HP ZBook Studio G3 Maintenance and Service Guide - Page 134

Noise (sound), Reducing Heat Inside the PC to Prevent Overheating, Fan runs, constantly,

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Noise (sound) See Reducing Heat Inside the PC to Prevent Overheating. Symptoms Computer emits abnormal noise Possible causes Aside from basic components (power adapter/supply, fan, speaker, hard drive, optical 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 verified working one. 2. Determine whether the noise comes from AC power adapter. Test with a verified 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 briefly to isolate whether noise originates from fan. If noise is absent with fan disconnected, refer to Fan runs constantly on page 121. Noisy hard drive Determine whether the noise comes from the hard drive. See Noisy hard drive on page 118. Noisy optical drive 1. Determine whether the noise comes from an optical drive. 2. Remove CD/DVD from the optical drive. Noisy speaker 1. Determine whether the noise comes from speaker. 2. Test with a verified working external headset/speaker. Noisy display Determine whether the noise comes from display panel (humming noise). Change display frequency settings. See Display on page 100. 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. 120 Chapter 7 Troubleshooting guide

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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, optical 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
verified
working one.
2.
Determine whether the noise comes from AC power adapter. Test with a
verified
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
briefly
to isolate
whether noise originates from fan. If noise is absent with fan disconnected, refer to
Fan runs
constantly
on page
121
.
Noisy hard drive
Determine whether the noise comes from the hard drive.
See
Noisy hard drive
on page
118
.
Noisy optical drive
1.
Determine whether the noise comes from an optical drive.
2.
Remove CD/DVD from the optical drive.
Noisy speaker
1.
Determine whether the noise comes from speaker.
2.
Test with a
verified
working external headset/speaker.
Noisy display
Determine whether the noise comes from display panel (humming noise). Change display
frequency settings. See
Display
on page
100
.
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.
120
Chapter 7
Troubleshooting guide