Memory introduction of IIC bus TV
In the I²C bus color TV system, an E2PROM (Electrically Erasable Read-Only Memory) plays a crucial role by storing essential data that ensures the TV functions properly. This memory acts as an electronic data repository, containing all the information needed to control the TV's operation, features, and settings. Every time the TV is powered on, the main control CPU retrieves this data to initialize the system and restore normal functionality.
The memory in a standard remote-controlled color TV typically holds program data such as frequency bands and tuning voltages, along with analog values like volume, brightness, contrast, and color saturation. It also includes display character settings. In an I²C bus TV, however, the memory goes beyond these basics. It also stores adjustment data for various integrated circuits, circuit state configurations, and self-diagnostic fault information.
Although the amount of data stored in the E2PROM can be quite large, it can generally be categorized into two main types:
1. **Fixed Data** – These are consistent across all TVs within the same I²C bus system. They are pre-programmed and do not require user adjustment. Fixed data includes control-related parameters such as power-on/off levels, picture-in-picture settings, or specific mode transitions. For example, in a Liyin TV, the audio activation level upon startup, or in a picture-in-picture model, the threshold for activating the sub-screen.
2. **Average Data** – This type of data varies slightly between different units of the same I²C bus system. It represents the typical values observed in a large number of functioning TVs. These data points relate to operational states of the control circuits and may vary based on performance. Examples include white balance settings for the CRT, field amplitude values, and other similar parameters. Some systems use average data as reference or standard values during initialization.
The adjustment parameters and corresponding data in an I²C bus TV are usually organized in a table format within the memory, known as a "data table." This table serves as the foundation for the TV’s initialization process. During repairs or adjustments, if a setting fails, this table can be used as a reference to restore the correct configuration. The structure and content of these tables differ depending on the I²C system, including the types of adjustment projects, average values, and functional relationships between components. These details serve as important guides for technicians performing maintenance and troubleshooting.
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