Macbook A1466 Maybe Q7180

[Instafixx]

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?

Yes its 820-00165

[mon2]

Re: Macbook A1466 Maybe Q7180

No, wrong resistors are being measured.

Check the voltage on each side of R8363 and R8364. These are the local pull up resistors for these 2 lines.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

No, wrong resistors are being measured.

Check the voltage on each side of R8363 and R8364. These are the local pull up resistors for these 2 lines.

Its 0V.

Started checking all the Power Rails .


PPDCIN_G3H_ISOL PPDCIN_G3H Coming to 15.2V
PP5V_S4RS3 is 0V
PP5V_S0. is 0V
PP3V3_S4 is 0V
PP3v3_SUS is 0V
PP3v3_S3 is 0V
PP3v3_S0 is 0V
PP3V3_S4SW_SNS is 0V
PP3V3_S0SW_SSD is 0V


Didnt go further to the 1.8V and the other rails.

[mon2]

Re: Macbook A1466 Maybe Q7180

Check

PP3V42_G3H
PPBUS_G3H

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Check

PP3V42_G3H
PPBUS_G3H

PP3v42_g3h is 3.4
ppbus_g3h is 8.51.

SMC_RESET_L is 3.1V. Should'nt it be 3.4V.

[mon2]

Re: Macbook A1466 Maybe Q7180

Yes. Check the resistance to ground of this signal pin. No power during the resistance check.

Also confirm the resistance of R5100 pull up resistor.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Yes. Check the resistance to ground of this signal pin. No power during the resistance check.

Also confirm the resistance of R5100 pull up resistor.

Meter Set to 2k.

Red To Ground.

Checked at the J6100 Pin 12

Resistane Value is .464.

R5100

Pin 1 is 78.8 (Had to set the meter to 200k as was getting 1 in 2k mode)
Pin 2 is .464 (Meter in 2k Mode)

[mon2]

Re: Macbook A1466 Maybe Q7180

.464 = 464 ohms. That is a low resistance to ground for this signal line.

Someone is pulling down this line. It could be the SMC or something under the package or the reset ic at u5110.

Carefully flux and remove u5110 but note the pin #1 of the ic. If this IC is at fault, the resistance will be much higher.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

.464 = 464 ohms. That is a low resistance to ground for this signal line.

Someone is pulling down this line. It could be the SMC or something under the package or the reset ic at u5110.

Carefully flux and remove u5110 but note the pin #1 of the ic. If this IC is at fault, the resistance will be much higher.

Removed the U5110.Pin 1 has 237 ohms resistance

[mon2]

Re: Macbook A1466 Maybe Q7180

Pin #1 on the PCB pads after removal or on the ic while it is on your work table?

Pin #1 is the power to this reset ic. Confirm it. The voltage here should be 3v42.

What is the resistance to ground of pin #5?

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Pin #1 on the PCB pads after removal or on the ic while it is on your work table?

Pin #1 is the power to this reset ic. Confirm it. The voltage here should be 3v42.

What is the resistance to ground of pin #5?

Pin1 on the PCB Pad after removal of the IC.
Voltage at Pin 1 is 3.42V. PP3V42 is fine since i am getting a magsafe light.

Resistance to ground on Pin#5 pcb pad after ic removal is 474 ohms.

I can see flux paste around the SMC. Someone might have tried to give some heat.

[mon2]

Re: Macbook A1466 Maybe Q7180

Your SMC appears to be partially working based on ppbus_g3h voltage.

Suggest to carefully flux and reflow the SMC.

Then allow it to cool and check the resistance of this signal line again.

If all is well, the resistance will be higher.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Your SMC appears to be partially working based on ppbus_g3h voltage.

Suggest to carefully flux and reflow the SMC.

Then allow it to cool and check the resistance of this signal line again.

If all is well, the resistance will be higher.

Yes. Let me do it tomorrow and and check.
Thanks a ton for this help.

[dellxps15]

Re: Macbook A1466 Maybe Q7180

problem to 50% loading bar:
1st try: go on recovery mode and do an sos on the ssd.
2nd try if first doesnt work: clkean me in bios with a good working dump; replace the serial number and validation checksum.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

problem to 50% loading bar:
1st try: go on recovery mode and do an sos on the ssd.
2nd try if first doesnt work: clkean me in bios with a good working dump; replace the serial number and validation checksum.

Did an SMC Reflow. Still its the same. Resistance of SMC_RESET_L is low.

SMC and U5110 bot have been removed and reballed.

It isnt going to the Recovery Mode
I guess BIOS flashing is the only option left. Or something else needs to be done?

[mon2]

Re: Macbook A1466 Maybe Q7180

Review this and continue to update this thread:

https://www.it-tech.com.au/how-to-re...halfway-issue/

[dellxps15]

Re: Macbook A1466 Maybe Q7180

Did an SMC Reflow. Still its the same. Resistance of SMC_RESET_L is low.

SMC and U5110 bot have been removed and reballed.

It isnt going to the Recovery Mode
I guess BIOS flashing is the only option left. Or something else needs to be done?

no recovery because of some error or what ? u can use usb windows pc keyboard and pressing windowskey+alt+r to enter recovery. if that doesnt work just keep pressing R on boot just after u give power to the board.

there was no need to reball - reflow smc since board was booting, but if u reballed it right then now we know smc is perfect.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

no recovery because of some error or what ? u can use usb windows pc keyboard and pressing windowskey+alt+r to enter recovery. if that doesnt work just keep pressing R on boot just after u give power to the board.

there was no need to reball - reflow smc since board was booting, but if u reballed it right then now we know smc is perfect.

If i press Command + R it goes off instantly. Doesn't even show the loading bar.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Review this and continue to update this thread:

https://www.it-tech.com.au/how-to-re...halfway-issue/

Let me check. But this is for a slow Macbok. Mine turns off after loading 50%.

I have re-installed the BIOS as well. Still the same.

[Instafixx]

Re: Macbook A1466 Maybe Q7180

Review this and continue to update this thread:

https://www.it-tech.com.au/how-to-re...halfway-issue/

As per this Link,
I do not have PP5V_S0 at all. No point touching the q1920