Re: MacBook Pro 15" 2012 dead
Edit:
Seems like I was too joyful a bit too early. Today Macbook is still not charging and no magsafe lights. Tho it is working from battery. Somehow Macbook powered on from magsafe after replacing 625 chip and started to charge battery (amber light on magsafe) and it got it full. After that magsafe went green. Unfortunately after couple of hours there were no magsafe green anymore but it remained working on battery. I tried SMC reset but no luck this time. I tried other working Magsafe charger and even other working Magsafe DC board...
e.salmus
Member
Last Activity: 03-15-2015, 04:10 AM
Joined: 12-16-2014
Location: Tallinn
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Re: MacBook Pro 15" 2012 dead
It has been a while now. I wanted to let you know that I managed to get my laptop working. I replaced that 6259ahrtz again (seems like that my replaced chip was faulty after replacing it) and after resetting SMC, bang, magsafe LED started to glow bright green and after several seconds it started to charge battery and laptop powered up.
Success!
Thank you all for help.Leave a comment:
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Re: MacBook Pro 15" 2012 dead
It has 6259ahrtz
With battery:
1. 15.5V
2. 16.5V
3. 3.95V
4. 2.89V
5. 0.00V
6. 3.31V
7. 0.00V
8. 0.00V
9. 0.05V
10. 0.07V
11. 3.40V
12 3.41V
13. 3.38V
14. 0.03V
15. 0.00V
16. 0.00V
17. 0.38V
18. 5.52V (going lower) stopping at 0.56V
19. 5.48V
20. 5.49V
21. 0.00V
22. 0.00V
23. 3.82V (going lower) stopping at 0.56V
24. 3.51V (going lower) stopping at 0.56V
25. 5.20V
26. 7.96V
...Leave a comment:
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Re: MacBook Pro 15" 2012 dead
...and with or without battery?...Leave a comment:
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Re: MacBook Pro 15" 2012 dead
What do you mean? I have tried many Magsafe chargers and i also have tried other magsafe boards (with the same part number)....Leave a comment:
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Re: MacBook Pro 15" 2012 dead
I am running out of any ideas. Now Macbook is not powering on again, magsafe green light is very dim (it does not matter if battery is present or not). I did some measurements but it is quite hard to think of anything without proper schematics. I have A1278 820-3115 schematics and from there I have done some conclusions.
I think I found that geohot ic but i got 0V reading on any of those pins.
Please help me and ask for more measurements on certain points on the picture....Leave a comment:
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Re: MacBook Pro 15" 2012 dead
Small update.
I replaced IC 625 but voltages are same.
I disconnected battery and magsafe green light started to glow very dim and I get around 16V on main capacitor near that chip. I will do more measurements on that IC 625.Leave a comment:
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Re: MacBook Pro 15" 2012 dead
I noticed that there is 62882C what has same voltage on it as 625. That 62882C goes somwhat hot while laptop is powered on. I would say over 70 degree Celsius because I can't hold my finger on it....Leave a comment:
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Re: MacBook Pro 15" 2012 dead
It is hard to find that geohot ic. Please give me ideas, what it looks like, IC number? Do you mea G3hot IC?
Edit: I found that IC 625.
I measured with and without charger and battery present while computer turnd off.
Fom pin 1 I got 9.48 to ground
on pin 2 I got 9.87V to ground
On pin 3 I got 2.4V to ground
I think that chip has a problem...Last edited by e.salmus; 12-17-2014, 06:16 AM.Leave a comment:
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Re: MacBook Pro 15" 2012 dead
Thank you for reply.
Somehow today laptop powered on from battery but still no charging and no magsafe LED lights.
Fortunately I managed to measure voltage. Why I think magsafe is not powered on is because when there is no charger present then there is 9.82V on pins 1 and 2 on magsafe board. Center pin, 3. pin, has no voltage measured across ground. When I connect charger then I get 9.75V on pins 1 and 2. And i get 8.46V on pin 3 to ground. I think on 3. pin there has to be a lot less voltage
Any more advice?Leave a comment:
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MacBook Pro 15" 2012 dead
Hi folks!
I have an issue with MacBook Pro 15, mid-2012. For now, it is dead. It didn't get any liquid or fallings, just died in my arms.
My problems started like that:
When I connected charger then it didn't charge. No lights on Magsafe but remained working on battery.
Then I checked my charger on another MBP and it worked. I tried other charger on my MBP and still no lights on Magsafe nor charging.
Several minutes went by and MBP just died. Can't turn on and no activity.
I disassembled laptop and took out motherboard to start tracing the fault.... -
Re: New Members - please post your introductions here
Hi folks!
I am electonics student from Estonia. I work as IT-specialist and my hobby is electronics.
Best wishes
EdwardLeave a comment:
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