Why does the TV only have sound but no picture?

The reason why the TV only has sound but no image: 1. The video cable is not well connected or is loose. You can re-plug the video cable for testing; 2. The connection port of the TV signal source and the set-top box If it is not plugged in correctly, be sure to find the corresponding color when plugging in the AV cable.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

Why does the TV only have sound but no images?

The general reasons why the TV has sound but no image (black screen) are:

1. The video cable is not well connected or is loose

TV When there is only sound but no picture, the first thing to consider is the video cable. This is also a common reason. When the video cable connected to the TV is loose, the TV will not display any picture, which is what we call a black screen, but the sound is fine. At this time, you can replug the video cable and conduct a test.

2. The signal source of the TV and the connection port of the set-top box are not plugged in correctly

If the TV is moved and you re-plug the cable, and there is no picture on the TV, It is necessary to consider whether the connection cable is plugged into the correct interface. When the signal source of the TV and the connection port of the set-top box are not plugged in correctly, the picture will not be displayed. When plugging in the AV cable, be sure to find the corresponding color.

Common faults in using TVs

1. Automatic channel search will jump out after a quick search and return to a raster shape without characters; open the internal menu and record everything item by item data, replace the memory 24C04, then open the internal menu, rewrite the original data into the new memory, press the "Station Jump" key to exit the internal menu, and then adjust the user menu, you can search for channels again.

2. When automatically searching for channels, the program number can be increased, but the station is not saved after searching, especially when using cable TV. The program number can be increased, indicating that the AFC and line synchronization signals Normal, disassemble the machine and check whether the seven pins of the memory are grounded. If not, just connect the seven pins of the memory to the ground. If it is grounded, replace the memory.

3. The field frequency is unstable and slowly moves downward; for this kind of phenomenon, it is generally believed that the fault is in the field part. Open the internal menu and copy the original data. Just copy the original data after replacing the memory.

4. Three noes, the indicator light does not light up; it is probably a problem with the accessories.

5. The TV is magnetized. The reason for this failure is that the TV is subject to severe vibration, the internal degaussing resistor is damaged, and the deflection coil or pure magnetic ring inside the TV is displaced due to the magnetization of nearby magnetic objects. Ask professional maintenance personnel to repair it. If the screen display is normal except for the screen halo phenomenon, a professional degausser can solve the problem. If this fault cannot be solved, it is likely that the degaussing component is damaged and needs to be replaced.

6. The whole TV has no power, which is mainly caused by the internal power supply and the external power supply of the TV set. Generally, the external power supply failure rate will be higher. Failures caused by the power supply part can usually be solved by replacing parts; if the driver board fails, check whether the power supply is normal. The driver board failure causes the two power supplies to have no output voltage. If there is a problem with the voltage, it must be caused by the driver board. Fault.

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