A1398 820-3332-A not charging

[hgoncalves]

Hi,
D6950 was (and still is) already out.

Diode mode:
SCL= 0.562V
SDA= 0.558V

Voltage:
SCL=3.4V
SDA=3.4V

As I have already replaced SMC, I want to check ISL6259 first, but can't find it in my schematics. Are you sure that is the one?

 

[2informaticos]

What about U7000?

 

[hgoncalves]

Hi,
I've repalced U7000, but same result. Shall i replace SMC again?

 

[2informaticos]

Try known good battery first.

 

[hgoncalves]

With the known good battery is the same, and this battery on other mac, does work.

 

[2informaticos]

Then replace SMC.
Be sure to solder it properly.

 

[hgoncalves]

Hi,
I've replaced the SMC, but everything is the same.
Any more ideas?

 

[2informaticos]

Try another DCIN board.

 

[hgoncalves]

Same thing with new DCIN board

 

[2informaticos]

What is actual state of Magsafe light?
Try original charger and lab PSU with Magsafe 1 85W cable.

 

[hgoncalves]

Hi,
The magsafe doesn't have light with the magsafe 1 (Original or PSU). However, with the original magsafe 2, it has a green light.

 

[2informaticos]

There is a problem.
Battery cannot be charged, if no correct Magsafe light.
Post again U6900/01 voltages in this case (no light).

 

[hgoncalves]

OK, I'll do so. But the battery isen't even recognized by the OSX. Does that mean anything?

 

[2informaticos]

Check R6950 and communication with battery connector.
Inspect the connector; measure on top of connector pins, instead of board pins.

 

[hgoncalves]

hi,
I have continuity between R6950 and the battery connector. The connector seams ok, on top and on back. However, i don't get any voltage on R6950 (don't know it it is supposed to have some voltage there without the battery connected).

 

[hgoncalves]

Without light:

U6900:
1 = 3.4 V
4 = 3 V
5 = 3 V

U6901:
1 = 3.2 V
2 = 3.2 V
4 = 3.4 V
5 = 3.4 V ( it rebooted when measured on first time)

 

[2informaticos]

The DC voltages are correct, missing communication I supposed.
You can confirm with o-scope.
Be sure to have good continuity between U6900 and central pin on the Magsafe connector.

R6950 just ties SYS_DETECT_L to ground, in order to enable to battery.

An o-scope can also confirm activity on SCL/SDA lines of battery bus.

 

[hgoncalves]

I have activity on SCL/SDA (attached img) but not sure if the correct activity (measured on SCL/SDA J6950 pins)
I have continuity between central pin of magsafe and the pin 5 of the U6900

 

[2informaticos]

Do you also note activity on pins 4 & 5 of U6900?

 

[hgoncalves]

Yes, i have activity on 4 and 5 of U6900. The wave not as sharp as before (much more messi/faster) but i do have activity)