Macbook A1706 Stuck at 5V. No PPBUS

[Instafixx]

Okay! I ll do that tomorrow!!

But shouldn’t the reading be OL ?

 

[2informaticos]

OL NO; when you have U7000, or U6903 connected.

 

[2informaticos]

Put correct 2.2 ohm for R6907.
However, it is used only in battery mode.
Charger powers up through R6902.
You should check if D6902 is OK; or just replace it.

Your problem may be on the 3V42_G3H line, but first assure to have good R/D6902.

 

[Instafixx]

i just replaced D6902 and i now getting ppbus and 20V on the amp meter. Let me put it back to the chasis and see if it boots up

 

[Instafixx]

It was working well but one fan wasnt spinning. So i removed the board and saw that the fan wasnt connected ( the one that connects to the keyboard.

after connecting that fan started spinning very fast so i disconnected it and the machine went dead again. Same short as before. Working on it again. Is the fan bad ?

Had to replace the Capacitor again.

Diode D6902 Pin 1 has no voltage again. Replacing that too.

 

[Instafixx]

It will not boot with battery connected and amp meter reboots every2-3 seconds on all 4 ports.

Without battery it boots up fine

 

[2informaticos]

Check resistance (ohm scale) over C7020/23.
Did you try known good battery?
What is exact PPBUS_G3H voltage?

 

[Instafixx]

R6051 missing from the board. Replaced. Working Now with Battery

 

[Instafixx]

I dont kow how it happened but it got knocked off again. Now the point is missing from the board so i had to run a jumper wire from the test point on other side of the board to pin 2 of R6051. I get diode mode reading of .750. But still it is not working on battery.

C7020/3 is 2.9 Ohms.
Tried a known good battery.

PPBUS_G3H
Without Battery Connected 13.09V
With Battery Connected 12.09V

 

[Instafixx]

Q7560 Voltages

With Battery Connected.

All at 12.07V Only TBA_BGATE at 4.2V

Without Battery

All at 13.09V

SCL/SDA Lines at the Battery Connector is .430 Diode Mode to Ground.

If i connect the charge first and the connect the battery after machine is booted. Restart it.
It detects the battery. Charges it too.

If i shut it down with charger connected and switch it on. It boots up normally as well.

But it switches off i remove the charger.

My hall sensors are working fine too. ( Was going through another post on this forum)

 

[2informaticos]

Do you mean Q7065, instead of Q7560?
Then it is open to charge the battery; as per your readings.

R6051 is not related with the battery.
Be sure R6950 is good.

 

[Instafixx]

[UPDATE]

With Internal LCD Disconnected and external video connected the machine draws a steady 20V and i can see the apple logo on the monitor. But it gets stuck there.

Can it be a Hall Sensor Issue ?

 

[2informaticos]

Shouldn't be lid sensor problem, if gets stuck in logo.

 

[Instafixx]

Then ? It worked randomly for sometime with the battery. But then again after sometime back to this. I dont have a known good battery to eliminate if its a battery issue. Any other checks?

 

[2informaticos]

Get an old battery, but in working condition.

 

[Instafixx]

Hi, i got a working battery to test. Its not working.
Moreover the machine went dead again stuck at 5V
again i see PPVIN_G3H_P3V3G3H is shorted .
I ll remove all components and check again. If its D6902 then it will be the third time i ll change it.
Why is it getting shorted ?

 

[2informaticos]

Allow 10-15s before checking in diode mode, since the power was disconnected (including battery).