820-2936 only green light, no charging

andrespi

Member
this macbook does not charge, only green light appears.I already did a test with another good battery and magsafe board same problem
.One piece of information: the macbook only turns on with the charger and battery, when I place only the charger, the fan restarts after a while and no video.Also battery customer its no original apple

some measurements with charger only
PPBUS_G3H=12.64
PP3V42_G3H =3.46
measurements with charger and good battery
PPBUS_G3H=12.0
PP3V42_G3H =3.46
 

2informaticos

Administrator
Staff member
Post exact resistance between pins 17/18 and 27/28 of U7000.
Check if works in SMC bypass mode, with charger only.
 

andrespi

Member
between pins 17 and 18 charger =132 ohms
between pin 27 and 28 charger=20.2 ohms

macbook with charger only turn on and video in bypass mode
 

andrespi

Member
r7052= 130 ohm but it had a glue from the component on the side Q9425 I removed it and the value was new r7052=3.2ohms
r7051=2.4ohms
traces is good
 
Last edited:

2informaticos

Administrator
Staff member
Is the battery recognized by macOS and correctly shows is percentage?

Test the board disconnecting BIL (J6955).
Post voltage and diode mode to ground at SCL/SDA lines of battery bus.
 

andrespi

Member
Is the battery recognized by macOS and correctly shows is percentage? yes
SCL/SDA=0.521/0.519
but it is detecting me ast bad battery and batery is good, and fan is spinning me too much
 

2informaticos

Administrator
Staff member
"macbook with charger only turn on and video in bypass mode"
Run HWMonitor and look for strange I/V and temp values.

Fan spining high points to some temperature sensor issue.
Did you test with known good trackpad flex/board?
Also test disconnecting webcam.
 

andrespi

Member
hello already well regulated fans; no problems.
My question is if the non-original apple battery can be the cause of problems in charger U7000 or resistors?
como se si una bateria no original de apple cumple con las especificaciones tecnicas de voltage, corriente, capacidad y no tenga problemas en el equipo?
algun valor me pueda indicar de referencia ?
puedo seguir usando bateria no original de apple sin problemas?
 

2informaticos

Administrator
Staff member
The board should turn on and boot without battery.
If only turn on in SMC bypass mode (without battery) there is a problem with a SMC sensor.
Check all sensors from pages 49-50.
Should be good to run corresponding EFI ASD test.
 

andrespi

Member
ok thanks, the macbook already turns me on without battery after solving the resistance problem, I already did the efi test and it passes. what I wanted to ask you was if a non original-apple battery can cause problems on board, its possible? thanks
 
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