My home computer is connected to BenQ VP22 12 LCD TV, and I found that there are three audio interfaces behind the TV. There is no sound after plugging in the red and white left and right channel connectors, and there is still no sound after switching to another set of red and white channel connectors. Excuse me, what the hell is going on?

Answer: LCD TVs usually provide multiple sets of audio interfaces, which need to be used with corresponding video interfaces. BenQ VP22 12 provides three sets of audio input interfaces, of which the single audio interface on the left is mainly used with HDMI interface or VGA interface, and the two audio interfaces in the middle are mainly used with color difference terminals, so the two audio interfaces on the far right are used with S terminal or AV interface. At present, if you connect the wrong audio interface, LCD TV will appear? Lose your voice? . Therefore, when connecting a computer and a TV, you must pay attention to the English label of the audio interface before connecting.

Causes and phenomena of TV without sound

1. Mute or audio amplifier is broken.

2. The audio cable is not connected correctly or connected incorrectly.

3. Digital set-top box failure.

There is something wrong with the sound circuit or wiring.

Now it's like 1: when the TV is used, there is no sound suddenly, and other functions such as images are fine.

First, check whether the settings are correct. First, check whether the mute button on the remote control is pressed. Secondly, check whether the volume is set to 0. Third, check the signal source. Wired signal, check whether the remote control audio system is in D/K system (Shenzhen users are in I system). The set-top box or satellite receiver turns the channel button to the left channel and checks whether the audio cable is connected correctly.

Second, listen to the noise. If the noise is caused by the shift of sound intermediate frequency, the sound can be restored by changing or fine-tuning the sound intermediate frequency. If the noise is small, it is not an audio intermediate frequency fault. Check the audio power amplifier to see if the performance of the power amplifier module or peripheral components is deteriorated. If you don't understand electronics, don't touch them, so as not to cause unnecessary losses. Please have it checked by a professional.

Phenomenon 2: After the digital TV set-top box is installed, the TV has no sound.

First, check whether the wiring is in good condition. Try changing the audio cable to see if there is any sound. Is there any sound when playing DVD? There is a voice to prove that there is nothing wrong with the TV.

Second, if the wiring is good, the problem lies in the following two situations:

1, set-top box problem. Considering that your set-top box is newly installed, this possibility is mostly.

2. Signal reason. If the signal is not good, there will be a fault with sound for a while and no sound for a while. Please contact the local cable communication department.

Phenomenon 3: the computer is connected to the TV. Why is there no sound on TV?

That's because the computer is connected to the TV only to transmit video signals, and the audio signals are not connected, so you need to connect an audio signal line to the TV at the host.

The first method is to connect using HDMI interface.

HDMI interface can output sound. First install the driver, and the HDMI audio output will be displayed in the device manager. Then, disable the sound card that comes with the motherboard, and then select HDMI in the sound option of control panel-sound output to output sound. If using DVI-HDMI adapter, use 24+ 1 pin adapter as much as possible.

The second method is to use audio cable.

Find an audio cable, one end of which is connected to the audio input port of the TV, and the other end is connected to the computer earphone interface. Both ends of a line are 3.5mm, which is very convenient. Pay attention to the length of the cable. One end of the other line is a 3.5mm audio line, and the other end is a Lotus AV color difference line. The method is the same.

Phenomenon 4: TV images are normal without sound, only one station has sound.

Analysis of TV fault maintenance: (1). The ic input pin of the pen-and-pencil induction power amplifier has a click sound, indicating that the audio power amplifier circuit is normal. (2) Because the failure rate of sound processing njw 1 136 is high, it is still the same to replace njw 1 136 first. (3) It is invalid to replace the memory later. (4) The machine adopts an integrated synthesis tuner, and the audio and video signals are directly demodulated and output by the tuner. A jumper is connected in series with a small electrolytic capacitor, which is directly connected from the audio output pin of the tuner to the input end of the power amplifier circuit, and the accompanying sound appears immediately. It means that the tuner is normal, and continue to check backwards. It is found that when q 120, the lamp bias voltage is too low, and the bias resistance r 120( 100k) is close to open circuit. Find a slightly larger 100k resistor and put it on the tester. Everything's fine. In daily maintenance, it is found that some resistors with large resistance and low power have high failure rate, such as the blue screen caused by the increase of r0 10 resistance in our at25289 machine. Therefore, we should pay attention to these resistors with large resistance and low power in maintenance, and try to replace them with a higher power when replacing them.

