A TV set is a device that transmits moving picture images and audio signals using electronic technology according to the visual temporary characteristics of the human eye and visual psychology, i.e., a LED Television receiver. It is also an important tool for broadcasting and video communication. The basic system of the television set consists of 3 parts: camera, transmission, and display.
The TV set is mainly composed of a high-frequency head, companion audio head, companion channel, public channel, synchronous scan channel, color control display and power supply, and other parts. Its working principle is as follows.
The signal received from the antenna, through the high-frequency head to select the high-frequency LED Television signal, and amplify the processing, and then sends out a fixed IF LED Television signal.
The common channel is composed of an IF amplifier, video detector, video amplifier, and picture tube. The IF amplifier amplifies the IF signal from the HF head to sufficient amplitude detects the wave by the video detector, removes the IF carrier, restores the image signal, and transforms the second piece of audio IF signal. Image signal by video amplification is sent to the cathode of the emitting electrons in the picture tube, to control the emphasis of the emitting electron beam of the picture tube. The fluorescent screen can be displayed on the image. That's why you can see color and hear audio on the Apple TV, YouTube tv, and Bridgeton.
The structure of the TV set
1. The whole machine before and after the remote controlAs the LED Television is set on, and off, program selection, volume adjustment, and various function settings are available to complete the remote control, and thus the remote control has become an essential part of the TV peripherals. The control keys on the front panel of the TV set are getting less and less. Only the power switch is essential, because only when the power switch is on. The TV set can enter the standby state, and the remote control can have a controlling effect on the TV set. When operating the remote control, the remote control must be aligned with the "infrared receiving window" on the front panel, and various control information is transmitted to the TV through infrared light. There is a power line, receiving antenna introduction hole, and video and audio input terminal on the back cover of the chassis.
2. The main components of the TV set
Whether color or black and white LED Television sets, its chassis is generally composed of three parts: the front panel (front frame), frame, and back cover. In regular maintenance work, the front panel and frame do not have to be disassembled. Only the back cover can be removed for general maintenance operations, so there is a part of the TV front panel and frame into a whole. Remove the back cover to see the main parts of the TV set. They can be divided into three major parts: the back cover of the chassis, the front panel, frame and picture tube, etc., the main printing base plate (core), and various parts.
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