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From here it appeared u was shorted and may be u I finally could get to check the rails you suggested. Most Helpful Newest Oldest. The high performance electronics repair kit. Show 1 more comment.

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Fluctuation on dc in voltages is usually a nightmare to solve. After my initial failure of getting an answer, I had followed another discussion forum where it was suggested to measure voltages as mentioned in my last post. I have an issue where batter doesn’t get recognized, won’t charge no orange light. I tend to agree with you that there is an issue between u and SMC. Add your answer Durga Mahapatra will be eternally grateful. The high performance electronics repair kit.

SOLVED: Dead MacBook Pro – No SMC reset and no charging – Mac book pro 13″ – iFixit

There is no fluctuation on the DC in voltage. DCin board is ok with all voltages intact. Advertised prices and available quantities are subject to change without notice. I don’t know whether you can get anything from here. An update on this.


I have the following data as well. Shaunt Nalbantian shanto83 Rep: I had the same problem and thought u to be faulty. While we try to make sure that all prices posted here are accurate at all times, we cannot be responsible for typographical and other errors that may appear on the site.

But I have problem is locating S5 power rail. All 10 25 50 U77000 are some data that with 65W magsafe adpter connected. I was trying to locate u which in the schematics is shown to generate 5V and 3.

In connection with your transaction, we may acquire information about you as described in this notice, which we handle as stated in this notice. I finally could get to check the rails you suggested. But then realized that it U70000 as shown is a part of u!

If you can tell me where to measure the rail voltage I have the circuit schematics I can possible do that.

A and D DA-U7000

I was then suggested to try and check u77000 voltage rails instead. I had earlier tried to locate the U chip and measured voltages around that and had asked experts to help me on this. Our website resides behind a firewall and uses SSL Secure Sockets Layer, the industry-standard security protocol used to communicate with browsers to transmit personal information. Every car is hand-selected, inspected, and passes U700 emissions tests before making it out on the lot.


I don’t think that is correct. Give a list of all the power rails and it will be easier for us to give you advice. Hi Reece, thanks for your suggestion. Q looks like non-functional voltages at all pins fluctuating betn 2. Ordered U and U and few more chips and am waiting for those to arrive. We make every effort to provide you the most accurate, up-to-the-minute information; however, it is your responsibility to verify with the Dealer that all details listed are accurate.

I have now managed to get a board view file and the circuit schematics. It will take too long for us to go through all of the pins you have said.