Phenomenon 5: TCL TV has no sound. What's the matter?

There are many reasons why TCL TV has no sound. First, detect the defects of Q704(PMBS3904). According to the situation, the fault occurred on the digital board channel after CN20 1 was plugged and unplugged. In order to further narrow the fault range, CN2 is externally connected with an earphone interface, and the sound is normal. U502(njw 1 147) sound processing chip and its common troubleshooting. The fault range was locked on the power amplifier and loudspeaker of the later stage U503(mx9704), and then U503 was detected. It is found that the voltage of the power supply pin 3 4 2 1 22 of U503 is only 12V, which is lower than the normal machine's 20V. According to the circuit, the power supply of U503 is converted from Q70 1, while Q5065438+. b？ Go, fuck? c？ The control electrode Q50 1 is on, and the model of Q50 1 is 4403.

These are the reasons why TCL TV has no sound. You need to replace 4403 to solve this problem. Non-professionals are forbidden to do this!

Phenomenon 6: After Konka t2979x TV replaced the 8427 integrated block, what happened with images but no sound?

1. You didn't notice that the channel was disconnected during the change.

There is a problem with the replaced audio channel. You can measure it with a multimeter.

3. See if the audio IC has power supply.

4. Other minor problems of poor contact.

At first, the sound was ok, indicating that the output was normal after decoding, but later it failed, indicating that you changed the time, to see if you changed a broken part of the integrated block, and then to see if the nearby circuit was loose.

Phenomenon 7: There is no sound after the TV is struck by lightning, and everything else is normal (Konka T2525).

Cause of failure: The voltage change of the mute control pin of CPU is too small, only 4.5V-4.65V (normally it should be 0V-4.5V), so it can be judged that the bus is really out of order, but if there is information about this machine, follow this pin. When the 4 148 diode next to this pin is turned off, sound is available. I tried the mute function, so I used it first and then learned it.

Phenomenon 8: There is no sound on the Internet TV.

Is there a picture but no sound when the network TV is playing? Audio rendering failed? Or? Is it okay? T audio rendering, what is the reason? If you encounter such problems, you can try the following methods:

The version of Windows Media Player installed in 1. computer is lower than 9.0. Please upgrade the version of Windows Media Player to 9.0 or later. After the upgrade, please reinstall the Internet TV client.

2. If the version of Windows Media Player in the computer has reached 9.0 or above, some plug-ins of Windows Media Player may be damaged. Please reinstall Windows Media Player, and then reinstall the Internet TV client.

3. Check the version of Windows Media Player: Open Windows Media Player and click? Help? Menu, select? About Windows Media Player? .

4 .Windows Media Player can be upgraded through Microsoft website or other software download websites.

The solution to the sudden silence of the computer

0 1, the computer has a sound card but no sound.

1, check whether the connection between the host and the speaker is loose or disconnected, whether the speaker power supply is turned on, and whether the speaker volume adjustment knob is turned off to the minimum.

2. For the independent sound card, check whether the sound card is in good contact with the motherboard slot and plug it in again.

3. Open it? Device manager? Check whether there is a problem with the sound card installation driver. Solution: Right-click the desktop? My computer? Choice? Attribute? Eject? System properties? The window? Choice? Hardware? Peggy? News? Device manager (d)? Button? Eject? Device manager? The window? Check? Sound, video and game controllers? Or? Multimedia audio controller? Did you have one before? ! ? Or, if the driver of the sound card is damaged, please find the driver disk of the sound card and reinstall the driver (if the sound card is integrated on the motherboard, the driver is in the driver disk of the motherboard).

02. If the sound card driver is installed correctly, the computer still has no sound.

1, in? Device manager? The sound card is disabled internally. Solution: input? Device manager? , expand? Sound, video and game controllers? Branch, find the sound card item (if it is disabled, there is one on the front speaker? x？ ) and select it, and then press? Enable? Just press the button.

2. Turn off the volume in the sound properties. Solution: input? Control panel? , double click? Sound and audio equipment? Items, pop up? Sound and audio device properties? Window, select? Volume? Page, adjust the volume adjustment slider to the appropriate position, and then click? Put the volume adjustment icon in the taskbar (i)? Take the bait before, and confirm to quit.

03, the coup to solve the computer without sound.

