Overheating NAND in iPhone 7

Question

iPhone 7

Veröffentlicht am 16. September 2016. Modelbezeichnung 1660, 1778. Verfügbar in den Versionen: GSM oder CDMA / 32, 128 oder 256GB / Rosé Gold, Gold, Silber, Mattschwarz oder Hochglanz-Schwarz

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Sarah Wreisner @insquirrel

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Veröffentlicht: 12. Nov 2020

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Overheating NAND in iPhone 7

I have an iPhone 7 which came to me looking like it was thrown against a brick wall but the board looked good. Power is coming in fine, but amperage is constantly rising to 480 milliamps and dropping, over and over. With freeze spray, I found that it's heating REALLY rapidly under the CPU where pins c65/c66/d66 are (pp1v8_sdram and pp1v1_sdram). Can someone throw me a bone? I've checked for shorts at every point that these pins are related to. Can someone help me get on track?

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Gewählte Lösung

Chris Stables @imicrosoldering

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Veröffentlicht: 12. Nov 2020

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You need to determine if it is a power issue or a data issue. A close visual exam is also extremely important. You said it looked like it had been thrown against a wall.

· The .48A is coming from your DCPS and not an amp meter?

· Check all NAND power rails are producing the correct voltage.

· Check all coils around CPU for cracks as this happens on the 7 series.

· Try putting it in DFU mode.

· Put some pressure on the CPU and prompt to boot.

These can turn into time consuming repairs but as I said you first need to determine if it is a data problem or power problem.

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