Fan Runs Constantly - HP ZBook Power G10 Maintenance And Service Manual

Table 6-51 Issues, possible causes, and fixes (continued)
Items
Noisy fan
Noisy hard drive
Noisy optical drive
Noisy speaker
Noisy display
The section below is intended for authorized service providers and technicians.

Fan runs constantly

Use this information to troubleshoot a constantly running fan.
Table 6-52 Issues, possible causes, and fixes
Items
Symptoms
● Fan never stops running
● Generates heat
Decreased computer
●
performance
Procedures
Determine whether the noise comes from the fan. Disconnect the fan briefly to isolate
whether noise originates from fan. If noise is absent with fan disconnected, see
runs constantly on page 125.
Determine whether the noise comes from the hard drive.
See Noisy hard drive on page
1. Determine whether the noise comes from an optical drive.
2. Remove CD/DVD from the optical drive.
1. Determine whether the noise comes from speaker.
2. Test with a verified working external headset/speaker.
Determine whether the noise comes from display panel (humming noise). Change
display frequency settings. See
1. After disassembling the chassis, inspect components of the interior for excessive
wear or damage.
2. If noise issues persist, proceed with process of elimination for battery, AC adapter,
or boards.
Procedures
Possible causes
● BIOS not up to date.
● Thermal condition (fan, air flow)—fan might not be defective but must run constantly
to remove excess heat generated by electrical components.
● Inappropriate configuration.
Troubleshooting steps
General actions
1. Verify whether BIOS is set to Fan Always on while on AC Power F10 Setup. When
booting the computer, press
Device Options Menu.
2. Update BIOS and drivers
to default. BIOS can implement new fan characteristics and updates for other
components.
3. Perform a hard reset (8. Hard reset on page
recorded thermal values in memory.
123.
Display on page 105.
f10 to open Setup, and then select Advanced > Built-In
(4. Update BIOS and drivers on page
79). Performing a hard reset can reset
Fan runs constantly
Fan
73) and reset BIOS
125