820-00244 from Macbook 12" No SSD

[2click]

Hi I want to know how to troubleshoot this logic board, because I don't know where to start... It doesn't recognize the SSD. Any advice on how to proceed?... Thanks!

 

[2informaticos]

Most likely waste of time.
A1534 boards are recognized for CPU and SSD issues.
You can check for all SSD power rails at least.
Some videos available on Internet...

 

[2click]

I know you've already told me its a waste of time, but I feel like it could be a good thing to learn a little bit what can I do when I get those boards.... Can you please help me a little with it? Thanks in advance

 

[2click]

And it will be a good practice even if it doesn't work because I am new to all this...

 

[2informaticos]

Look at schematic and try to locate all power supplies related with SSD.
Check if all get voltage.

 

[dukefawks]

Bad CPU is most cases. Heat up CPU and usually they work again for a few weeks. But as said, these 12" machines are hopeless.

 

[2click]

Even for the NO SSD the cpu is the problem?? Should I give it a reflow and try?? What temperature do you recommend me to use?

 

[2informaticos]

"Some videos available on Internet..."
SSD connects with CPU (PCH).

 

[dukefawks]

PCI-E lines to SSD go to CPU. Just heat up the CPU to 120C-150C, no need to reflow as the problem is inside the CPU.

 

[2click]

I used an external USB and load the OS, it worked fine, does that means still I have nothing to do to it? I heated the cpu for around 4 min with my heat station to 140C, still doesn't recognize the ssd. Any suggestions? Thanks

 

[2informaticos]

140 at hot air control, you've may got 50 degrees on CPU die...
Don't you think why set it to 450 to melt 220 solders???

 

[2click]

I am really trying to learn around here, if this is not the place for me to learn, I would be happy to keep my money on my pocket... Now if you please help me understand so I don't burn the CPU I would really appreciate it. Should I use 450C ? should I leave the heat on one place or should I move it around the CPU? Thank you...

 

[2informaticos]

You should set air station at 350-400 and 1/3 air flow probably, and move it in circle 2-3 cm above CPU die; 10-15s should be good enough.
The settings depend of each station.
You can play with distance and air flow, more than the temp setting.

You should practice on scrap boards.
Is not good idea to crack CPU die on a client board.

 

[2click]

Thank you, I will be doing that to see what temperature to use with my hot air station... I?ll let you know how it goes... and sorry for being a pain in the ass... but I just want to practice and learn... I?ve been reading posts where you say to not inject voltage on system side on ppbus_g3h, but haven't found the correct way to do it. Can you please send me a link where I can read about that? Thanks again....

 

[2informaticos]

I NEVER said that.
I always said do NOT inject on PPBUS_G3H, BEFORE testing for shorted high-side MOSFET...