![mac a1418 service manual mac a1418 service manual](https://newjerseypdf.weebly.com/uploads/1/2/4/7/124715698/490300898.jpg)
These components are the power supplies of each part of the board, if one power rail is down then it can prevent the laptop from working.
![mac a1418 service manual mac a1418 service manual](https://www.macupgrades.co.uk/store/images/Machines/serial/imac21-17-4k.jpg)
Does your laptop have any issue with the disply, or the power? Start with the basics by measuring the voltage at all the measuring points showed in the repair guide, and come back with all the measures so we can help you fix your iMac 21.5-Inch Core i7 3.1 A1418. Depending on the problem it won't be the same approach.
![mac a1418 service manual mac a1418 service manual](https://elektrotanya.com/PREVIEWS/94576954/23432455/apple/apple_m8536.pdf_1.png)
Don't jump into the repair book and chip level right away.