HP 431311-001 6520s 6720s 6735s 5VDC 0.22A 3-wire Fan | HY60G-05A 6033B0006301 | 6520s | Team Spares
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Amazon.com: DBTLAP Laptop CPU Fan Compatible for HP Compatible for Compaq 6720s 6730s 6820s 6735s 6830 431311-001 443912-001 6530s 6535s 6043B0024701 540 541 550 456605-001 431312-001 CPU Fan : Electronics
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Full detail on how to replace the Keyboard and clean the CPU fan on an HP Compaq 6720s Laptop - YouTube
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