Lenovo IdeaCentre B550 All-in-One User Manual Page 50

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Step10.Removethe8screwsthatsecuretheheat-sinktothemotherboard,andthenliftuptheheat-sink
toremoveit.
Step11.Toinstallthenewheat-sink:
a.Lineupthenewheat-sinkwithmountingholesonmotherboardandsecureitwiththe8screws.
Step12.Reattachthesystemfan,EMIcover,middlecover,opticaldrive,computerstandandtherearcover.
ReplacingtheCPU
Note:Turnoffthecomputerandwait3to5minutestoletitcooldownbeforeremovingthecover.
ToreplacetheCPU
Step1.Removeanymedia(disks,CDs,DVDs,ormemorycards)fromthedrives,shutdowntheoperating
system,andturnoffthecomputerandallattacheddevices.
Step2.Unplugallpowercordsfromelectricaloutlets.
Step3.Disconnectallcablesattachedtothecomputer.Thisincludespowercords,input/output(I/O)
cables,andanyothercablesthatareconnectedtothecomputer.Referto“Leftandrightview”
and“Rearview”forhelpwithlocatingthevariousconnectors.
Step4.Removetherearcover.Referto“Removingtherearcover”.
Step5.Removethecomputerstand.Referto“Removingthecomputerstand” .
Step6.Removetheopticaldrive.Referto“Replacingtheopticaldrive” .
Step7.Removethemiddlecover.Referto“Removingthemiddlecover”.
Step8.RemovetheEMIcover.Referto“RemovingtheEMIcover”.
Step9.Removethesystemfans.Referto“Replacingthesystemfans” .
Step10.Removetheheat-sink.Referto“Replacingtheheat-sink” .
Step11.Liftthesmallhandleandopentheretainer.
Attention:Donottouchthegoldcontactsonthebottomofthemicroprocessor.Whenhandingthe
microprocessor,touchonlythesides.
44IdeaCentreB550–B555HardwareMaintenanceManual
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