16 hold switch, 17 speaker, 18 power-button board – Dell Vostro 3550 (Early 2011) User Manual
Page 5: 19 quick launch button board, 20 coin-cell battery, 21 heat sink, 22 processor, 23 display assembly, 24 display bezel

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Removing The Power-Button Board
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Installing The Power-Button Board
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19 Quick Launch Button Board.................................................................59
Removing The Quick-Launch Button Board
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Installing The Quick Launch Button Board
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Removing The Coin-Cell Battery
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Installing The Coin-Cell Battery
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Installing The Display Assembly
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