Hello,
This Macbook does not turn on:
The power button is ripped, I received it like this and the machine was working fine with a ripped power button as boots when plugged in.
Current state:
When plugged in the USB meter goes to 20v /~0.5 gradually increasing to 0.7a charging for 10s then resets charging but remains at 20v, current draw drops to around ~40/50mah then restarts a second later looping.. all 4 ports are the same.
The touchpad responds (vibrating when pressed) but also is cycling on and then off.
PP3V_G3S -> Present (3.35v) on Battery or just Charger, NOT cycling, always present!
PP5V_G3S -> Present (5.12v) on Battery or just Charger, NOT cycling, always present!
3v3_G3H_RTC -> 3.3v on Battery or just Charger.
There is 3.3v on the Power button connector and when shorted to ground nothing happens.
The fans do not spin at any point..
I am not sure where to go from here, is this a charging fault with the CD3215 IC's or something else.
I have checked as many areas as possible for shorts, all inductors I have seen and checked on the board are not short.
U7800 has no shorts in the output inductors and has voltages present on several of them.. I am not sure if at this point all of them should be on..
The voltages present on U7800 turn off for a split second when the charging resets!
Voltages present on u7800 (Some have multiple outputs and are all present):
PP1V8_SLPS2R -> 1.8v
PP0V9_SLPDDR -> 0.9v
PP1V1_SLPS2R -> 1.1v
PPVDDCPU_AWAKE -> 0.74v
PP0V82_SLPDDR -> 0.81v
PPVDDCPUSRAM_AWAKE -> 0.79v
MISSING (Not sure if should be present at this stage):
PVCCPCOREPRIM -> 0v (SW0 & SW1)
P1VPRIM -> 0v (SW0 & SW1)
On the charger with battery dis-connected:
PP_G3HOT:
12.55v @ 38mah then every 30s it changes to 12.22v @ 60mah!!
Battery is currently at 11v.
I can upload photos of the board and I have the boardview and schematics from this forum.
I have thoroughly inspected the board under the microscope and no damage can be seen.
Many thanks.
This Macbook does not turn on:
The power button is ripped, I received it like this and the machine was working fine with a ripped power button as boots when plugged in.
Current state:
When plugged in the USB meter goes to 20v /~0.5 gradually increasing to 0.7a charging for 10s then resets charging but remains at 20v, current draw drops to around ~40/50mah then restarts a second later looping.. all 4 ports are the same.
The touchpad responds (vibrating when pressed) but also is cycling on and then off.
PP3V_G3S -> Present (3.35v) on Battery or just Charger, NOT cycling, always present!
PP5V_G3S -> Present (5.12v) on Battery or just Charger, NOT cycling, always present!
3v3_G3H_RTC -> 3.3v on Battery or just Charger.
There is 3.3v on the Power button connector and when shorted to ground nothing happens.
The fans do not spin at any point..
I am not sure where to go from here, is this a charging fault with the CD3215 IC's or something else.
I have checked as many areas as possible for shorts, all inductors I have seen and checked on the board are not short.
U7800 has no shorts in the output inductors and has voltages present on several of them.. I am not sure if at this point all of them should be on..
The voltages present on U7800 turn off for a split second when the charging resets!
Voltages present on u7800 (Some have multiple outputs and are all present):
PP1V8_SLPS2R -> 1.8v
PP0V9_SLPDDR -> 0.9v
PP1V1_SLPS2R -> 1.1v
PPVDDCPU_AWAKE -> 0.74v
PP0V82_SLPDDR -> 0.81v
PPVDDCPUSRAM_AWAKE -> 0.79v
MISSING (Not sure if should be present at this stage):
PVCCPCOREPRIM -> 0v (SW0 & SW1)
P1VPRIM -> 0v (SW0 & SW1)
On the charger with battery dis-connected:
PP_G3HOT:
12.55v @ 38mah then every 30s it changes to 12.22v @ 60mah!!
Battery is currently at 11v.
I can upload photos of the board and I have the boardview and schematics from this forum.
I have thoroughly inspected the board under the microscope and no damage can be seen.
Many thanks.
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