Lenovo IdeaCentre C540, Hardware Maintenance Manual, Page: 31 / 69

Identifying parts on the motherboard
The motherboard (sometimes called the planar or system board) is the main circuit board in your computer.
It provides basic computing functions and supports a variety of devices that are factory-installed or that
you can install later. The following illustration shows the location of connectors and components on the
front of the motherboard.
1 2
3
6
7
8
9 1 0 1 1 1 2 1 3 1 4
1 5
1 6
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
4
4
5
1. Thermal sensor header 13. TV-Tuner card connector
2. CPU and socket 14. Rear I/O module connector
3. Memory connector
15. DC-in connector
4. USB connectors 16. B-Case card connector
5. Headphone connector 17. Converter board connector
6. Microphone connector 18. Hard disk drive SATA connector
7. Memory card connector 19. Hard disk drive power connector
8. Speaker connector 20. Optical drive SATA connector
9. Power switch board connector 21. Optical driver power connector
10. Wi-Fi card connector
22. LVDS connector
11. Front control board connector 23. Camera connector
12. Battery 24. System fan connector
Chapter 7
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Locating connectors, controls and components
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