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4.20 Fan/Heat sink/CPU 4 Replacement Procedures
4. When silicon grease is already applied to the CPU or fin, wipe them off with a cloth
in advance.
5. Apply new grease (Shin-Etsu Chemical Co. X-23-7921-5) on the CPU using a special
syringe as shown in the following figure. Apply quarter of scale (0.25ml) of grease
evenly on the CPU chip.
PORTÉGÉ M780 Maintenance Manual (960-809) [CONFIDENTIAL] 4-57
Figure 4-35 Applying new grease
6. Place the fan on the heat sink and secure them with the following screws.
M2.54.0B FLAT HEAD screw 2
7. Set the fan hood in place.
CAUTION: Do not apply silicon grease on the North bridge.
8. Place the heat sink on the CPU and secure it with the following screws.
M2.04.0B BIND screw 4
9. Connect the fan cable to the connector CN3380 on the system board.
CAUTION: Do not put the fan cable on the fan.
Tighten the screws in the order of the number marked on the CPU hold plate.
Grease
CPU