1, check whether the sound card, cables, speakers and other equipment are connected normally; Run antivirus software for antivirus;

2. Right click? My computer? - ? Attribute? - ? Hardware? - ? Device manager? , open? Sound, video and game controllers? Is there a problem? Just see if there is a yellow one in front. If so, reinstall the driver of this device to solve it;

3. When there is sound, but there is no small speaker, open the control panel-audio and video equipment-volume, at? Put the volume icon in the taskbar? Tick in front;

4. When there is no sound or speakers, open Control Panel-Add and Remove Programs-Add and Remove Windows Components, and then click? Accessories and tools? Before checking the number, click? What's next? , and then, shut down and restart, the system will prompt to install new hardware, and follow the prompts to install;

5. Uninstall the sound card driver and reinstall or upgrade the audio driver;

6. When installing the sound card driver? Can't find the AC chip? Tip: It is possible that the computer is poisoned, or the sound card driver has been deleted by mistake due to illegal operation, or there is internal software conflict. The solution is to reinstall the system and drivers.

04. All the configurations are connected normally, and the computer suddenly has no sound. What should I do?

Solution 1:

In safe mode, after deleting the sound card driver, enter normal mode, then let the system find the sound card device again, and then reinstall the sound card driver according to the prompt. After the installation is successful, open the control panel-Sound to see if the sound card device is found. If found, the speaker icon in the lower right corner also appears, and there is still no sound, that is, the sound card is broken. In this case, the integrated sound card needs to be replaced by the motherboard (the sound card driver is best matched with the driver disk at that time, if not,

Solution 2:

After the computer is turned on for a period of time, there is often a sudden silence. Some of these failures are because the old sound card does not support multi-audio streams, nor does it support the ACPI interrupt function. When dialing the Internet, there is a resource conflict with the modem, or programs such as games and MP3 players make mistakes carelessly, which occupies the port of the sound card and cannot be released. This kind of fault only needs to restart Windows, but the real solution is to replace the hardware.

Incorrect sound card driver version may also cause this kind of failure. If a user installs a driver that has not been authenticated by Windows digital signature, or the drivers of WinNT and Win2000 are installed in WinXP, it can be used normally, but in some special cases, such as when recovering from hibernation, there will be a failure of no sound, minimal sound and great noise. This situation can be solved by replacing it with the correct driver or restarting Windows.

Although this kind of fault is relatively simple, it is easy for users to think that Windows is not installed properly or there is something wrong with the hardware, so it is unnecessary to format and reinstall it, which wastes time and energy.

05. After reinstalling the system, someone in QQ sent a message and there was no sound. A sound was set, but there was no sound. What if QQ has no sound?

If only qq has no sound, just import a sound file. Personal Settings-System Settings-Sound Settings-Turn on the sound, and put a box in front of it. If not, there is a customer message/system message/new online/group under the startup sound, and then there is the sound path below. You can find these files from the qq directory and put them in it. Or play your favorite sound.

06. Users who are not familiar with BIOS may misuse the shielded onboard sound card, which may also cause the computer to suddenly mute.

Enter the BIOS and select the I/O device configuration? On-board AC97 audio controller, choose ENANLE or AUTO (ASUS motherboard). Due to different motherboards or different BIOS versions, the operation methods may be somewhat different, but they are basically the same. If it is an award-winning BIOS, enter the BIOS? Integrated peripherals? , and then select? AC97 audio? Change? Disabled? For what? Cars? Save it.

07. After installing a network card or other equipment, the sound card no longer sounds, resulting in no sound in the computer.

This kind of problem is representative, mostly because of compatibility problems and interrupt conflicts. 46jh-4) The problem of driver compatibility is relatively easy to solve, and users can update the drivers of various products. Interrupting the conflict is more troublesome. Enter the control panel first? System? Device manager, query their respective IRQ interrupts, you can manually set IRQ directly to eliminate conflicts. If the conflict cannot be eliminated in the device manager, the best way is to return to the BIOS, turn off some unnecessary devices, and save unnecessary IRQ interrupts. You can also change the slots of network cards or other devices, which will also change their IRQ interrupts to eliminate conflicts. Should I enter BIOS after changing slots? PNP/PCI？ Item? Reset configuration relationship data? Change it to ENABLE, clear the PCI device table, and reassign the IRQ interrupt.

Look at the reason why there is no sound when the computer is connected to the LCD TV:

1. How can I set the computer to have no sound even on the TV?

2. How to solve the problem that there is no sound when the desktop is connected to the TV?

3. There is no sound solution when the computer is connected to stereo.

4. Why is there no sound on 4.AOC TV?

5. What if there is no sound when LeTV connects to the computer?

6. How to deal with the sound when LeTV is connected to the computer?