Noise & vibration

Locate the sound without opening the monitor

Note whether a noise comes from the screen enclosure, external power adapter, speakers, dock, or computer. A soft high-pitched electronic tone may change with brightness or refresh rate; a speaker buzz may change with audio volume; a fan sound may follow temperature. These comparisons help describe the noise but do not identify a failed component. Mute audio and disconnect external speakers to separate them from monitor speakers.

Do not put your ear against vents or remove the back cover. Internal power electronics can be hazardous. Record the sound from normal desk distance and note when it occurs.

Check the mechanical setup

A monitor stand, arm, desk shelf, or cable can resonate and sound like the display. Check that the base is fully assembled, the mounting plate is secure, and cables are not tapping the cabinet or vibrating against the desk. Do not press on the panel or hold the monitor while it is powered to suppress a noise. If the display is wall-mounted, follow the mount manual before tightening any joint.

Move nearby objects such as loose speakers or desk accessories away and compare. A sound that stops when a cable is rerouted may be mechanical contact rather than an internal electronic fault.

Treat electrical warning signs as stop-use conditions

A sizzling or crackling sound, burning odor, smoke, visible arcing, or hot/damaged power adapter is not a normal noise to investigate by repeated testing. Turn off and disconnect power only if it is safe to reach the plug, then contact the manufacturer or qualified service. Do not plug the adapter into another outlet to see whether the fault repeats.

A faint sound that is present only at a specific brightness or refresh rate may be an operating characteristic, but the manual or manufacturer must confirm whether it is expected for the model. If the noise is new, worsening, or accompanied by flicker, arrange support.

Give support a useful recording

Capture a short audio/video clip at normal listening distance and include the monitor’s power state and displayed content. Note whether the sound changes when muted, when brightness changes, or when the monitor is disconnected from the computer but still powered. Do not record private work content; a plain desktop is sufficient.

Share the model and serial, adapter type, cable setup, room conditions, and whether the sound is reproducible. If the issue occurs only after long use, record the approximate interval without leaving a potentially unsafe monitor running unattended.

Compare power and audio conditions separately

Disconnect the video cable while leaving the monitor powered to see whether the noise continues. Then, if the monitor has speakers, mute them and compare. If the sound stops only when the computer is disconnected, the source or ground path may affect the noise; if it continues from the external adapter, report the adapter behavior. These tests do not authorize opening the power supply. Use only normal user connections, and restore the intended cable setup after recording the result.