Macbook A1466 Maybe Q7180

[Instafixx]

Hello,
Namaste.

I have a Macbook A1466 with history of liquid spill and repair. The issue currently is that
With Battery Connected
No Green/Orange Light
PPBUS_G3H at 8V.
Fan Spins but no Boot.

Without Battery Connected
Green/Orange Light.
PPBUS_G3H is at 8.6V.
Machine boots after sometime. Apple Logo appears, the loading bar comes to 50% and the machine goes off.

Is it a Q7180 issue ??

[mon2]

Re: Macbook A1466 Maybe Q7180

Check the dual diode that feeds the input voltage into the 3v42 regulator.

Connect the adapter only. Measure the voltage to ground of each pin in the diode. Confirm the 3v42 regulator output.

Repeat with only the battery.

Then attach both.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Check the dual diode that feeds the input voltage into the 3v42 regulator.

Connect the adapter only. Measure the voltage to ground of each pin in the diode. Confirm the 3v42 regulator output.

Repeat with only the battery.

Then attach both.

Which is the diode ?
What is the number on the schematics

[mon2]

Re: Macbook A1466 Maybe Q7180

D7005 in the 820-00165 schematic.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

D7005 in the 820-00165 schematic.

Without Battery / Only Charger{ i am getting a green light now - weird. But no fan spin}

D7005
PPBUS_G3H_R is 8.6v
PP18v5_DCIN_ISOL_R is 16.6V
PPVIN_G3H_P3V42G3H is 16.4V

With Battery Only

D7005
PPBUS_G3H_R is 7.3v
PP18v5_DCIN_ISOL_R is 2.4V
PPVIN_G3H_P3V42G3H is 7.3V

[mon2]

Re: Macbook A1466 Maybe Q7180

Use adapter only (for now). Green light should be on. If it is flaky on the light, use IPA and clean the magnetic contacts of the magsafe connector that powers the logic board. Often the contacts get dirty.

Press the ON/OFF button. If this fails to turn on the board, the fault could be with the keyboard button itself.

Locate the shorting pads on the logic board that you can use with tweezers to emulator the ON/OFF keyboard button. There will be a shorting pad on each side of the PCB.

See attached. These will be empty PCB pads on the logic board.

Use tweezers and short them to check if the logic board is able to turn ON/OFF.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Use adapter only (for now). Green light should be on. If it is flaky on the light, use IPA and clean the magnetic contacts of the magsafe connector that powers the logic board. Often the contacts get dirty.

Press the ON/OFF button. If this fails to turn on the board, the fault could be with the keyboard button itself.

Locate the shorting pads on the logic board that you can use with tweezers to emulator the ON/OFF keyboard button. There will be a shorting pad on each side of the PCB.

See attached. These will be empty PCB pads on the logic board.

Use tweezers and short them to check if the logic board is able to turn ON/OFF.

Now light turns orange from green. (adapter only).
No Fan Spin.
Wont Turn on from the On/Off Key.
Tried shorting R5116. No Activty

[mon2]

Re: Macbook A1466 Maybe Q7180

Post the voltage to ground of the following:

PM_BATLOW_L
PM_DSW_PWRGD
PCH_DSWVRMEM
PM_RSMRST_L
PM_PWRBTN_L

reference:
https://boards.rossmanngroup.com/thr...an-spin.59897/

[Instafixx]

Re: Macbook A1466 Maybe Q7180

post the voltage to ground of the following:

pm_batlow_l
pm_dsw_pwrgd
pch_dswvrmem
pm_rsmrst_l
pm_pwrbtn_l

reference:
https://boards.rossmanngroup.com/thr...an-spin.59897/

pm_batlow_l is 3.28v
pm_dsw_pwrgd is 3.41v
pch_dswvrmem is 2.5v
pm_rsmrst_l is 0v
pm_pwrbtn_l is 3.4v

[Instafixx]

Re: Macbook A1466 Maybe Q7180

One thing i just noticed.
When battery is removed and the adapter is plugged in,
if the board is in the case - there is no fan spin.
if the board out of the case - there is a fan spin.

