HP ZBook 14u G4 Mobile Workstation Bedienungsanleitung Seite 145
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See Reducing Heat Inside the PC to Prevent Overheating.
Noise (sound)
Symptoms
Computer emits abnormal noise
Possible causes
Aside from basic components (power adapter/supply, fan, speaker, hard drive, display panel,
external devices), it is also common for electronic components to produce noise.
Troubleshooting steps
1. Inspect external power source and change to veried working one.
2. Determine whether the noise comes from AC power adapter. Test with a veried
working AC adapter.
Disconnect external devices and all cables connected to the computer to isolate issue to
computer only.
Noisy fan Determine whether the noise comes from the fan. Disconnect the fan briey to isolate
whether noise originates from fan. If noise is absent with fan disconnected, refer to Fan runs
constantly on page 134.
Noisy hard drive Determine whether the noise comes from the hard drive.
See Noisy hard drive on page 131.
Noisy speaker 1. Determine whether the noise comes from speaker.
2. Test with a veried working external headset/speaker.
Noisy display Determine whether the noise comes from display panel (humming noise). Change display
frequency settings. See Display on page 113.
The section below is intended for authorized service providers/technicians.
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.
Common issues and possible solutions 133
- Maintenance and Service Guide 1
- Safety warning notice 5
- Table of contents 7
- 1 Product description 13
- Display 7 19
- Using the hot keys 24
- Bottom 13 25
- Component 27
- (2) Product number 27
- (3) Serial number 27
- (4) Warranty period 27
- 3 Illustrated parts catalog 28
- Computer major components 17 29
- Plastics Kit 32
- Mass storage devices 33
- Cable Kit 34
- Miscellaneous parts 34
- Miscellaneous parts 23 35
- Tools required 36
- Service considerations 36
- Cables and connectors 37
- Drive handling 37
- Grounding guidelines 38
- Workstation guidelines 39
- Equipment guidelines 40
- Customer Self-Repair parts 41
- Description Spare part number 46
- Hard drive 47
- Solid-state drive (SSD) 49
- Memory modules 50
- WLAN/Bluetooth combo card 52
- WWAN module 54
- Keyboard 56
- 10. Remove the keyboard (8) 58
- RTC battery 60
- Internal base plate 61
- Heat sink/fan assembly 63
- Fingerprint reader assembly 65
- Touchpad board 67
- NFC module 68
- Smart card reader board 69
- USB/audio board 71
- System board 72
- Speaker assembly 75
- Display assembly 76
- Power button board 83
- Top cover 85
- 8 Troubleshooting guide 88
- Resources 89
- General troubleshooting steps 89
- Identify the issue 90
- 2. Examine the environment 92
- Analyze the issue 93
- Table 8-5 Boot-error codes 99
- Resolve the issue 101
- 13. Replace the system board 104
- Helpful Hints 105
- During operation 106
- Consulting with HP Service 106
- Power-on issues 107
- AC adapter issue 110
- Battery discharges too fast 112
- Burnt smell 113
- No video (with power) 113
- Blinking lights 114
- Diagnostics error messages 115
- Performance (OS) 116
- Intermittent shutdown 117
- Blue screen 118
- No wake up 121
- Unresponsive 123
- Slow performance 123
- Incorrect time and date 124
- Display anomalies 125
- Dead pixel 127
- No video (internal) 127
- No video (external) 128
- DisplayPort/VGA 128
- Touch screen 130
- I/O devices 131
- Keyboard point stick 132
- Keyboard backlight 132
- TouchPad 133
- Smart card reader 137
- Thunderbolt (TB) 139
- Read-write error 142
- Blue screen (BSOD) error 142
- Noisy hard drive 143
- Mechanical 144
- Noise (sound) 145
- Fan runs constantly 146
- Thermal shutdown (hot) 147
- Stuck power button 147
- Additional information 148
- Processor not executing code 149
- Memory module error 149
- Failure - System Board Error 150
- Error message list 153
- Bug check symbolic names 153
- Use Windows Debugging Tool 154
- Additional information 143 155
- 6. Open the crash dump le 157
- Additional information 145 157
- Lookup for Bug Check 0xC2 158
- Cable management 160
- Connector types 161
- Using Computer Setup 163
- Updating the BIOS 164
- Downloading a BIOS update 165
- 11 Backup and recovery 169
- Using Windows tools 170
- Restore and recovery 171
- 12 Specications 175
- Hard drive specications 177
- Nonvolatile memory usage 183
- Questions and answers 185
- 15 Recycling 187
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