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Repair information and guides for the iPhone 6 that was released on September 19, 2014. Model Numbers: A1549, A1586, and A1589

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iPhone 6 no power after drop

Hi,

I have a iPhone 6 that won't power on after a drop.

I opened it up, had no VCC_MAIN short, but had a PP3V0_NAND short, found the capacitor that was causing it and now when I plug in the DCPS instead the battery I get a draw of 0.010A before prompt to boot, after prompt it draws around 0.150A for a second, then goes to 0.010, and then loops the whole time. I can't find any shorts or bad data lines. The PP1V8_ALWAYS is stable, but all other voltages (PP3V0_TRISTAR, 1V8_SDRAM, 3V0_NAND...) come and go the same as the power supply is showing, ON for a second, then OFF and repeat. The computer doesn't recognize the phone and can't get to DFU or recovery. When I leave the phone running like that the PMIC and CPU are get warm but nothing crazy hot. I am lost on this one, any ideas?

Thanks

Answered! View the answer I have this problem too

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Hi Tomas. I would check the following:

  • Verify the resistor on the 45_LCM_REXT line to insure it meets specifications. This resistor is responsible for properly biasing the MIPI/DSI interface circuit.
  • Verify that R0206 is within specifications and that C0201 is not shorted. R0206 pulls up the RESET_1V8_L line to 1.8V.
  • Verify the internal continuity of the RESET_1V8_L line 1.8V line by testing between TP2508 and pin C2 of Chestnut. This will require that you remove U1501. If this line is broken, then you will need to run a jumper.

Also, rather then re-create the whole answer, I encourage you to read through the question, answer and comments on this question, you may get some good ideas (Water Damaged not booting tried lots looping with 70mA draw).

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Hi, sorry for the late response, I measured everything you said, all is within spec and diode mode readings normal, I did check out the other thread you linked, tried it all, nothing helped. Any more ideas or simply no fix?

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These problems are frustrating to fix because so many things could be at cause. I would check all of the reset lines feeding into and out of the PMIC, check all of the I2C line pairs, check all PMIC and BBPMU voltages etc. This is not the type of issue that has a plz bro solution...you will have to dig.

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