HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 70

Examine the environment, 3. Perform a visual inspection of hardware, devices

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Table 6-5 Failure classification by hardware devices (continued) 4. Display 2. Dead pixel on page 94 3. No video (internal) on page 94d 4. No video (external) on page 95d 5. DisplayPort/VGA on page 95 6. HDMI on page 95 7. No or bad external video via docking on page 96 5. I/O devices 2. Keyboard pointing stick (select products only) on page 99 3. Keyboard backlight on page 100 4. Touchpad on page 100 5. Network connectivity (RJ-45 jack) on page 101 6. Network connectivity wireless (WLAN) on page 101 8. Incorrect or missing color/ 7. WWAN on page 102 distorted image on page 97 8. USB on page 102 9. Touch screen on page 97 9. Smart card reader on page 103 6. Storage 2. No boot to operating system (no read-write error) on page 108 3. Read-write error on page 108 4. Slow performance on page 109c 5. Blue screen (BSOD) error on page 109b 6. Noisy hard drive on page 109 7. Mechanical 2. Fan runs constantly on page 111 3. Thermal shutdown (hot) on page 112 10. Speaker, headphone audio issues on page 104 b,c,d similar symptoms 11. Thunderbolt (TB) on page 105 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 might be needed. Perform the following environment inspections: ● Check all cables and connections to be sure that no connections are loose. ● Confirm that power sources are good, such as AC outlet or 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, uncertified devices, incompatible hardware (for instance, 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, two-way radios, floor mats, fans (and other electronic motors). EMI may contribute to a display freeze issue or lock-up. 3. Perform a visual inspection of hardware Perform a physical inspection of the computer. ● Look for abnormalities such as a cracked display, dented battery, broken latches for battery bay, keyboard key caps popped out, dust over connectors, liquid spill over keyboard. ● Look for signs of drop, movement, or vibration that may cause internal and external loose connections. 2. Examine the environment 61

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Table 6-5
Failure classification by hardware devices
(continued)
4. Display
5. I/O devices
6. Storage
7. Mechanical
2.
Dead pixel
on page
94
3.
No video (internal)
on
page
94
d
4.
No video (external)
on
page
95
d
5.
DisplayPort/VGA
on page
95
6.
HDMI
on page
95
7.
No or bad external video
via docking
on page
96
8.
Incorrect or missing color/
distorted image
on page
97
9.
Touch screen
on page
97
2.
Keyboard pointing stick
(select products only)
on
page
99
3.
Keyboard backlight
on
page
100
4.
Touchpad
on page
100
5.
Network connectivity
(RJ-45 jack)
on page
101
6.
Network connectivity
wireless (WLAN)
on page
101
7.
WWAN
on page
102
8.
USB
on page
102
9.
Smart card reader
on
page
103
10.
Speaker, headphone -
audio issues
on page
104
11.
Thunderbolt (TB)
on page
105
2.
No boot to operating
system (no read-write
error)
on page
108
3.
Read-write error
on page
108
4.
Slow performance
on
page
109
c
5.
Blue screen (BSOD) error
on page
109
b
6.
Noisy hard drive
on page
109
2.
Fan runs constantly
on
page
111
3.
Thermal shutdown (hot)
on page
112
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 might be needed. Perform the following environment inspections:
●
Check all cables and connections to be sure that no connections are loose.
●
Confirm that power sources are good, such as AC outlet or 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, uncertified
devices, incompatible hardware (for instance, 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, two-way
radios, floor mats, fans (and other electronic motors). EMI may contribute to a display freeze issue or
lock-up.
3. Perform a visual inspection of hardware
Perform a physical inspection of the computer.
●
Look for abnormalities such as a cracked display, dented battery, broken latches for battery bay, keyboard
key caps popped out, dust over connectors, liquid spill over keyboard.
●
Look for signs of drop, movement, or vibration that may cause internal and external loose connections.
2. Examine the environment
61