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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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How to test a water damaged 6S - test points

So I have a 6S which has been totally submerged In water and unfortunately the person did try to turn the phone back on, and did not do anything special to try to get the moisture out. I have looked at all, or at least in all the places which I could access with a microscope and no components seems to have any obvious damage to me, except maybe U5411_RF and / or C5403_RF, but thats a maybe ?

I have cleaned the motherboard in alcohol.

Anyway, the phone does not boot up and does not respond at all when powering the phone from either a battery or with a charger.

So where could I start measuring, at which components and places would be suitable to start testing?

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Firstly I would check for a vcc main short. It most likely will have one. How you track it down depends on what tools you have. Freeze spray, flir cam or the old fashioned way with your tongue.

Update (05/16/2019)

C4127 would be the best to check vcc main.

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Thanks for your answer. Can't I measure with a multimeter? Which components do you recommend to check first if I want to check for a VCC main short?

I am not skilled in this particular area, only a little bit in electronics in general, but I would like to give it a try anyway, thats my only option at this point.

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Jon Smith will be eternally grateful.
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