Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

[justin35]

Macbook a1502 820-4924 liquid damage
There was a problem with sensing resistors tracks
Missing tracks from r7120 to r7121 r7122 and also from 7121&7122 to isl chip.
I ran a wire from r7120 to both r7121 and r7122.
Restored tracks to isl chip also
The board works now, the only problem is when i power on the laptop from battery, if i plug magsafe it shows 100% on battery percentage, and when i disconnect magsafe laptop restarts itself...

Any idea?

[justin35]

Re: Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

Ok, i replaced isl chip, some capacitors that i suspect were bad, but no luck!
Restored 2 individual tracks from r7120 to r7121 and r7122.
Now when i conect magsafe battery is showing the right percentage, but when i disconnect magsafe, board restarts itself.
Without battery connected i have 12.51v steady ppbus_g3h
With battery connected my ppbus is 11.4 to 12.4v fluctuating. The battery was 22% and charging...
Could this be the battery?

[piernov]

Re: Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

Yes, try another battery if possible. Or let this one charge overnight and try again.

[justin35]

Re: Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

I found another chassis with battery inside.
Battery was drained out 0%
I mounted the board inside and started to charge the battery, now is at 12%
If i remove magsafe, board restarts itself.
So it's not the battery...

[justin35]

Re: Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

I changed again ISL6259 - no luck
I saw some capacitors around smc which i didn't like and replaced them too -no luck
I replaced d7010 since it was missing in the first place(and i wasn't sure if the one used is good), and without it board is "dead". Also dcin_isol_gate was 0.7v with before i replaced d7010, now is around 6,7-6,8v
I measured jumping voltage on d7050 pin 1&2 - smbus_smc_5_g3_sda & smbus_smc_5_g3_scl, and they are fluctuating ... lowest i got is 2,75v when the board starts, and 3,22v to 3,42v constantly up and down (with battery plugged)
Without battery a i get a steady 3,42v
with battery connected my ppbus_g3h is 12.31v(steady) and without battery is 12.58v (steady)
I did reflow the smc at this point - no luck....

i don't know what else to do....

[justin35]

Re: Macbook a1502 early 2015 820-4924 - liquid damage strange behavior

Today I tried a known good battery, and the problem is still there.
When i disconnect magsafe laptop restarts, as the battery power is not enough to sustain the laptop on.
After disconnecting and restartin the latop works perfectly on battery...
Is there any asd for this board?