820-2936 battery always up to 53%

[MDY]

This board recognised the batteries. I tried with 2 but charged them only up to 53%
PPBUS is 12.60V. Battery indicator is not connected.
Any suspect?

 

[dukefawks]

Sense resistors, the usual.

 

[MDY]

ISL6259

pin17-18 3.60ohm
pin 27-28 21ohm

seems ok. Or you mean another resistors?

 

[jason_microsoldering]

What happens when it reaches 53%?

 

[MDY]

Stop charching. If I disconnect battery, it still run.

 

[jason_microsoldering]

Does it say battery is not charging? Or does it say fully charged?

 

[dukefawks]

2 main suspects would be a bad battery or Q7055. Your sense circuit does indeed seem fine.

 

[MDY]

UPDATE to this topic. Still I didnot do anything.

PPBUS only battery - 11.61V
PPBUS only ac adapter - 12.58V
PPBUS both - 12.58V

It power on when battery and ac adapter are coonected and only with battery
Only with ac adapter never power on.
But if I connected ac adapter and battery it will power and later I can disconected battery or ac adapter and it will still work.

Never charge the battery. Just keep the charge to the same %. Yestarday I wasnot checked that. It is 53% but if it goes to 40% it will stay at 40%. Will not charge to 53% anymore.

Magsafe alwasys is off. Only one time was green.

After all that do you still suspect Q7055 or could be ISL or SMC?
ACOK in ISL - 3.31V

 

[dukefawks]

You have no green light.....
Bad magsafe board? Check one wire circuit