Lenovo ThinkCentre M90p - Replacing the System Board

15.Reinstalltheharddiskdrive.See“Replacingtheharddiskdrive”onpage84.
16.Reconnecttheheatsinkandfanassemblycabletothemicroprocessorfanconnectoronthesystem
board.
17.Goto“Completingthepartsreplacement”onpage93.
Replacingthesystemboard
Attention
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafetyinformation”
intheThinkCentreSafetyandWarrantyGuidethatcamewithyourcomputer.ToobtainacopyoftheThinkCentre
SafetyandWarrantyGuide,goto:http://www.lenovo.com/support
Thissectionprovidesinstructionsonhowtoreplacethesystemboard.
CAUTION:
Theheatsinkandmicroprocessormightbeveryhot.Turnoffthecomputerandwait
threetoveminutestoletthecomputercoolbeforeopeningthecomputercover.
Toreplacethesystemboard:
1.Openthecomputercover.See“Openingthecomputercover”onpage68.
2.Pivotthedrivebayassemblyupwardtogainaccesstothesystemboard.
3.Removetheharddiskdrive.See“Replacingtheharddiskdrive”onpage84.
4.RemoveallmemorymodulesandPCIcardsthatarecurrentlyinstalled.See“Replacingamemory
module”onpage73and“ReplacingaPCIcard”onpage74.
5.Carefullytakenoteofthelocationofallcableconnectionsonthesystemboardanddisconnectallthe
cables.See“Locatingpartsonthesystemboard”onpage70.
6.Removetheheatsinkandfanassemblyfromthefailingsystemboard.See“Replacingtheheatsink”
onpage78.
7.Carefullyslidethesystemboardsothatitcanbereleasedfromthefourmountingstudsthatsecure
thesystemboardinplace.
8.Liftthesystemboardoutofthechassis.
9.Removethemicroprocessorfromthefailingsystemboardandinstallitonthenewsystemboard.
See“Replacingthemicroprocessor”onpage79.
10.Installthenewsystemboardintothechassisbyaligningthefourmountingstudsinthechassiswith
thecorrespondingholesonthenewsystemboard,andthencarefullyslidethenewsystemboardinto
thechassisuntilitissecuredinplacebythefourmountingstuds.
11.Installallmemorymodulesandadaptercardsremovedfromthefailingsystemboardonthenew
systemboard.
12.Installtheheatsinkandfanassemblyandconnecttheheatsinkandfanassemblycabletothenew
systemboard.See“Replacingtheheatsink”onpage78.
13.Reinstalltheharddiskdrive.See“Replacingtheharddiskdrive”onpage84.
14.Reconnectallremainingcablestothesystemboard.See“Locatingpartsonthesystemboard”
onpage70.
15.Goto“Completingthepartsreplacement”onpage93.
Thefailingsystemboardmustbereturnedwithamicroprocessorsocketcovertoprotectthepinsduring
shippingandhandling.
82ThinkCentreHardwareMaintenanceManual