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Macbook A1706 Stuck at 5V. No PPBUS
- Thread starter Instafixx
- Start date
OL NO; when you have U7000, or U6903 connected.
Instafixx
Active member
Yes. Short Removed. i put back the board on the chasis. I connect the charger. I get the chime and then nothing. Its back to being dead.
PPBUS is still 0V.
PPVIN_G3H_P3V3G3H is 3.9V
PP3v3_G3H is 2.2V.
Diode Mode Reading to Ground is .384
PM_EN_P3V3_G3H is 4.7V
R6902 and R6915 Resistance Between Pins is 1 -2 Ohms
PPBUS is still 0V.
PPVIN_G3H_P3V3G3H is 3.9V
PP3v3_G3H is 2.2V.
Diode Mode Reading to Ground is .384
PM_EN_P3V3_G3H is 4.7V
R6902 and R6915 Resistance Between Pins is 1 -2 Ohms
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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.
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
Active member
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.
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.
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Check resistance (ohm scale) over C7020/23.
Did you try known good battery?
What is exact PPBUS_G3H voltage?
Did you try known good battery?
What is exact PPBUS_G3H voltage?
Instafixx
Active member
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
C7020/3 is 2.9 Ohms.
Tried a known good battery.
PPBUS_G3H
Without Battery Connected 13.09V
With Battery Connected 12.09V
Instafixx
Active member
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)
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)
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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.
Then it is open to charge the battery; as per your readings.
R6051 is not related with the battery.
Be sure R6950 is good.
Shouldn't be lid sensor problem, if gets stuck in logo.
Get an old battery, but in working condition.
Instafixx
Active member
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 ?
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 ?
Allow 10-15s before checking in diode mode, since the power was disconnected (including battery).