820-2936 green light OK, PPBUS _G3H 3.46V

Rozakis

New member
Hello guys,

someone tried to change the battery on a 820-2936 MacBook with a fake one and now it does not start. I get a green light in the charger but PPBUS_G3H is 3.46V.

On ILS chip U7000 I measure resistance 17/18 3.2Ohm and 27/28 is 20.4Ohm.

What do I measure first?
 

2informaticos

Administrator
Staff member
First, diode mode to ground at L7030.
Next some voltages for U7000; pins 1, 2, 3, 9, 12, 13, 15, 19, 20.

Try to start in SMC bypass mode.
Do not connect battery again, untill get the board working on charger only...
 

Rozakis

New member
So, Diode mode to ground at L7030 is 0.442V

U7000 pins measures:

pin 1 0.003V

pin 2 16.34V

pin 3 3.93V

pin 9 0.028V

pin 12 3.469V

pin 13 3.437V

Pin 15 0.047V

Pin 19 5.03V

Pin 20 5.03V

How do I start in SMC bypass mode?
 

2informaticos

Administrator
Staff member
Check again, you have too big difference; should be less than 1%.
If still bad, remove D6950 and check again.
Also disconnect BIL connector.
Next step, if needed, remove ISL6259.
If still difference, SMC is the last option...
 
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