Symptoms
- Constant low hum from the TV even when muted
- Buzzing that changes pitch with picture brightness
- Rattling or buzzing during loud audio only
- Noise is louder from one side of the TV
Likely causes
- CommonCoil whine or transformer hum from the power supplySome electronic components naturally emit a faint hum, especially as they age; this is usually harmless.
- CommonLoose internal speaker or rattling panelBuzzing tied to loud bass audio often means a speaker or nearby panel is vibrating loosely.
- PossibleBacklight driver issue causing audible buzzA failing backlight circuit can sometimes produce an audible buzz along with dimming.
- PossibleExternal object vibrating against the TVDecor, cables, or wall mount hardware touching the TV can rattle with sound or vibration.
What to do
- Check whether the hum is present with the TV muted and no audio playing at all.
- Turn the volume up and down to see if buzzing is tied to audio output versus a constant internal noise.
- Inspect around and behind the TV for loose cables, mount hardware, or decor items touching the case.
- If the buzz changes with screen brightness, it's likely coming from the backlight or power circuit.
- Gently tap different areas of the TV's frame (while off) to check for a rattling internal part.
- If the sound is very faint and doesn't worsen, it may simply be normal electronic hum that's safe to ignore.
- If the buzz is loud, worsening, or accompanied by a burning smell, unplug the TV and call a technician.
When to call a pro
If the buzz is loud, worsening, or paired with dimming, have a technician check the power supply or backlight driver.
Safety
Use caution
If buzzing is accompanied by a burning smell or gets progressively louder, unplug the TV immediately and don't use it until inspected.