Lenovo IdeaCentre B550 Hardware Maintenance Manual page 32

Identifying parts on the B555 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. CPU Socket
2. Front indicator board
3. Speaker connector
4. RJ45 connector
5. USB 2.0 connectors (2)
6. USB 3.0 connectors (2)
7. HDMI-in/out connectors
8. Mini PCI connector
9. Touch control board connector
10. Front function board connector
11. B-CAS connector
12. Power board connector
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IdeaCentre B550–B555Hardware Maintenance Manual
13. Mini PCI connector
14. TBD
15. Converter board connector
16. Motherboard power connector 1
17. e-SATA connector
18. e-SATA connector
19. Camera connector
20. LVDS connector
21. e-SATA connector
22. e-SATA connector
23. System fan connector 1
24. Motherboard power connector 2