You turned on the Xiaomi Mi TV TV or Redmi Smart TV, But instead of hearing the usual sound, you hear a crackling, a squeaking, a buzzing or some other suspicious noise? 12-15% owners of smart TVs brand, and in 80% Sometimes it can be fixed on its own. Strange sounds are not always a failure: sometimes they signal a firmware failure, incorrect settings, or even external interference.
In this article, we will discuss all possible causes - from harmless (for example, to the most dangerous, HDMI-CEC It conflicts with the soundbar to critical (power supply malfunction), you will learn how to diagnose a problem by the nature of the sound, which settings to check first, and when to really contact the service center. For convenience, we have compiled a table of correspondence of sounds and their causes, which will help you quickly orientate yourself.
Important: If the sounds are accompanied by a flickering screen, spontaneous reboots or the smell of burning, immediately disconnect the TV from the network and do not turn it on until the malfunction is corrected.
1. Diagnosis by the nature of the sound: what does the crackling, squeaking or buzzing mean
The first step is to determine what sound your TV is making, and that narrows down the possible causes of your TV. 10-12 before 2-3. Below we have collected the most common “symptoms” and their likely sources.
| Nature of sound | Probable cause | Level of danger |
|---|---|---|
| High-frequency squeak (whistling) | Interference from Wi-Fi router, conflict HDMI-devices, failure of capacitors | Medium. |
| Low-frequency buzzing (humming) | Overload of the power supply, vibration of speakers, interference from electrical wiring | High-pitched |
| Crackling or clicking | Connector problems HDMI/ARC, Static electricity, damaged cables | Low. |
| Periodic "clicks" (like relays) | Automatic switching of signal sources, failure in firmware | Low. |
| Hissing or crackling from speakers | Dust on the sound board, damage to the speaker membrane, poor contact | Medium. |
If your case did not get into the table, pay attention to the conditions of sound:
- 🔊 The sound appears when turned on/off → Problem in the power supply or initialization chains.
- 🎮 The sound occurs when you connect the game console → conflict HDMI-Protocols or a lack of port capacity.
- 📶 The sound is enhanced when used Wi-Fi/Bluetooth → electromagnetic disturbance.
- 🔄 The sound disappears after the reboot → software failure.
Simple test: disconnect from the TV all external devices (set-top boxes, soundbars, USB-And then you have to check if there's still sound, and if there's a problem with the TV, if there's no problem with the TV, it's the connected hardware.
2. Software failures: when firmware or settings are to blame
In 35 percent of cases, the strange sounds are caused by software problems.
- 📱 Outdated firmware - bugs in audio drivers (relevant for Mi models) TV 4S Redmi Smart TV X 2020-2021 year-end).
- 🔄 Sound profile conflict – for example, the “Cinema” mode is enabled when connecting via HDMI ARC.
- 🎛️ Failure in audio settings – incorrectly selected audio source or output format.
- 🤖 Google Assistant bug: Voice assistant can make sounds in background activity.
How to check:
- Update the firmware through Settings → About TV → System Update.
- Reset the sound settings: Settings → Sound. → Resetting the sound settings.
- Turn it off. HDMI-CEC Settings menu → Connected devices.
- Check if the Dolby Atmos mode is enabled or DTS:X In the absence of support for connected devices.
If the sound is still there after the update, try rolling back the firmware to the previous version.
- Download the firmware archive for your model from the official Xiaomi website.
- Unpack it on a flash drive in format FAT32.
- Connect the flash drive to the TV and reset through Settings → On TV. → Local Update.
List of models with known sound bugs
Attention! If the TV stops turning on or freezes on the logo after the update, it is a sign of firmware incompatibility, in which case you will need to stream the TV via Fastboot using a PC.
3. Hardware malfunctions: when without repairs can not do
If the software methods didn't work, the problem is probably hardware.
Failure of the power supply (PP)
Symptoms: low-frequency hum, crackling, spontaneous reboots. in Xiaomi Mi models TV 4A mi TV 4C The capacitors in the power chain often fail:
- 🔌 Are there any swollen capacitors on the BP board (seen when opening the back cover).
- 🔥 Are there any darkened or burned tracks on the board.
- 📉 Does the voltage sag under load (can be checked with a multimeter).
Problems with speakers
Symptoms: wheezing, sound distortion, lack of bass. Most often, models with a thin body suffer (Mi). TV 4S 43) where the speakers are too close to the back wall:
- 🧲 Demagnetization of the membrane dynamics (treated by replacement).
- 🕳️ Dust or debris inside the speaker (can be blown through with compressed air).
- 🔌 Poor contact on speaker connectors (reconnect the plumes).
3. Maternity board malfunction
Symptoms: the sound disappears completely or is distorted, the TV does not respond to the remote control. TV Q1 mi TV P1 Realtek audio processor often fails ALC5651. This problem can only be diagnosed at the service center.
4.Problems with HDMI-port
Symptoms: cracking when connecting devices, lack of sound through HDMI ARC. 60 percent of the time, it's oxidized contact or damaged port:
- 🔄 Reconnect the cable to another port.
- 🧴 Clean the port contacts with alcohol.
- 🔧 Check the integrity of the port (whether the legs are bent).
1. Inspect the power supply on the bloated capacitors
2. Check the speakers for debris
3. Testing HDMI-cable-port
4. Measure the voltage on the board with a multimeter
-->
If you do not have experience with electronics, do not open the TV yourself - there is a high risk of damage to the board or electric shock (in the PD voltage up to 300V!).
