Noise (Sound) - HP ZBook 17 G3 Maintenance And Service Manual

Noise (sound)

Symptoms
Computer emits abnormal noise
Noisy fan
Noisy hard drive
Noisy optical drive
Noisy speaker
Noisy display
The section below is intended for authorized service providers/technicians.
132 Chapter 7 Troubleshooting guide
See Reducing Heat Inside the PC to Prevent
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.
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
constantly on page 133.
Determine whether the noise comes from the hard drive.
See Noisy hard drive on page 130.
1. Determine whether the noise comes from an optical drive.
2. Remove CD/DVD from the optical drive.
1. Determine whether the noise comes from speaker.
2. Test with a verified working external headset/speaker.
Determine whether the noise comes from display panel (humming noise). Change display
frequency settings. See Display on page
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.
Overheating.
112.
Fan runs