HP ZBook 17 Maintenance and Service Guide - Page 159

Mechanical, Fan error message - 90B

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Mechanical Fan error message - 90B Items Procedures Symptoms Possible causes Fan error 90B at boot Defective fan; out-of-date BIOS. CAUTION: May lead to system ● shutdown, data loss or possible system damage. ● The system fan is not spinning or not spinning properly (loose connection, fan is stuck or defective). The temperature inside the case is too high, and the fan cannot spin fast enough to remove the heat due to an obstruction to air flow. Note Troubleshooting steps General actions 1. Update BIOS and drivers (4. Update BIOS and drivers on page 94) or reset BIOS to default. BIOS may implement new fan characteristics and updates for other components. 2. Perform a hard reset (8. Hard reset on page 102). Performing a hard reset can reset recorded thermal values in memory. Thermal-related issue 1. Verify thermal condition: a. Check fan and connection. Reseat fan cable. b. Be sure that no obstructions or dust are in heat sink fan, fin, or vent. c. Test fan using HP PC Hardware Diagnostics (UEFI) tool (6. HP Hardware Diagnostics and Tools on page 95). Be sure that the fan is not producing loud noise and that fan blades spin correctly. d. Test with a verified working fan. e. Remove old thermal compound and pads, and replace properly with new pads. 2. Verify thermal solution ▲ Use Thermal Monitor tool (available only to authorized service providers/ technicians) to run stress test (processor and GPU) and verify that thermal sensors are within limits after thermal condition is serviced. BIOS currently omits fan presence detection to shorten boot time delay less than four seconds. Therefore, the fan error is generated based on previous boot to operating system that found system fan error. Fan often is part of thermal solution, including heat sink, fin/ muffler, and thermal grease. Fan replacement requires reboot and fan function verification using HP PC Hardware Diagnostics (UEFI) tool. Common issues and possible solutions 145

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Mechanical
Fan error message - 90B
Items
Procedures
Symptoms
Fan error 90B at boot
CAUTION:
May lead to system
shutdown, data loss or possible system
damage.
Possible causes
Defective fan; out-of-date BIOS.
●
The system fan is not spinning or not spinning properly (loose connection, fan is stuck
or defective).
●
The temperature inside the case is too high, and the fan cannot spin fast enough to
remove the heat due to an obstruction to air
flow.
Troubleshooting steps
General actions
1.
Update BIOS and drivers (
4. Update BIOS and drivers
on page
94
) or reset BIOS to
default. BIOS may implement new fan characteristics and updates for other
components.
2.
Perform a hard reset (
8. Hard reset
on page
102
). Performing a hard reset can reset
recorded thermal values in memory.
Thermal-related issue
1.
Verify thermal condition:
a.
Check fan and connection. Reseat fan cable.
b.
Be sure that no obstructions or dust are in heat sink fan,
fin,
or vent.
c.
Test fan using HP PC Hardware Diagnostics (UEFI) tool (
6. HP Hardware
Diagnostics and Tools
on page
95
). Be sure that the fan is not producing loud
noise and that fan blades spin correctly.
d.
Test with a
verified
working fan.
e.
Remove old thermal compound and pads, and replace properly with new pads.
2.
Verify thermal solution
▲
Use Thermal Monitor tool (available only to authorized service providers/
technicians) to run stress test (processor and GPU) and verify that thermal
sensors are within limits after thermal condition is serviced.
Note
BIOS currently omits fan presence detection to shorten boot time delay less than four
seconds. Therefore, the fan error is generated based on previous boot to operating system
that found system fan error.
Fan often is part of thermal solution, including heat sink,
fin/
muffler,
and thermal grease.
Fan replacement requires reboot and fan function
verification
using HP PC Hardware
Diagnostics (UEFI) tool.
Common issues and possible solutions
145