Macbook 12 in a1534 (2016)no power - need help

[justin35]

It came in dead, no nothing... it gets warm if i plug in usb c charger...
I have an usb c meter which indicates like this when i power the laptop trough it:
5v 0.1 amps for a split of second
Then 14.3v and 0.35amps for 5 seconds
Then 14.3v and 0.55 amps and it remains like this.
I didn't take it apart yet... i don't know motherboard number

Any suggestion?
Thanks!!!

[piernov]

Re: Macbook 12 in a1534 (2016)no power - need help

Deadcpubook 12"

[justin35]

Re: Macbook 12 in a1534 (2016)no power - need help

Omg! That's sad news for custommer
Btw how do you diagnose if it has a dead cpu if you donn't have usb c meter?

Thanks piernov!!

[piernov]

Re: Macbook 12 in a1534 (2016)no power - need help

Well, A1534 always have dead CPU…
Typical issue is that it "turns on" (touchad "clicks" with forcetouch) CPU warms up, but there's nothing on the screen, no activity at all. Another issue is artifacts on the screen, random crash/reboot, SSD not recognized…

For data recovery only, you can try giving some heat to the CPU (200°C, 1min30s or something like that), it may make it work again for a short while so that you can save data.

[justin35]

Re: Macbook 12 in a1534 (2016)no power - need help

Thanks again piernov for the info!
I will take apart the laptop just to check cpuvcore short to ground.
Then i'll inform customer and see what's his choice.

[justin35]

Re: Macbook 12 in a1534 (2016)no power - need help

What is correct voltage and aperage drawn by a good working board?
Should it be 20v or 14.7v on the usbc meter?

Ps: i attached some pictures of the motherboard i pulled out... looks like liquid damage on the back all the way arround the edges...

[KvnTM]

Re: Macbook 12 in a1534 (2016)no power - need help

What is correct voltage and aperage drawn by a good working board?
Should it be 20v or 14.7v on the usbc meter?

Ps: i attached some pictures of the motherboard i pulled out... looks like liquid damage on the back all the way arround the edges...

It kinda does look like water damage. Is there no corrosion on the board?
USB-C Should jump from 5v to around 20v.

Check U4700. This chip is a common failure point of this macbook.

EDIT: Are you sure that it doesn't turn on? There is no chime or power led on these machines. Maybe the backlight is dead. Shine a flashlight on the screen and take a look. Also does it react to caps lock? Not sure but I think these still have the little green led inside the key.

[piernov]

Re: Macbook 12 in a1534 (2016)no power - need help

A1534 will work on 14.5V from the USB-C charger.
U4700 is on the 2015 model (820-00045), not the 2016 model (820-00244).
From the "Then 14.3v and 0.55 amps and it remains like this." statement, this does turn on and even CPU VCore is present. But most likely not POSTing.

[justin35]

Re: Macbook 12 in a1534 (2016)no power - need help

Well after cleaning the board with alcohol the machine works.
It takes 14.7v and reaches 0.8-0.9amps
But i ran into different problems...
It shows 0% battery after 5seconds you plug in the charger...also it plays iphone charger detection sound.
And it doesn’t see internal hard drive (question mark folder)
As far as i saw on google no ssd means dead cpu???

Thanks again everyone!!!

EDIT:
Now The green led on pcb is on when i plug in charger.
Board is 820-00045a

[KvnTM]

Re: Macbook 12 in a1534 (2016)no power - need help

A1534 will work on 14.5V from the USB-C charger.
U4700 is on the 2015 model (820-00045), not the 2016 model (820-00244).
From the "Then 14.3v and 0.55 amps and it remains like this." statement, this does turn on and even CPU VCore is present. But most likely not POSTing.

Thanks for correcting me on that one

Well after cleaning the board with alcohol the machine works.
It takes 14.7v and reaches 0.8-0.9amps
But i ran into different problems...
It shows 0% battery after 5seconds you plug in the charger...also it plays iphone charger detection sound.
And it doesn’t see internal hard drive (question mark folder)
As far as i saw on google no ssd means dead cpu???

Thanks again everyone!!!

EDIT:
Now The green led on pcb is on when i plug in charger.
Board is 820-00045a

Do you have access to an ultrasonic cleaner? Maybe there is some nasty stuff under a chip.
Since you don't only have problems with the SSD there might be something else.

[justin35]

Re: Macbook 12 in a1534 (2016)no power - need help

I do have ultrasonic bath but no ultrasonic cleaner solution
I'll order some tomorrow.
Thanks!