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2014年9月19日に発売されたiPhone 6の修理情報とガイドです。モデル番号 A1549、A1586、A1589。

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PMIC issue on iPhone 6

Hye I got an IPhone 6 sent in to me regarding VCC_Main Short. No water damaged attempted on this IPhone. After removing the PMIC I got no shorted to ground on VCC_Main. But the problem is, I screw up the two pads D21 & C21. According to ZXW Tools it showing 45_Buck5_FB (C21) & BUTTON_TO_AP_MENU_KEYL (D21) . I dont know what those line do.

So my question is, is it okay if I just solder the PMIC without making a jumper on the pads that I mentioned above ??

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45_Buck5_FB - This is a feedback line that tells the PMIC that Buck5 (Buck Regulator #5) is producing the proper voltage. Buck 5 produces P0V95_FIXED_SOC which is a 0.95V fixed supply line for the System on Chip (the CPU/GPU).

BUTTON_TO_AP_MENU_KEY_L - This means (Home) Button to Application Processor, Menu Key Active Low

In my opinion, both of these lines are important and you will have to jumper them to insure proper functioning of the Home Button and regulation of P0V95_FIXED_SOC.

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A vccmain short is never going to be due to the PMIC in an iPhone 6 with no water damage. Taking off the PMIC is a really aggressive thing to do in an iPhone 6—it is not a failure point unless water went under it. Just want to make that clear for anyone reading this post in the future.

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But why the short is gone after removing the PMIC ? I taking off the PMIC because the heat was around the PMIC area. But before taking off the PMIC, I remove all the VCC cap around the PMIC to make sure there is no short besides the PMIC

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Your short is gone either because 1.) You never had a vccmain short and were misinterpreting something else as a vccmain short, 2.) You have disconnected the vccmain section where a short is from the place you are measuring by removing the pmic. or 3.) You had the first iphone6 out of thousands to have a sudden onset pmic short within the pmic and it is a historical case.

I'm pointing this out because "the internet" believes that iPhone 6 pmic just goes bad, but that has never been my experience and I have probably fixed more sudden death iPhone 6 than anyone. I have never seen an iPhone 6 sudden death PMIC failure. While it is possible, it would be unheard of, and I don't think that you ruled out the conventional causes of vccmain short on iPhone 6.

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Azim WHITE さん、ありがとうございました！
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