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iPhone 7 no service, one capacitor shorted

Hi guys, I have one iPhone 7 here. It has no service, no baseband firmware in settings. I know it could be the baseband chip or baseband power IC (BBPMU). I want to reball the BBPMU first. However, I found one capacitor next to the BBPMU is shorted (see attached picture, the one in the red circle). The problem is that the schematics I got here is different from the phone. The phone is an UK phone, the iPhone 7 schematic available online probably is for North America or Asia? The PCB layout of the UK iPhone 7 is different from the schematic, so I don’t know which line the shorted capacitor belongs to, and I don’t know what it is, because the capacitor is simply not there in the schematic.

Can anyone tell me which line it is please? And what’s its name? Many thanks.

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Welcome to my world…or maybe I am just joining yours ;>) Here in Canada we also have the Intel version of the iPhone 7. There is not a lot of troubleshooting info on this model although to be fair, the baseband subsystem seems to be more stable under the Intel chip-set.

You can find full schematics and board drawings in the FCL (WuXinJi) software. The capacitor you circled is C5704_RF and it is a 0.1MF/6.3V/X5R/01005. It is on the VDD_IO_1V2 line.

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I've seen a couple of useless reballing of the Intel Bb too..monkey see monkey do style repairs =:)

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Hi Minho, many thanks. You are always my great helper! :)

VDD_IO_1V2 line is not available in the schematic of Qualcomm version. Capacitor C5704_RF does exist in the schematic, however, it’s on a different line. The problem is that I don’t have FCL software. So I am stuck. :(

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The Intel board has totally different power rails for the baseband so no, you won't find it in the Qualcomm schematic. I now run both ZXW and FCL so that I always have a system running (ZXW used to have a lot of server issues) and they tend to complement each other. For $60, it's a worthwhile investment if you do a lot of board repair. I stil prefer running ZXW as it is faster and more efficient for daily use but there are somethings you just can't find on ZXW that are available on FCL.

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