820-3787 a1398 - Does not see / reconize / charge battery - liquid damage

[820Slave]

Board runs well but will not recognize / charge battery.

All zeros in system profiler, yet when charger is removed it manages to successfully go to sleep from battery power.

I feel I'm close but obviously missing key things. Please see my marked up image to see all that has been tested. Both new and original battery with same results.

 

[nate8organic]

did you check SMBUS_SMC_BSA line? also don't take measurements in auto mode. use Either K or diode mode.

Its going to be the battery indicator, isl, or smc. or both.

 

[dukefawks]

Bad battery/SMC/ISL6259. Disconnect battery and check voltage on both SMBUS data lines to the battery.

 

[820Slave]

pin 5 of J7050 SMBUS_SMC_5_G3_SCL .4v
pin 6 of J7050 SMBUS_SMC_5_G3_SDA 3.4v / .2v
with no batt connected

tested with 3 batteries
SMC very clean and LD not near there.
has been through UC

 

[dukefawks]

Dead SMC and/or ISL6259 for sure. SMC is most likely, but ISL is easiest, you pick.

 

[820Slave]

not ISL6259

 

[dukefawks]

You can use a donor SMC from a 3787, I believe one from a 3662 will work also.

 

[mrHat]

Hi. I have A1398 model with 820-3662-a board that shows the same problem. Initialy the machine stopped powering on after the owner took it apart to fix the hinges. Then he took it to a technician who managed to make it power on but only with the charger pluged in. After that I got it. The battery is marked with an X and if I take off the charger the machine goes to sleep.
PP3v42 is present
SMBUS lines look ok
I get 11.5 V on CHGR_BGATE witch is pin 4 of Q7155 and I guess that does not alow it to open.
ISL and Q7155 chip have been changed, but I still get 11.5v on CHGR_BGATE.
I am not verry experienced with this but I am trying pretty hard so some help would much apreciated.
Than you.

 

[dukefawks]

Don't hijack threads, start a new one.