HP ZBook 15 G5 Base Model Mobile Workstation User Manual Page 100
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Identify the issue
1. Understand the issue
It is important to understand the issue that occurred, including related symptoms. It helps to understand the
basic computer boot-up sequence as well as the failure itself. The boot-up sequence and associated failures
are described below.
Boot up sequence
The computer performs several steps after you press the power button or restart the computer.
It is important to understand where in the boot-up sequence the symptoms occur. The following table lists
the phases of the boot-up sequence and explains the symptoms that may occur in each phase. For example, a
blue screen error (BSOD) often occurs during the performance phase.
Table 7-2 Boot-up sequence
Item Procedure
Power-on After power button is pressed, the computer boots after all internal power rails (i.e., 5V, 3.3V) are stable.
Conrm that power lights are on fan is spinning.
Next step: If the computer experiences a power-on issue, see “Verify Power Good (Troubleshooting) lights” in
No Power on page 106.
Common issues: all lights are o; troubleshooting lights are on; does not boot; video is absent.
POST (UEFI/BIOS) Power-On Self-Test (POST) veries that hardware components (processor, hard drive, memory, etc.) are
functional. When POST is complete, the HP logo displays briey and then disappears.
If there are errors, the computer may exhibit blinking lights and POST error messages
Common issues: lights blink, error message appears, hangs.
Performance
(operating system)
System boots to operating system, and Windows logo screen appears.
Common issues: hangs (lock up/freezes), blue screen, video distorted, driver conict, slow performance,
display issue (dead pixel), I/O issue (no speaker sound), wireless/audio unavailable, noise.
See Analyze the issue on page 91 table below for detailed troubleshooting information).
Failure classication
Failure classication is a breakdown of dierent types of failures and symptoms that could occur during the
boot-up sequence. Table 3 and table 4 represent the failure classication for common notebook failures.
Table 3 categorizes failures by the boot-up sequence.
1. Power-on: Common issues are No Power, Recycle/Reboot, etc.
2. POST: Common issues are No Boot (have power), Light Flash or Diagnostics Error.
3. Performance: Common issues are Intermittent Loss of Power, Blue Screen, Hang, etc. In many cases,
issues may be identied and associated with a particular hardware (i.e., display, storage).
Table 4 categorizes failures by hardware.
4. Display
5. I/O devices (Input/Output)
88 Chapter 7 Troubleshooting guide
- 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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