[mon2]

Re: Macbook A1466 Maybe Q7180

Check for corrosion around U8130.
Be sure R8133 is good.

if the board is in the case - there is no fan spin.
if the board out of the case - there is a fan spin.

When you are in the case, is the battery attached?

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Check for corrosion around U8130.
Be sure R8133 is good.


When you are in the case, is the battery attached?

WHEN IN CASE THE BATTERY IS UNPLUGGED.

GETTING A FAN SPIN ON THE GENUINE CHARGER AND NO FAN SPIN ON HIGHER WATT CHARGER. APOLOGY FOR THIS CONFUSION.

WITH GENUINE CHARGER I AM GETTING pm_rsmrst_l AT 3V.

[mon2]

Re: Macbook A1466 Maybe Q7180

Remain with the original charger. After fan spin, do you have video?

Check with the flashlight behind the display - it is possible that your backlight is gone.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Remain with the original charger. After fan spin, do you have video?

Check with the flashlight behind the display - it is possible that your backlight is gone.

I get graphics.
The apple logo appears. The loading bar goes to 50% and then the device shuts down.

Can it be a battery issue ?

Let me check with a new battery and revert.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

I get graphics.
The apple logo appears. The loading bar goes to 50% and then the device shuts down.

Can it be a battery issue ?

Let me check with a new battery and revert.

So i installed a new battery and the device booted succesfully. Checked the defunct battery of this machine on another machine and that battery is also absolutely fine .

Then reinstalled the old battery again to test.
Now just get a very high fan spin.

So Strange.

[mon2]

Re: Macbook A1466 Maybe Q7180

High fan spin is a sensor fault. Is the trackpad installed? If yes, remove it and test again.

Suggest to investigate the SMBUS SCL and SDA lines for all areas of the logic board. If any of these are stuck (ie. not at ~3v) then that is a fault.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

High fan spin is a sensor fault. Is the trackpad installed? If yes, remove it and test again.

Suggest to investigate the SMBUS SCL and SDA lines for all areas of the logic board. If any of these are stuck (ie. not at ~3v) then that is a fault.

Fan Spin Issue Solved. Trackpad cable wasnt fit properly.

So now the scenario is that
Without Battery
I get normal light on the charger, Fan spin and the machine boots up with chime. Get Logo and 50% loading bar and then it turns off. If i press the on/off key on keyboard everything happens again.

With Battery
No Light on the charger. Machine boots up if i press the on/off key but the same thing happens. Laoding bar goes to 50% and comes back.

READINGS WITH BARE BAORD AND ADAPTER CONNECTED

SMBUS_SMC_0_S0_SDA AND SCL IS 0V [DSPLAY NOT CONNECTED]
SMBUS_SMC_1_S0_SDA AND SCL IS 0.7V
SMBUS_SMC_2_S3_SDA AND SCL IS 0V
SMBUS_SMC_3_SDA AND SCL IS 0.7V
SMBUS_SMC_5_G3_SDA AND SCL IS 3.4V

[mon2]

Re: Macbook A1466 Maybe Q7180

Each smbus pair will feature a pair of pull up resistors. Locate these required pull up resistors and confirm the voltage to ground on each side of these parts.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Each smbus pair will feature a pair of pull up resistors. Locate these required pull up resistors and confirm the voltage to ground on each side of these parts.

SMBUS_SMC_0_S0_SDA AND SCL

R8361 R8362 = 0V on both Pin1 and Pin 2

SMBUS_SMC_1_S0_SDA AND SCL

R5360 Pin 1 and Pin 2 is 0.08V
R5361 PIn 1 and Pin 2 is 0.06V

SMBUS_SMC_2_S3_SDA AND SCL

R5370 and R5371 Pin 1 and Pin 2 is 0V

SMBUS_SMC_3_SDA AND SCL

R5390 and R5391 Pin 1 and Pin 2 is 0V


SMBUS_SMC_5_G3_SDA AND SCL

R5380 and R5381 Pin 1 and Pin 2 is 3.4V


I hope i got the pull up resistors right.

None of these resistors were short to ground.

[mon2]

Re: Macbook A1466 Maybe Q7180

Each of these pull up resistors are bonded to a power rail. This means that each such rail is missing the voltage.

Is this also the 820-00165 logic board?