled L15 on the board view. It is right next to the U7 chip.

Here is a picture:

Its the thing with a little white dot over the thing with the "L" on it.

I actually removed it from a donor board and tried to replace it on the new board. However, the phone still doesn't turn on and the chip is still getting extremely hot.

Is there any advice as to what can be done?

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1 Answer

Chosen Solution

Aaron the part (L15) is a 2.2UH 20% 1.57A 0.172OHM power inductor. If it heats up you have a short circuit. The signal for the inductor comes directly from U7 which is a power management IC to the SDRAM. So that is where your short may be situated. You should get 1.8V past the inductor.

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Thanks so much for the reply! I've never really posted on ifixit because I didn't really expect any advice to be here. I found this video by deep fix.

If I am not getting the proper measurements, do you think replacing my U7 would be the next step?

I also found Jessa Jones' video because her videos are awesome, so hopefully ill get insight from that too! Though that is an ipad u2 charging chip.


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Aaron will be eternally grateful.
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