Magsafe not plug but detected on battery 820-2936-A

[aurel476]

macbook work but on battery magsafe not plug are always detected, with magsafe plug battery charge no problem.
PPBUS_G3H 12,47v
CHGR_ACIN 3.95v
chgr_dcin 15.56
Resistance between pin 27/28 13,24 kohms, pin 17/18 : 6ohms of U7000

acok not pull down ?

how to work

 

[aprendiz]

Resistance between pin 27/28 should de 20ohm, maybe broken trace or bad resistors R7021-R7022.....

 

[aurel476]

i replaced R7021-R7022 resistance between pin27/28 and now 22ohms,

but always problem

 

[dukefawks]

I do not understand what you mean.

 

[aurel476]

on battery without magsafe power status : power adapter, how it's possible because magsafe unplugged

 

[aurel476]

No Title

 

[aurel476]

magsafe unplugged, on battery,
power source status : power adapter

 

[dukefawks]

Ah ok, I guess ACOK from ISL6259 stays high after disconnecting the adapter. Check for corrosion around ISL and clean it. Replace ISL if problem still there.

 

[aurel476]

i replaced it 3 times and still the same problem

 

[aurel476]

it's possible problem with U6901 ?

 

[dukefawks]

No, u6901 is probably fine.
Measure ACOK from ISL when it is running on the battery.

 

[aurel476]

running on the battery ACOK 2,57v

 

[dukefawks]

What is resistance from ACOK to PP3V42? I still think it is bad ISL6259 it should be pulled low by that.

 

[aurel476]

470ohm ACOK to PP3V42

 

[dukefawks]

That is very wrong. It could be U6901, remove it and check resistance again.

 

[aurel476]

removed U6901 and resistance ACOK to PP3V42 470K ohms

 

[aurel476]

i replaced U6901 by other and ACOK to PP3v42 470K ohm

 

[aurel476]

same problem
power source : power adapter (on battery magsafe unplugged)

 

[dukefawks]

Replace 6259 again, it was probably killed by U6901.

 

[aurel476]

replaced new 6259 same problem