820-3476 no battery

[arnonabuurs]

Hi guys i have an 820-3476 that runs off charger, orange and green light. As soon as I have the battery connected the light is off and PPBUS fluctuating between 8-4v. Did replace U7100 just because its easy but that didnt fix it ofcourse.Im pretty bad fixing battery related issues, some guidance would be helpful. I did see some melted solder balls around Q7130 as well as Q7520 but have not replaced those yet. Should I just replace them or is there a way to make sure these are OK?

 

[2informaticos]

Why do you replace components without measuring them, or something related???
I wish have an eye that can show me the board problems whitout checking anything...
For the moment I have to work with only one; which doesn't have such aptitude, of course.

Post F7140 voltage, on charger only.
Check if Q7155 is not shorted.

 

[JohnB8812]

Does it see the battery in the OS or does it give you an X through the battery? Also yes PPBUS charger only as 2informaticos asked

 

[arnonabuurs]

Just wishful thinking, because im a noob

PPBUS without battery is 12.57v
Q7155 readings on pin 1-4 but OL on pin 5

The mac will not start, when i connect the battery no light on charger and PPBUS is 11.72v, it was stable so i didnt see it fluctuate as mentioned before.Tried it a few times to make sure.

 

[2informaticos]

Magsafe light goes off when battery is connected and comes back when remove it?

Check voltage and resistance to ground at SCL/SDA lines of battery bus.

 

[JohnB8812]

If it starts off just the charger and PPBUS is 12.57 volts, I think you simply have a dead battery preventing power...tried another battery?