Examine The Environment - HP ZBook 14u G6 Maintenance And Service Manual

Failure classification by hardware devices and mechanical
Table 8-5 Failure classification by hardware devices and mechanical
4. Display
1. Display anomalies
on page 115
2. Dead pixel on page 117
3. No video (internal)
on page 117
4. No video (external)
on page 118
5. DisplayPort/VGA
on page 118
6. HDMI on page 118
7. No or bad external video
via docking on page 119
8. Incorrect or missing color/
distorted image
on page 119
9. Touch screen
on page 120
b,c,d
similar symptoms

2. Examine the environment

It is important to examine the computer's environment. If you can quickly identify the cause of the issue,
fewer resolution steps may be needed. Perform the following environment inspections:
● Check all cables and connections to be sure that there are no loose connections.
Confirm that power sources are good, such as wall power type/adapter (110 V/220 V ac), power strip.
●
Test with a verified working AC outlet.
Check for compatibility issues between the computer and third-party devices, peripherals, noncertified
●
devices, incompatible hardware (i.e., Mac OS device). Incompatibility can result in blue screen errors,
improper operation, and so on.
Isolate the computer from sources of electromagnetic interference (EMI), such as cell phones, 2-way
●
radios, floor mats, fans (and other electronic motors). EMI may contribute to a display freeze issue or
lock-up.
84 Chapter 8 Troubleshooting guide
5. I/O devices
1. Keyboard on page 121
2. Keyboard point stick
on page 122
3. Keyboard backlight
on page 122
d
4. Touchpad on page 123
d
5. Network Connectivity
Ethernet (RJ-45 jack)
on page 123
6. Network connectivity
wireless (WLAN)
on page 123
7. WWAN on page 124
8. USB on page 124
9. Smart card reader
on page 126
10. Speaker, headphone -
audio issues on page 127
11. Thunderbolt (TB)
on page 128
6. Storage
1. Hard drive/solid-state
drive not recognized
on page 130
2. No boot to operating
system (no read/write
error) on page 130
3. Read-write error
on page 131
4. Slow performance
on page 113 c
5. Blue screen (BSOD) error
on page 131 b
6. Noisy hard drive
on page 132
7. Mechanical
1. Fan error message - 90B
on page 133
2. Noise (sound)
on page 134
3. Fan runs constantly
on page 135
4. HP Thermal Monitor
on page 88
5. Stuck power button
on page 136