Notes
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Repairing Power Mac G4 Quicksilver Central Processing Unit
Removing graphics (video) card is not necessary. Also, removing the clips which retain heat-sink can be accomplished by using a flat-blade (-) screwdriver to carefully pry them from the finned aluminum assembly. Other than these two suggestions, guide is succinct and accurate.
Apple Studio Display M2454 Teardown
This model is also known as the Apple Studio Display 15" LCD.