4.External interference: why the TV "catch" other people's sounds
Sometimes, external devices or electromagnetic fields are the source of strange sounds, especially for TVs with sensitive microphones (like models with Google Assistant or Far-Field Voice).
Common sources of interference:
- 📡 5GHz Wi-Fi routers can create high-frequency noise.
- 📱 Smartphones in data mode (especially when downloading files).
- 🔌 Poor-ground electrical wiring - causes a 50Hz hum.
- 🎤 Smart speakers (e.g. Xiaomi Mi Smart Speaker) in standby mode.
- 🚗 Wireless charging for phones (radiate interference at frequencies) 100-200 keto).
How to eliminate:
- Turn off Wi-Fi on your TV and check if there is still sound.
- Move the router away from the TV (at least 1.5 meters).
- Connect the TV through a network filter with interference protection.
- Turn off the microphone in settings: Settings → Smart assistant. → Voice control → Shut down.
If the interference comes from HDMI ARC, try:
- 🔄 Use the cable HDMI 2.1. shielded.
- 🔇 Shut down. ARC sound-tuning.
- 🔊 Connect the soundbar via optical output (if any).
💡
If the TV only makes sounds at night, check if Night Mode or Sleep Timer is on in the settings, and sometimes an automatic timer termination alert is triggered.
5. Conflicts with connected devices: consoles, soundbars, receivers
Most often, strange sounds appear when connecting external devices through the Internet. HDMI, ARC Or Bluetooth. Let's look at the typical scenarios:
1. Problems with HDMI ARC/eARC
Symptoms: crackling, stuttering, spontaneous switching of sources.
- 🔌 Protocol incompatibility between TV and soundbar.
- 📶 Bad cable (especially if the length is long) >3 meters).
- 🔄 Conflict between CEC and ARC.
Solution: Turn it off HDMI-CEC In the TV and soundbar settings, use an eARC-enabled cable (if devices are compatible).
2. Conflicts with game consoles (PS5, Xbox, Nintendo Switch)
Symptoms: squeaking, buzzing when you start games.
- 🎮 The console transmits sound in Dolby Digital format+, non-television.
- 🔊 The settings are set to include consoles 3D-numeric.
- 🔌 Power shortage HDMI-Port (relevant to Mi) TV 4A).
Solution: in the settings of the consoles, select the sound format PCM or Stereo Uncompressed.
3. Problems with Bluetooth devices
Symptoms: hissing, intermittent sound.
- 🎧 Incompatible codec (e.g., aptX is not supported by a TV).
- 📶 Interference from other Bluetooth devices (fitness bracelets, wireless headphones).
- 🔋 Discharged battery in the connected device.
Solution: Reconnect the device by selecting the codec SBC or AAC.
💡
If the strange sounds only appear when you plug in a particular device, the problem is 99 percent in the device, not the TV, and try connecting that device to another TV or monitor to check.
6 How to Prevent Strange Sounds in the Future
To minimize the risk of recurrence of sound problems, follow these guidelines:
Proper operation:
- 🔌 Use a voltage stabilizer - jumps in the network most often disable the power supply.
- 🧹 Regularly (once in) 3-6 months) clean the TV from dust with compressed air.
- 🌡️ Do not place the TV near heat sources (batteries, cookstoves).
Sound settings:
- 🎛️ Do not use maximum volume (>80%) for a long time - this leads to wear of the speakers.
- 🔊 Turn off unnecessary sound effects: Settings → Sound. → Additionally. → Effects. → Off.
- 🎵 For music, use external speakers or soundbar – built-in speakers are not designed for low frequencies.
Updates and compatibility:
- 📱 Regularly update the firmware of the TV and connected devices.
- 🔄 Before connecting a new device, check the compatibility of sound formats.
- 🛡️ Use certified cables HDMI 2.1. shielded.
Diagnosis:
- 🔍 Check ports and cables once a month for oxidation.
- 📊 Use the built-in diagnostics: Settings → Support → Self-testing.
- 📞 At the first sign of a malfunction, contact the service - early diagnosis will save up to 70% of the cost of repairs.
💡
If you often connect devices to your TV, keep a diary: write down which gadget made strange noises, which will help quickly identify the “culprit”.
7.When to contact the service: signs of serious malfunctions
Not all problems can be solved by yourself. Immediately contact the service center if:
1. There was a smell of burning or smoke
It's a sign of short circuits or overheating, and even if the TV is still working, it's dangerous to keep it running!
2.The TV does not turn on or off after a few seconds
Most likely, the power supply or motherboard is faulty, and self-repair without diagnosis can exacerbate the problem.
3.The sound is accompanied by screen flickering or artifacts
This may indicate:
- 🔥 Problems with the backlight inverter (in models with LED-lighting).
- 🖥️ GPU malfunction (on Amlogic or MediaTek TVs).
- 🔌 Bad contact of the matrix plume.
4.The sound has become monophonic or one channel has disappeared
This is a sign of audio track damage or audio processor malfunction, and most of the time, chip replacement is required.
5 The television makes sounds even when it's off.
It could be:
- 🔌 Current leak in the power supply.
- 🤖 Background activity of the microphone (if the model supports voice control).
- 📡 External interference from other devices on the network.
If the TV is guaranteed, do not open it yourself - this will void the warranty. Contact the authorized service center Xiaomi with a check and a warranty card.