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    Information regarding recent vulnerabilities

    HP is aware of the recent class of vulnerabilities referred to as “speculative execution side-channel attacks”. HP has released a security bulletin for systems with Intel x86 processor, and will continue to provide more information on other processors (ARM, AMD) as it becomes available. 

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HP Compaq dc7800 Convertible Minitower PC - Removing and Replacing the System fan

This document pertains only to HP Compaq dc7800 Convertible Minitower PCs with the following case design:
Before you begin
  • Turn off the computer, and then disconnect all cables. Disconnect the Ethernet or modem cable before disconnecting the power cord.
  • Move the computer to a clear, flat, stable work surface over a non-carpeted floor.
  • HP strongly recommends the use of an anti-static wrist strap and a conductive foam pad when working on the computer.
  • Do not remove a component from its protective packaging until you are ready to install it.
  warning:
The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
  caution:
This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
Video overview (in English)
To view a video demonstrating the procedure for removing the system fan, right-click System fan removal video and select Open link in new window/tab.
Replacement part information
The following HP part numbers are known to be compatible with this system:
  note:
Part numbers are subject to change.
Description
Part Number
Requires Return
Chassis fan bracket
450710-001 (modified)
No
* If a part is listed as "Yes" under "Requires Return" then the defective part needs to be returned to HP. For more information about returning parts to HP select one of the links below:
  note:
For customers in countries/regions with RoHS legislation* (e.g. EU, China, etc.) restricting the use of hazardous substances in electrical equipment. The use of the Original Spare part is regulated by RoHS legislation. If your unit contains a part that is labelled with the Modified Spare number, the Modified Spare must be ordered as the replacement part. If your unit contains a part that is labelled with the Original Spare number, please order the Original Spare as the replacement part. In this case either the Original Spare or the Modified Spare may be shipped which will not affect performance or functionality of the unit.
System fan removal
  caution:
Review the following safety considerations before performing the following steps. Failure to comply with these safety considerations could result in damage to the product.
Step 1
With all cables disconnected from the computer, remove the access panel.
Step 2
Disconnect the fan cable from the system board.
Step 3
Push on the tabs to release the top of the fan holder from the chassis.
Step 4
Rotate the fan holder away from the chassis wall.
Step 5
Lift the fan out of the chassis.
Step 6
Pull out on the tabs on the fan holder and lift the fan out of the holder.
System fan replacement
Step 1
Align the air flow arrows on the fan and the fan holder.
  note:
The fan must be installed in the correct orientation for proper air cooling.
Step 2
Press the fan into the fan holder until it snaps into place.
Step 3
Insert the bottom tabs on the fan holder into the slots on the chassis.
Step 4
Press the fan holder against the chassis until the top tabs snap into the chassis slots.
Step 5
Connect the fan cable to the system board.
Step 6
Replace the access panel.

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