Macbook Pro Mid 2012 bad fuse?-Charity $$$ reward

[Gae235]

Re: Macbook Pro Mid 2012 bad fuse?-Charity $$$ reward

I will read this post with carefully cause i have a problem with my macbook pro.
only a little green and orange blinking led on the magsafe

[MobileXT]

Re: Macbook Pro Mid 2012 bad fuse?-Charity $$$ reward

I will read this post with carefully cause i have a problem with my macbook pro.
only a little green and orange blinking led on the magsafe

check your PPP3v42_G3H power rail. follow the trace.

[josemedeiros007]

Re: Macbook Pro Mid 2012 bad fuse?-Charity $$$ reward

Hello, thanks for reading this!

I have a macbook pro mid 2012 13 inch that is completely dead, magsafe charger plugged in- sometimes green light, sometimes nothing. I purchased this computer already broken, the person said (they often lie, but I believe him) that he tried to upgrade the HDD himself and when he put it together, the computer was dead.

The board is very clean, no water damage (I have worked on hundreds of water damaged boards, so I believe I am quite good at spotting the tiniest corrosion) This leads me to believe that he shorted something when working on it, prob with his screwdriver.

The battery is completely shot, I put it in a working pro and it does not charge, it only has 0.15V on it, which again leads me to believe that it was shorted. I even took this board and put it in my working late 2011, no life, and vice versa (put the working 2011 board in this computer, everything was working but it was slow as hell- I believe this is because the temp sensors are not cross-compatible)

What I know:
The board has 2 fuses on it, one of which is on the magsafe port (I changed the whole magsafe port, so that is not it). But I found some conflicting information as to where the main fuse is. Most of the threads are on older macbooks, so they may not necessarily apply.

The battery is good (i put in a new, working battery)
My charger is good
The magsafe DC board is good

What I do not know:
how to read the schematics (sorry)
how to diagnose the board properly
what to do next?

I tried to check some parts that I suspect are the fuse with my multimeter continuity function, I attached a picture with a board and what I measured. These are based on previous threads about older macbooks.

On pics:
no 1: OK (multimeter goes to 0)
2:OK
3:No reaction (Multimeter stays at 1)
4: OK
5: OK

These are based on some info from the net, some say the fuse is (was) near the display cable, some say it is down near the battery plug, or on the other side next to where magsafe DC plugs in.

To make this slightly more interesting and maybe to motivate people to help even a noob like myself, I decided to add a little twist: If you help me and we do get the board working, I will donate $100 to a charity or nonprofit of your choosing.

I was going to take the computer to an Apple store for diagnostics, but I would prefer to fix it myself. (out of warranty)

So as a courtesy to others following this thread, that I just found in a Google search, what component failed, and how did you fix your issue? Did you make a You tube video, or do you pictures of what you repaired? What really irritates me is people that ask me for help, I try and do my best to help them with their issue, then they never let you know if they fixed it or not or what solved the problem.

Regards, Jose F. Medeiros
408-256-0649