Openboardview.org is a site providing links to multiple versions of OpenBoardView. This opensource software runs without installing on Windows (EXE) and provides schematics for most popular motherboards and circuit boards. It's interactive, allowing a user to select a component and identifying it's respective connections.
Most times when Apple hardware breaks, it's generally a trip to the Genius Bar or an authorized Apple Repair location. However, Apple severely restricts what can be repaired onsite due to intentionally restricting spare parts. Additionally, the experience typically costs the same as when purchased new to fix. Rossmann Repair Group in Manhattan, NY bypasses all of this, providing excellent service, expert troubleshooting diagnostic and capable of repairing anything on-board. They also resell all of their high-end soldering equipment and supplies at store.rossmanngroup.com.