HP ZBook 15 G5 Base Model Mobile Workstation User Manual Page 155
- Page / 203
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
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Defective fan; out-of-date BIOS.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 ow.
Troubleshooting steps
General actions
1. Update BIOS and drivers (4. Update BIOS and drivers on page 91) 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 100). 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, n, or vent.
c. Test fan using HP PC Hardware Diagnostics (UEFI) tool (6. HP Hardware
Diagnostics and Tools on page 92). Be sure that the fan is not producing loud
noise and that fan blades spin correctly.
d. Test with a veried 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, n/ muer, and thermal grease.
Fan replacement requires reboot and fan function verication using HP PC Hardware
Diagnostics (UEFI) tool.
Common issues and possible solutions 143
- Maintenance and Service Guide 1
- Safety warning notice 3
- Table of contents 5
- 1 Product description 13
- 2 Components 20
- 10 Chapter 2 Components 22
- 12 Chapter 2 Components 24
- Keyboard area 25
- 14 Chapter 2 Components 26
- Keyboard area 15 27
- 16 Chapter 2 Components 28
- Keyboard area 17 29
- Special keys 30
- Action keys 31
- 20 Chapter 2 Components 32
- To use a hot key: 33
- Keyboard area 21 33
- 22 Chapter 2 Components 34
- Cover 23 35
- Labels 25 37
- 3 Illustrated parts catalog 38
- Computer major components 27 39
- Bracket Kit 43
- Cable Kit 44
- Plastics Kit 45
- Mass storage devices 46
- Miscellaneous parts 47
- Component Spare part number 48
- Screw Kit L28720-001 48
- Tools required 49
- Service considerations 49
- Drive handling 50
- Workstation guidelines 51
- Equipment guidelines 52
- Customer Self-Repair parts 53
- Description Spare part number 55
- Solid-state drive (M.2) 56
- Hard drive 57
- WWAN module 59
- WLAN module 61
- Memory module 62
- Keyboard 65
- Bottom cover 67
- TouchPad module 69
- NFC module 72
- Heat sink assembly 76
- System board 78
- RTC battery 82
- Speakers 86
- Fingerprint reader board 87
- Power button board 89
- Display assembly 90
- 7 Troubleshooting guide 98
- Resources 99
- General troubleshooting steps 99
- Identify the issue 100
- 2. Examine the environment 102
- Analyze the issue 103
- Table 7-5 Boot-error codes 109
- Resolve the issue 112
- Verify solution 116
- Helpful Hints 117
- Power-on issues 118
- Consulting with HP Service 118
- AC adapter issue 121
- Battery discharges too fast 123
- Burnt smell 124
- No video (with power) 124
- Blinking lights 125
- Diagnostics error messages 126
- Performance (OS) 127
- Intermittent shutdown 128
- Blue screen 129
- No wake up 133
- Unresponsive 134
- Slow performance 134
- Incorrect time and date 135
- Display anomalies 136
- Dead pixel 137
- Vertical lines 137
- Horizontal lines 137
- No video (internal) 138
- No video (external) 139
- DisplayPort/VGA 139
- Touch screen 141
- I/O devices 142
- Keyboard point stick 143
- Keyboard backlight 143
- TouchPad 144
- Smart card reader 148
- Thunderbolt (TB) 150
- Read-write error 153
- Blue screen (BSOD) error 153
- Noisy hard drive 154
- Mechanical 155
- Noise (sound) 156
- Fan runs constantly 157
- Thermal shutdown (hot) 158
- Stuck power button 158
- Additional information 159
- Processor not executing code 160
- Memory module error 160
- Failure - System Board Error 161
- Additional information 151 163
- Error message list 164
- Bug check symbolic names 164
- Use Windows Debugging Tool 165
- 6. Open the crash dump le 168
- Lookup for Bug Check 0xC2 169
- Additional information 157 169
- Cable management 171
- Connector types 172
- Using Computer Setup 174
- Updating the BIOS 175
- Downloading a BIOS update 176
- Using Windows tools 179
- Restore and recovery 180
- (select products only) 184
- 11 Specications 186
- Hard drive specications 187
- 500 GB* 750 GB* 188
- Nonvolatile memory usage 195
- Questions and answers 197
- 14 Recycling 199
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