A2289 MacBook Pro - No power - Need help!

[Dallas90]

Hi everyone,

I need your help with repairing this Macbook Pro. The fault is that the laptop does not power on. there are different current draw from the various USB ports.
It is worth mentioning that there is no liquid on the board after a visual inspection. below you can see all readings and info after some diagnostic.

There are also some thermal images uploaded in the thread.

What should I do next? any suggestions?

Thanks in advance.


Current draw:
USB port 1: 4.9V - 0.356A
USB port 2: 4.9V - 0.056-0.60A

When power connected to USB port 1:
F7000 - PPBUS_G3H - 12.30V (both pin 1 and 2).
Both U3100, U3200 and L6901 lights up on thermal.

Voltages near U3200:
C3208 - 3.254V
C3205 - 1.582V
C3200 - 3.311V

Voltage near U3100:
C3105 - 1.231V
C3108 - 2.813V

When power connected to USB port 2:
F7000 - PPBUS_G3H - 0.890V (both pin 1 and 2).
Only U3100 lights up on thermal.
C3208 - 0V
C3205 - 0V
C3200 - 0V

Voltage near U3100:
C3105 - 1.245V
C3108 - 2.904V


Readings around U3200:

C3208 - D:0.085 R:99.9 ohm
C3205 - D:0.511 R:1.002 Mohm
C3200 - D:0.366 R:1.600 Mohm
R3020 - D:0.000 R:0.01 ohm
R3205 - D:0.530 R:0.982 Mohm
R3208 - D:0.562 R:1.002 Mohm

Readings around U3100:

C3105 - D:0.070 R:81.7 ohm
C3108 - D:0.019 R:22 ohm
R2834 - D:0.086 (pin 1) 0.499 (pin 2) R:103 ohm (pin 1) 2.281 Kohm (pin 2)
R3108 - D:0.019 (pin 1) 0.568 (pin 2) R:22.1 ohm (pin 1) 1.001 Mohm (pin 2)
R3109 - D: 0.019 (pin 1) 0.565 (pin 2) R:22.1 ohm (pin 1) 1.001 Mohm (pin 2)

[mon2]

C3208 - D:0.085 R:99.9 ohm


C3105 - D:0.070 R:81.7 ohm
C3108 - D:0.019 R:22 ohm

The above parts look like suspects. Carefully flux and remove each with low air pressure -> keep track of each location & part that was removed -> then check the resistance of each PCB pad after the board has cooled off. No power in the resistance checks.

[Dallas90]

Hi Mon2,

Thanks for your reply.

The values are the same when the components are removed, I also replaced them. no difference.

[mon2]

Voltage near U3100:
C3105 - 1.245V
C3108 - 2.904V

Based on these voltage measurements; the low resistance to ground check and diode mode readings - this ACE controller (CD3217) is defective. Wait on others to comment but this power delivery controller does not appear to be normal. These test points are the LDO rails and the 1v5 rail is used to power the BMC interface for the CCx power delivery lines. The results indicate that there is internal damage to the controller.

[Dallas90]

Thanks again Mon2 for your reply.

That was my conclusion too, but there is a strange reading on C3208 (D:0.085 R:99.9 ohm and 3.254 V) so I'm not sure if its U3100 or U3200 that is causing the problem. any suggestions?

[mon2]

C3208 has a close enough LDO voltage to 3v3 so will consider this rail to be ok.

With the noted components off the board for U3100 - is the thermal scan showing a lower temp for U3100?

[Dallas90]

It's like 8-10 Celsius difference between U3100 and U3200 you can see for yourself in the photos I uploaded. U3100 46-48 Celsius U3200 36-38 Celsius

[Dallas90]

C3208 has a close enough LDO voltage to 3v3 so will consider this rail to be ok.

With the noted components off the board for U3100 - is the thermal scan showing a lower temp for U3100?

sorry, i didnt understand your request. so just to clearify, do you want me to remove the caps and check with thermal again?

[Dallas90]

There is no diffrent in heat when the components are off the board. How shall i proceed?