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MacBook Pro 13" A1502 820-4924-a

M

myiannakou

Member
With battery connected the charger light will after 30 seconds or so turn off. MacBook will still stay on and run but battery no longer charging.
I then have to remove the charger from the mains and count to 20/30 seconds before the charger will work again.
If I plug the charger back in the same thing will happen.
With battery connected PPBUS is 11.33v (which is wrong) should be 12.56
If I disconnect battery PPBUS back to normal.
The board must of has some work done on it in the past as it's been run through an ultrasonic ( I can tell)
Can't see any signs of corrosion although the dc-in port was burnt out when client dropped it off.

Have tried SMC/PRAM resets. Have tried a new battery. Have not tried an SMC reflow yet
 
2informaticos

2informaticos

Administrator
Staff member
"With battery connected PPBUS is 11.33v (which is wrong) should be 12.56"
Do NOT make wrong assumptions so easy.
PPBUS_G3H voltage depends by battery charge level, if is connected!

Did you try known good DCIN board?
I'm not sure if you said it was burnt.
Your english is not easy to understand; try a better translation, please.
 
2informaticos

2informaticos

Administrator
Staff member
Don't go so fast, or you risk to fry the board.
Put some logic on your job.

First, check continuity between U7000 and central pin of Magsafe connector.
If good, post U7000 voltages.

Just in case, check voltage and diode mode to ground at SCL/SDA lines of battery bus.
 
2informaticos

2informaticos

Administrator
Staff member
The schematic is VERY CLEAR.
Which pin do you think have in common DCIN board, U7000 and J7000???
Apart of ground, of course...
 
2informaticos

2informaticos

Administrator
Staff member
How this can assure good contact with central pin of Magsafe connector???
DCIN board has 1-2 small resistors/coils in series in that line.
I hope you don't need DCIN schematic to find them.

As you already tried (supposed) good DCIN board, your problem should be on MLB.
However, to avoid J6700 failure, I still recommend to check directly between U7000 and Magsafe connector (on DCIN board).

"If good, post U7000 voltages."
Don't forget...
 
M

myiannakou

Member
What is J6700 ??? I have checked from the middle pin on MagSafe to Pin 5 of U7000 and there is no problem with continuity.
Do you want U7000 voltages without battery plugged in?
Thanks

Note " I hope you don't need DCIN schematic to find them. " lol that's really funny hahahaha :)
 
M

myiannakou

Member
U7000 Readings with MagSafe plugged in amber light (no battery)

Pin 1 - SMC_BC_ACOK_VCC = 3.395v
Pin 2 - Ground = 0v
Pin 3 - Unconnected = 0v
Pin 4 - Sys_Onewire = 3.373v
Pin 5 - Adapter_Sense = 3.373v
 
2informaticos

2informaticos

Administrator
Staff member
Any reason to check it with amber lighr present???
We try to find why Magsafe light goes off; don't you want to check voltage then?
 
2informaticos

2informaticos

Administrator
Staff member
U7000 voltages present interes, if Magsafe light stays off.
If you get the light, do you think that U7000 can have bad voltages?
You didn't mention the problem ONLY appears with battery connected.

"check voltage and diode mode to ground at SCL/SDA lines of battery bus"
Still pending...

Did you try known good battery?
 
M

myiannakou

Member
With battery ONLY I get the following:-

SCL = 3.383v .496
SDA = 3.383v .494

Yes have tried with different known good batteries.

If I plug the charger in the light goes out one second before I get USB activity and then the voltages are not stable on SCL and SDA.

SCL & SDA fluctuate from 2.81 to 3.38v

To answer your question " If you get the light, do you think that U7000 can have bad voltages? " I think NO and that means U7000 Good?
 
2informaticos

2informaticos

Administrator
Staff member
Possibly, that's the reason I asked about SCL/SDA and known good battery.
However, is better to get U7000 voltages when the problem appears.
 
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