IC bus is just two lines between microprocessor and controlled integrated circuit: one is called serial data line (SDA), which is used to transmit control information, and the control signals are arranged in series according to the format of data structure. Data transmission is usually bidirectional, that is, the microprocessor can transmit information to the controlled circuit. The controlled circuit can also transmit information to the microprocessor. The other is used to transmit clock information, which is called serial clock line (SCL). Using this IC bus, the control center (microprocessor) can be connected with multiple controlled integrated circuits. So as to form an automatic control system. This control mode requires that the decoding and identification of information be located in the controlled integrated circuit. The bus control of IC bus is applied to the design of TV. The circuit is simple, and the peripheral components of the interface circuit and the integrated circuit are reduced to the maximum extent. It simplifies the wiring of the printed circuit board, reduces the area of the printed circuit board, improves the reliability of the whole machine, enhances the expansibility of circuit functions and the flexibility of design, and creates conditions for the standardized design of color TV movements.
Almost all the quantities can be controlled by IC, and the whole machine is rarely adjusted manually.
Besides, you asked how to enter the bus adjustment mode. This will vary depending on the brand and model. For example: Changhong CN- 18, CH- 16, CH- 13. The input method is: after the volume is adjusted to the minimum with the local remote controller, press and hold the mute key of the remote controller and the "Menu" key of the TV keyboard. If the operation is correct, "D" or "S" will appear in the upper right of the screen. This indicates that the TV has entered IC mode. If there are no characters on the screen, please repeat the above operation. Until the IC bus maintenance mode is entered.
When the TV set enters the "D" or "S" maintenance mode, press the "Program+/-"key on the remote control to select the item to be adjusted; Press the "Volume+/-"key on the remote controller to adjust and modify the bus data. After adjustment, turn off the remote control and exit the bus maintenance mode, and the modified data will be automatically stored.
If you want other bus access modes of various brands, please ask me and I will tell you.