Released on September 19, 2014, this 5.5" screen iPhone is the larger version of the iPhone 6.

967 Questions View all

iPhone 6 Plus BUTTON_TO_AP_HOLD_KEY_L cut issue

Hi

as in photo below

if the line

BUTTON_TO_AP_HOLD_KEY_L

from power ic to GPU

was cut by removing resistor etc

what are the effects

and what are the function of

BUTTON_TO_AP_HOLD_KEY_L

Block Image

Answered! View the answer I have this problem too

Is this a good question?

Score 0
Add a comment
Deck the Halls
With tools and Fix Kits

1 Answer

Chosen Solution

That resistor is a "pull-up" resistor. Designers use pull-up (or pull-down) resistors so that the state of the signal, in this case BUTTON_TO_AP_HOLD_KEY_L, is in a known state; in this case @ 1.8V (or "high" or "1") unless the line is brought down to 0V.

The line designator explains what it does...button (hold key) to application processor with an active "Low" signal. Basically, if the Power button is pressed, it's signal will go Low and it will notify both the PMIC and the CPU of this for appropriate downstream actions. Just follow it through the schematic to see where it goes.

EDIT 2017/10/6

Think of the circuit like this:

Block Image

Now imagine that you cut a line or remove components and you will have a better understanding of what the impact is.

Was this answer helpful?

Score 3

Comments:

if we cut the line

what are effects

and basically what is the utility of such line

by

thank u very much

this line is come from power ic and divided into 2 line

one for power switch key

another on for gpu

so if the one to power switch key is ok

but we removed or cut the other one going to gpu

what will happen

by

see my edit to the answer...

by

thank u man u really helped me

by

Add a comment

Add your answer

profkefah will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 5

All Time: 64