820-2850 Battery not detected.

[Dewanbd]

820-2850 Battery not detected.
Turn on with charger, green light , in osx shows no battery, but if i take out power adapter the laptop works
fine with battery. This is know good battery, Battery indicator no light. Any help please.

 

[piernov]

Same with BIL disconnected?

 

[Dewanbd]

BIL ??

 

[2informaticos]

J6955, BIL connector.
If still the same, post voltage and diode mode to ground at SCL/SDA lines.

 

[Dewanbd]

Yes , same with bill disconnected.
Voltagae and SCL= 1v, SDA= .5v TO 0V
diode mode to ground at SCL=.34, SDA=.463

 

[2informaticos]

You have problems on I2C battery bus.
Remove D6950 and check again.

 

[Dewanbd]

After remove D6950
Voltage at SCL= 1v, SDA= .6v to 0
diode mode to ground at SCL=.342, SDA=.461

 

[Dewanbd]

AT u7000
R5280=2K
R5281=2K , u7000??

 

[2informaticos]

"Voltage at SCL= 1v, SDA= .6v to 0"
With charger connected???

 

[Dewanbd]

yes, it should be 3.4 V , do you know how to get idea how this charging do work?

 

[2informaticos]

You have big difference on SCL/SDA lines in diode mode.
Could be U7000, or SMC.
Remove first C6952/53 (if present) and check again.

 

[Dewanbd]

After removing c6952/53 got scl=.323 and sdl= .454, Changed isl625, scl=.454, sdl=.454 but voltage at sdl =0 , scl=3.42. it could be smc??

 

[2informaticos]

If both lines have now the same diode mode reading, this is a progress.
Be sure R5280 is good snd check continuity to SDA line.

 

[Dewanbd]

R5280 is good 2k and continuity to sda line is ok, Pin 10 at u7000 =0 v. it could be u7000 itself faulty or smc?

 

[2informaticos]

Check SDA level directly on the battery connector and R5280.

 

[Dewanbd]

SDA level directly on the battery connector and R5280 is ok and 0 v.

 

[2informaticos]

Check again diode mode on SCL/SDA lines.

 

[Dewanbd]

diode mode on SCL/SDA lines.= .479 and .464

 

[2informaticos]

Not a good difference there.
Change U7000 again.
If issue persists, change SMC.

 

[Dewanbd]

Change u7000 again no luck. dont have right donor board. so will do it latter.