Guide: There is sound but no picture on the TV. What is the reason? I will take you to understand it together.
The reason why the TV has sound but no picture teaches you how to distinguish
Now every household has a TV, which has played an important role in our lives. TV sets generally match the image and sound signals broadcast by the TV station through the tuner selection, frequency conversion to the corresponding intermediate frequency signal, amplify and separate the audio signal, and output the sound, while the image signal is displayed by the picture tube. Many families will find that after the TV has been used for a period of time, sometimes there will be no picture on the screen and only sound. What kind of situation is this?
1. If there is only some noise but no picture after turning on the TV, it is likely that there is a problem with the tuner and mid-range. According to the working principle of the TV, this reason leads to sound but no picture. The picture tube can display the machine setting menu, and if it has audio and video interfaces, it can play external audio and video signals.
2. The second situation is that there is normal TV program sound, but no picture. This shows that the high frequency, intermediate frequency and sound circuits are in normal working condition, and there is no short-circuit fault in any line output circuit. If the screen can display the TV setting menu, then this kind of problem is probably because the audio is separated to the video playback section.
3. In some cases, the sound is normal, but there is no screen menu. In this case, you can turn up the brightness and contrast of the TV, pay attention to the condition of the screen, and then turn off the TV. If you see a flash of light on the screen at the moment of turning it off, with a slight discharge sound, you can be sure that the picture tube is fine. At this time, it depends on whether the filament of the picture tube is bright.
4. If it is a TV with a remote control, it is also possible that the brightness is out of control and the image is lost due to a CPU chip failure.
If the TV fails, you can carefully check it, but be careful not to knock it. If you can’t solve it by yourself, you can contact the repairman to deal with it.
