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현재 버전 게시자: Karolis ,

제목:

Having hard time locating short on PP3V0_NAND

텍스트:

Hi guys,

I have an iPhone 6 was not turning on. After connecting to DCPS I noticed that PMIC heats up. I confirmed that PP3V0_NAND is shorted to ground and using alcohol method I confirmed that PMIC heats up first in that circuit. I removed PMIC expecting that I removed short to ground on PP3V0_NAND but it remained. When I inject voltage up to 3V none of the components heat up but my DCPS showscurrent consumptions. What is going on?

There are not many components on that line but visually they all seem to be OK and none of them produce heat.

My wild guess would be that via within PCB on that line got shorted and that’s why I could not locate it. What do you think?

=== Update (08/10/2018) ===

As I mentioned before initially PMIC was heating up as I thought it is shorted but after removing it I still have short on this line. I know what other components are on that line. My question is how do I determine which is faulty as none of them get hot when injecting voltage to that line.

기기:

iPhone 6

현황:

open

승인된 답변:

+508136

편집자: Karolis ,

제목:

Having hard time locating short on PP3V0_NAND

텍스트:

Hi guys,
I have an iPhone 6 was not turning on. After connecting to DCPS I noticed that PMIC heats up. I confirmed that PP3V0_NAND is shorted to ground and using alcohol method I confirmed that PMIC heats up first in that circuit. I removed PMIC expecting that I removed short to ground on PP3V0_NAND but it remained. When I inject voltage up to 3V none of the components heat up but my DCPS showscurrent consumptions. What is going on?
There are not many components on that line but visually they all seem to be OK and none of them produce heat.
My wild guess would be that via within PCB on that line got shorted and that’s why I could not locate it. What do you think?
+
+=== Update (08/10/2018) ===
+
+As I mentioned before initially PMIC was heating up as I thought it is shorted but after removing it I still have short on this line. I know what other components are on that line. My question is how do I determine which is faulty as none of them get hot when injecting voltage to that line.

기기:

iPhone 6

현황:

open

원문 게시자: Karolis ,

제목:

Having hard time locating short on PP3V0_NAND

텍스트:

Hi guys,

I have an iPhone 6 was not turning on. After connecting to DCPS I noticed that PMIC heats up. I confirmed that PP3V0_NAND is shorted to ground and using alcohol method I confirmed that PMIC heats up first in that circuit. I removed PMIC expecting that I removed short to ground on PP3V0_NAND but it remained. When I inject voltage up to 3V none of the components heat up but my DCPS showscurrent consumptions. What is going on?

There are not many components on that line but visually they all seem to be OK and none of them produce heat.

My wild guess would be that via within PCB on that line got shorted and that’s why I could not locate it. What do you think?

기기:

iPhone 6

현황:

open