HP ZBook Studio G4 Base Model Mobile Workstation User Manual Page 98
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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3. Check battery status light (7. Status lights, blinking light codes, troubleshooting
lights, and POST error messages on page 73). Be sure that battery is not fully
discharged, preventing system from booting.
4. Determine whether the computer can turn on with battery only.
5. Remove service door and test with a veried working battery. If the computer
boots, inspect original battery before replacement.
6. Test battery with a veried working computer to verify that it is OK.
7. If there is still no boot, remove battery and boot on AC power only.
The sections below are intended for authorized service providers/technicians.
Verify AC adapter – voltage
1. Measure DC voltage output that should be around 19.5 VDC and acceptable
voltage range is from 18.5 – 20.5 VDC.
2. If the DC voltage is out of range, replace the AC adapter.
NOTE: This action requires a digital voltmeter.
NOTE: 2015 mWS does not have the power
cable between system board and power
connector on chassis
Verify power button, power connector
1. Be sure that power button is not stuck.
2. Reseat power connector cable (if applicable).
3. Replace new power connector cable (if the cable exists and is defective)
4. To isolate faulty power connector cable and power button, technicians can short
power-on pads/pins to power up the computer. Contact HP Engineering for this
information.
Verify blinking lights (7. Status lights, blinking light codes, troubleshooting lights,
and POST error messages on page 73)
At this point, there should be sucient power from the AC adapter to the system
board. Expect to hear the fan spinning and see blinking lights or error messages (i.e.,
faulty memory, HDD, etc)
Verify Power Good (Troubleshooting) lights
1. Verify if the system board has power-on issue related. If there is no power-on
issue, move to next steps. For more information, see Power Good
(Troubleshooting) lights on page 77.
2. Verify all connections and reseat parts (10. Reseat cables and connections
on page 80).
Verify system board
1. Test essential hardware conguration (11. Test with minimum conguration
on page 80, 12. Test with veried working conguration (hardware and/or
operating system) on page 82, 13. Replace the system board on page 82) by
removing nonessential parts.
2. If there is still no boot, replace system board.
Tips and tricks Computer automatically boots without pressing power button when RTC 3V battery
has been removed. Therefore, after the service door and RTC 3V battery are removed,
no need to press power button from top side.
In essential hardware conguration, mWS G1 and G2 may require discrete GPU to boot.
However, mWS G3 can boot with integrated graphics.
86 Chapter 6 Troubleshooting guide
- Maintenance and Service Guide 1
- Safety warning notice 5
- Table of contents 7
- 1 Product description 13
- 2 Components 17
- 6 Chapter 2 Components 18
- Display 7 19
- Keyboard area 20
- Keyboard area 9 21
- 10 Chapter 2 Components 22
- Special keys 23
- Action keys 24
- Bottom 13 25
- 14 Chapter 2 Components 26
- Component 27
- (2) Product number 27
- (3) Serial number 27
- (4) Warranty period 27
- 3 Illustrated parts catalog 28
- Computer major components 17 29
- Computer major components 19 31
- Bracket Kit 33
- Plastics Kit 34
- Miscellaneous parts 34
- Miscellaneous parts 23 35
- Tools required 36
- Service considerations 36
- Grounding guidelines 37
- Bottom cover 41
- Solid-state drive (M.2) 43
- WLAN module 45
- Memory module 47
- RTC battery 49
- Thermal module 50
- Description Spare part number 53
- Fingerprint reader board 54
- LED board 55
- Display cable 57
- System board 58
- I/O support bracket 61
- Speakers 62
- Keyboard 63
- 4. Remove the keyboard (2) 64
- Display assembly 65
- Top cover 74
- 6 Troubleshooting guide 75
- Resources 76
- General troubleshooting steps 76
- Identify the issue 77
- 2. Examine the environment 79
- Analyze the issue 80
- Resolve the issue 90
- 13. Replace the system board 94
- Helpful Hints 95
- Consulting with HP Service 96
- Power-on issues 97
- AC adapter issue 100
- Battery discharges too fast 102
- Burnt smell 103
- No video (with power) 103
- Blinking lights 104
- Diagnostics error messages 105
- Performance (OS) 106
- Intermittent shutdown 107
- Blue screen 108
- No wake up 112
- Unresponsive 113
- Slow performance 113
- Incorrect time and date 114
- Display anomalies 115
- Dead pixel 117
- No video (internal) 117
- No video (external) 118
- DisplayPort/VGA 118
- Touch screen 120
- I/O devices 121
- Keyboard point stick 122
- Keyboard backlight 122
- TouchPad 123
- Smart card reader 127
- Thunderbolt (TB) 129
- Thunderbolt 3 dock 130
- Read-write error 133
- Blue screen (BSOD) error 133
- Noisy hard drive 134
- Mechanical 135
- Noise (sound) 136
- Fan runs constantly 137
- Thermal shutdown (hot) 138
- Additional information 139
- Processor not executing code 140
- Memory module error 141
- Failure - System Board Error 141
- Additional information 131 143
- Error message list 144
- Bug check symbolic names 144
- Use Windows Debugging Tool 145
- 6. Open the crash dump le 148
- Lookup for Bug Check 0xC2 149
- Additional information 137 149
- Cable management 151
- Connector types 152
- Using Computer Setup 154
- Updating the BIOS 155
- Downloading a BIOS update 156
- Using Windows tools 161
- Restore and recovery 162
- 10 Specications 166
- Nonvolatile memory usage 171
- Questions and answers 173
- 13 Recycling 178
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