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Released September 16, 2016. Model 1660, 1778 Available as GSM or CDMA / 32, 128 or 256 GB / Rose gold, gold, silver, black, and jet black.

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iPhone 7 bootloops when Audio IC is in

Hi, I got some “dead” motherboards to repair and I have problem with this one. It is A1778 model. It was missing some chips (BB PWR, Tristar and Audio IC), so I replaced them.

Without audio IC it was working fine, got signal and everything, but when I put audio IC back the phone starts bootlooping. I have done jumper wires, tried another chip, but it is always the same. Any ideas where might be a problem?

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1 Answer

Have you ruled out parts? Installing the audio IC can bring into play the front camera flex assembly, faulty battery and dock connector. If you are sure it is not a parts issue you can continue diagnosing the board.

·         Have you tried a different batch of audio IC’s?

·         Are you re-balling them?

·         You need to diode the pads under the IC and compare with a working board.

·         Have you checked all the resistors under the edge of the shield? They can occasionally get nudged.

·         The most important one is have you jumped D12 to G12 and tested?

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