There is a computer called' Central Processing Unit' in it, which is called CPU in English. It's a computer for TV sets. When the CPU is manufacturing, it inputs the password information of various menus of the TV, so the remote control transmitter of the TV can realize the remote control of the TV as long as it sends the corresponding password.
principle of operation
The TV remote controller mainly relies on integrated circuits to send instructions. The chip is packaged in 18 pin dual in-line package. On the right side of the chip, you can see a diode, a transistor, a vibrator, two resistors and a capacitor. There is also a resistor and a capacitor next to the battery contact.
In this circuit, the chip can detect when the key is pressed. Then, it encodes the key information in a form similar to Morse code, and the encoding of each key is different. The chip will send these signals to the transistor for amplification to enhance the signal.
Refer to the above? Baidu encyclopedia-TV remote control