Hi guys i have an A1278 Macbook Pro 2010 820-2879 that doesn't charge the battery.It can run of a battery.I tried almost everything i know. But PPBUS_G3H just keeps reading 12.21V
Things i tried are as follows: I have another identical Board that gives 12.56v on PPBUS_G3H only thing is it has a bad GPU it seems. So i took most of the parts from it and slapped it onto this good board am working on presently... but it's PPBUS_G3H stays at 12.21v. Have 3x known good batteries. I swapped the SMC.I also swapped the ISL.Tried 2 ''new'' ISL on it.I swapped Q7030 and Q7035 at the same time i tried the new ISL's.Changed R7051 R7052,C7025,R7005,R5087
PPBUS_G3H = 12.21v
SMC_Reset_L = 3.3V
R5280 + R5281 SMBUS_SMC_BSA_SDA and SMC_BSA_SDA_SCL are both 3.4V
on the ISL
R7021 = 12 ohms
R7022 =12 ohms
R7051= 4.5 ohms think my multimeter can't go so low. When i touch my probes i get 2.3 ohms. So if i subtract that from the readings it will be good. So both R7051 and R7052 may be good.
R7052= 2.4 ohms
Pin 2= 16.2v
Pin 3= 3.9v
Pin 18= 12.2v
Pin 17= 12.2v
Pin 14= 3.193v
Pin 23 = 12.22v
Pin 24 = 12.56v
Checked all the resistors around the ISL. They all read ok.Really don't know where else to check for any abnormal voltages or resistances. Unless maybe the SMC is still bad which i doubt cause i took it from the working board.And i did a very good reball job as i have the tools to do it.
Hoping you guys can help.This is not a customer machine it's my spare board just wanted to solve it so that i can build my skill level. thanks.
Things i tried are as follows: I have another identical Board that gives 12.56v on PPBUS_G3H only thing is it has a bad GPU it seems. So i took most of the parts from it and slapped it onto this good board am working on presently... but it's PPBUS_G3H stays at 12.21v. Have 3x known good batteries. I swapped the SMC.I also swapped the ISL.Tried 2 ''new'' ISL on it.I swapped Q7030 and Q7035 at the same time i tried the new ISL's.Changed R7051 R7052,C7025,R7005,R5087
PPBUS_G3H = 12.21v
SMC_Reset_L = 3.3V
R5280 + R5281 SMBUS_SMC_BSA_SDA and SMC_BSA_SDA_SCL are both 3.4V
on the ISL
R7021 = 12 ohms
R7022 =12 ohms
R7051= 4.5 ohms think my multimeter can't go so low. When i touch my probes i get 2.3 ohms. So if i subtract that from the readings it will be good. So both R7051 and R7052 may be good.
R7052= 2.4 ohms
Pin 2= 16.2v
Pin 3= 3.9v
Pin 18= 12.2v
Pin 17= 12.2v
Pin 14= 3.193v
Pin 23 = 12.22v
Pin 24 = 12.56v
Checked all the resistors around the ISL. They all read ok.Really don't know where else to check for any abnormal voltages or resistances. Unless maybe the SMC is still bad which i doubt cause i took it from the working board.And i did a very good reball job as i have the tools to do it.
Hoping you guys can help.This is not a customer machine it's my spare board just wanted to solve it so that i can build my skill level. thanks.
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