820-3437 - does not recognize charger

[2informaticos]

Tried original and fake charger?

 

[Palhano]

Original 45w with battery, problem.
Original 85w with battery, works normally.
I have no fake source! I used the bench source, it works normally.

 

[2informaticos]

Try another 45W charger.
Good one should have 14.5V when connected to the machine.

 

[Palhano]

I've already tested it with two original 45w chargers, same problem! I tested the chargers on other Macs, they worked! they are 100%

 

[2informaticos]

All drop to 7.7V???

Check R/D7012 and Q7010.

 

[Palhano]

I discovered that the voltage drops more. it ended up with 2v. But only when the battery is connected. I measured directly on the J7000.

I replaced the R/D7012 and Q7010 to test, same problem. I tested the charger without the q7010, the PPDCIN on the j7000 had a stable 15v with the battery connected. I tested a new Q7010, the problem returned.

This problem is really crazy.

 

[2informaticos]

Original magsafe charger 2 gets blocked, if detects leakage on the Mac.

Post R7180/81 and R7185/86 values, measured onboard, ohm scale.

 

[Palhano]

The strange thing is that only the original 45w magsafe does this

R7180 - 100k
R7181 - 62k
R7185 - 470k
R7186 - 332k

 

[2informaticos]

Post Q7010 voltages.
With the charger which machine works.
Also check U7100 basic voltages.

 

[Palhano]

Situation got worse.
Now it only turns on without a battery. I tested with 85w and now I have a problem with 45w, without LED and low PPDCIN.

Q7010 - without battery and with magsafe 45w
1 - 15v
4 - 6.7v
5 - 15v

U7100 - is there any point in measuring without battery power?

 

[2informaticos]

Post U7100's basic voltages: pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.

 

[Palhano]

Follow voltages. Without battery and with magsafe 85w

1 - 0
2 - 16v
3 - 4.2v
9 - 0
12 - 3.4v
13 - 3v
14 - 3v
15 - 0
17 - 8.5v
19 - 5v
20 - 5v
27 - 16.5v

 

[2informaticos]

A bit strange, 85W charger should deliver 18.5V, not 16.5V.
What is PPDCIN_G3H voltage?

 

[Palhano]

PPDCIN_G3H with 16.5v.
The 45w MagSafe no longer works.

 

[2informaticos]

Original 45W charger, how much drops PPDCIN_G3H?
Test with it in SMC bypass also.

 

[Palhano]

the 45w drops more every day! now it stays at 2v and keeps going down

 

[2informaticos]

Any chance to test with other original 45W charger?
45W fake one should work, can't drop by itself.

 

[Palhano]

I've already tested it with two original 45w. Both don't work. I don't have a fake to test.

I tested two original MagSafe 85w on another Air working 100%, PPDCIN hit 16.5v too.

This board is difficult! =/

 

[2informaticos]

Change again Q7180.

 

[Palhano]

I had already changed it, but I changed it again. Nothing changed!