[SOLVED]820-2879-b not getting CHGR_ACOK

[Gannons3]

I have a 2010 macbook pro with an 820-2879-b mother board and it wont turn on, I am getting a very dim green light on the charger and have traced the problem back to the acok circuit, I get all the correct voltages up to pin 1 of R7010. I get 17.09 volts on pin one but 0 on pin 2, R7010 is giving the correct resistance at 30.1k ohms, but R7011 gives .5 ohms on the board and the correct 9.3k ohms off the board, I have no idea why Im getting the wrong value when on the board. While the resistor is off I get infinite resistance between 1 and 2 as expected.

 

[aprendiz]

Measure in diode mode red probe to ground and black probe to F7040, this seems to be a bad U7000.....

 

[Gannons3]

I get .469 on f7040

 

[aprendiz]

Voltage on F7040 only charger???

 

[Gannons3]

280 mv fluctuates slightly

 

[aprendiz]

Voltage on pin 2 from U7000?

 

[Gannons3]

16.3v on pin 2 with random dips to 15.4

 

[aprendiz]

Check value for R7005, R7022 and R7021.... Still think it is a bad U7000...... Also, try known good magsafe....

 

[Gannons3]

268 ohms on r7005, 10 ohms on 7021 10 ohms on r7022

 

[Gannons3]

i have tried a working magsafe and still got the same dim green light on the charger a while ago but i didnt do any measurements with it, i can get it back if needed

 

[aprendiz]

Ok, R7005 is bad, should be 20 ohms, so ISL6259 is bad too, replace both....

 

[Gannons3]

okay will do, thanks a lot

 

[Gannons3]

It worked, thanks

 

[dukefawks]

This happened because of a bad charger, do not use the one that caused this again.