Some Samsung TV owners have reported hearing a buzzing noise while their TV is in standby mode. This sound, often compared to the high-pitched buzzing of a mosquito, can be particularly noticeable in quiet environments like a bedroom. If you’ve encountered this issue, you’re not alone. In this article, we’ll explore the possible causes of this noise and the steps you can take to eliminate it.
Why is there a buzzing noise in the TV set?
Samsung TVs use power supplies that convert mains voltage into the secondary voltages required for various components, including the main board, T-Con display control board, and backlight. These TVs are equipped with switching power supplies, which operate at high frequencies and adjust their output based on the load. While these power supplies generally function quietly under normal load, they may produce a buzzing sound in certain conditions—especially under partial load. This is not a defect but rather a characteristic of the power supply, which can sometimes enter resonance at specific power levels, such as around 15% load.
When the TV enters standby mode, some components, like the screen and processor, are powered down. However, others continue to operate and consume electricity. For example, RAM, HDMI ports, the Wi-Fi module, and USB ports may remain active. If the power consumption in standby mode falls within a certain range, the power supply can begin to emit a buzzing sound.
How to eliminate buzzing in your TV set
If you’re bothered by the buzzing sound, you can adjust the standby load on the power supply by disconnecting or connecting components that remain active in standby mode.
Reducing the Buzzing Sound
- Disable Anynet+ (HDMI-CEC) – This feature manages HDMI-connected devices and keeps the ports powered in standby mode. If you don’t need it, disabling it will de-energize the HDMI ports, which may reduce the buzzing.
Path: Settings → All Settings → Connection → External Device Manager → Anynet+ (HDMI-CEC) - Disable IP Control – When enabled, this setting keeps the Wi-Fi module powered in standby mode, allowing the TV to be turned on remotely via the internet, such as through Alexa voice commands. If you only use the remote control, disabling this option will reduce power consumption and may help eliminate the buzzing.
Path: Settings → All Settings → Connection → Network → Expert Settings → Wi-Fi
Increasing the Load Instead
If reducing the load doesn’t resolve the issue, you can try the opposite—increasing the power supply load to stabilize its operation:
- Enable Anynet+ (HDMI-CEC) if it is currently disabled. While not as commonly used today, it is still required for the Audio Return Channel (ARC) function.
- Connect a device to a USB port – Some Samsung TVs keep USB ports powered in standby mode. Try plugging in a device with higher power consumption, such as a smartphone, and observe if the buzzing changes. However, note that not all TVs supply power to USB ports when in standby.
By adjusting these settings and connections, you can find a configuration that minimizes or eliminates the buzzing noise.
