Examine The Environment - HP ZBook 15u G5 Maintenance And Service Manual

Failure classification by hardware devices and mechanical
Table 8-4 Failure classification by hardware devices and mechanical
4. Display
1. Display anomalies
on page 123
2. Dead pixel on page 125
3. No video (internal)
on page 125
4. No video (external)
on page 126
5. DisplayPort/VGA
on page 126
6. HDMI on page 126
7. No or bad external video
via docking on page 127
8. Incorrect or missing color/
distorted image
on page 127
9. Touch screen
on page 128
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 (110V/220V 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.
5. I/O devices
1. Keyboard on page 129
2. Keyboard point stick
on page 130
3. Keyboard backlight
on page 130
d
4. TouchPad on page 131
d
5. Network Connectivity
Ethernet (RJ-45 jack)
on page 131
6. Network connectivity
wireless (WLAN)
on page 132
7. WWAN on page 133
8. USB on page 134
9. Smart card reader
on page 135
10. Speaker, headphone -
audio issues on page 136
11. Thunderbolt (TB)
on page 137
6. Storage
1. Hard drive/solid-state
drive not recognized
on page 139
2. No boot to operating
system (no read/write
error) on page 139
3. Read-write error
on page 140
4. Slow performance
on page 121 c
5. Blue screen (BSOD) error
on page 140 b
6. Noisy hard drive
on page 141
General troubleshooting steps
7. Mechanical
1. Fan error message - 90B
on page 142
2. Noise (sound)
on page 143
3. Fan runs constantly
on page 144
4. HP Thermal Monitor
on page 94
5. Stuck power button
on page 145
89