What is the reason why the TV doesn't show pictures?

There may be something wrong with the tuner and tuner. According to the working principle of TV, this has caused TV to have sound but no image. CRT can display the menu of machine settings, and has audio and video interface, which can play external audio and video signals.

1. If there is only some noise and no image after turning on the TV, this situation may be caused by problems with the tuner and amplifier. According to the working principle of television, for this reason, there is sound without image. The picture tube can display the machine setting menu, and has an audio and video interface, which can play external audio and video signals.

2. The second situation is that the sound of TV program is normal, but there is no picture. This shows that the high frequency, intermediate frequency and sound circuits work normally, and the line output circuit has no fault or short circuit. If the TV menu can be displayed on the screen, this problem may be caused by the separation of audio and video playback.

3. Otherwise, the sound is normal, but there is no on-screen menu. So 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 slight discharge flash on the screen at the moment of shutdown, you can be sure that there is nothing wrong with the picture tube. At this time, it depends on whether the filament of the picture tube is on.

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 the failure of the CPU chip.