Overheating NAND in iPhone 7

Question

iPhone 7

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.

2092 Questions View all

Sarah Wreisner @insquirrel

Rep: 89

5

3

1

Posted: Nov 12, 2020

Options

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?

Answered! View the answer I have this problem too

Is this a good question?

Yes No

Score 1

Add a comment

2 Answers

Chosen Solution

Chris Stables @imicrosoldering

Rep: 50.9k

8

16

101

Posted: Nov 12, 2020

Options

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.

Was this answer helpful?

Yes No

Score 2

Add a comment