HP Z400 Maintenance And Service Manual page 151

8.
Remove the cold plate assembly.
a. Slowly and evenly loosen one pair of diagonally opposite screws (1) on the LCS cold plate
assembly until the screw shanks disengage from the system board, and then loosen the
remaining pair (2), as shown below.
Figure 5-64
b.
Lift the cold plate assembly from the CPU, and then remove the entire LCS unit from the
system.
ENWW
Loosening the LCS cold plate screws in sequence
Removing and installing components
139