Lenovo ThinkCentre A70z - Replacing the System Board; Removing the System Board

a.Partiallyinstallscrew1,fullyinstallscrew3,andthenfullyinstallscrew1.
b.Partiallyinstallscrew2,fullyinstallscrew4,andthenfullyinstallscrew2.
7.Closethesystemboardshielding.See“Closingthesystemboardshielding”onpage72.
8.Goto“CompletingtheFRUinstallation”onpage108.
Replacingthesystemboard
Thissectionprovidesinstructionsonhowtoreplacethesystemboard.
CAUTION:
Themicroprocessorandheatsinkassemblymightbeveryhot.Turnoffthecomputer
andwaitthreetoveminutestoletthecomputercoolbeforeopeningthecomputercover.
Attention
Donotopenyourcomputerorattemptanyrepairbeforereadingandunderstandingthe“Importantsafety
information”intheThinkCentreSafetyandWarrantyGuidethatcamewithyourcomputer.Toobtainacopy
oftheThinkCentreSafetyandWarrantyGuide,goto:
http://www.lenovo.com/support
Removingthesystemboard
Toremovethesystemboard,dothefollowing:
1.Turnoffthecomputer.
2.Disconnectallcables,powercords,andexternaloptionsfromyourcomputer.See“Rearconnectors”
onpage65.
88ThinkCentreHardwareMaintenanceManual