What's the reason for the absence of signals on TV set-top boxes boob?
It's a system crash. Just restart it. It could be heat or memory, or the software itself is debugging
Two, audio failureAudio frequency faults mainly include AC noise and no sound.AC noise interference mainly in the LCD TV. Because the user is not standard internal grounding technology, this kind of failure. By increasing the filter or removed to ground the user inside the box to solve.No voice is a common phenomenon of digital TV, which is usually caused by the following reasons:1. audio socket damage.2. tone video line damage.3. user watch channel selection error.
I. image failureImage failure mainly include: no image (Hei Ping) and mosaic phenomenon, a small number of program search incomplete.1, no imageNo image is the most common fault in digital tv. Generally caused by the following reasons:(1) the subscriber line is plugged or inserted; the cable output signal needs to be connected to the cable input of the digital TV set top box"A socket, such as a subscriber line plug or not inserted, will indicate "signal interruption" or "no signal"".(2) the connection of audio and video is wrong or the audio and video socket is damaged.The audio and video cable of the digital TV set top box should be connected to the audio and video input jack of the TV set correctly, otherwise the TV screen will appear blue screen or black screen.(3) the user will not open or turn off the video signal. When watching digital TV, the TV should be switched to the correct AV channel.Check the TV input source is switched to the corresponding audio and video interface (according to different brands of TV or AV1, according to AV AV2, or AV3 TV, video signal input, the input source selection, some TV menu need to select the corresponding AV input is selected).(4) the signal level is too low or no signal at the receiver.When the carrier to noise ratio and code error rate are normal, the set-top box can receive digital TV programs normally when the input level is within 45 - 75dB range.
