Memory introduction of IIC bus TV
In the I²C bus color TV, an E2PROM (Electrically Erasable Read-Only Memory) plays a crucial role by storing essential information. This memory functions as an electronic data warehouse, holding all the data that controls the TV's operation, features, and settings. Every time the TV is powered on, the main control CPU retrieves this data to ensure the device operates correctly. In a standard remote-controlled color TV, the memory stores various types of data, including program data (such as frequency bands and tuning voltages), analog parameters (like volume, brightness, contrast, and color), and display-related settings.
In an I²C bus TV, the memory not only holds the same data as a conventional remote-controlled TV but also includes additional information such as adjustment data for various integrated circuits, circuit state configurations, and self-diagnostic fault data. Although the amount of data stored in the E2PROM is substantial, it can generally be categorized into two main groups based on their functionality:
1. **Fixed Data**: These are static values that remain consistent across all TVs within the same I²C bus system. They do not require user adjustment and are typically used for control functions, switch operations, or mode transitions. For example, in a Liyin TV, the power-on and power-off levels for the audio system; in a picture-in-picture TV, the activation thresholds for the secondary screen; or in a graphics TV, the on/off levels for specific display modes.
2. **Average Data**: These values represent the typical or standard settings found in most TVs of the same I²C bus system. They reflect the normal operating conditions of the control circuits and may vary slightly between units. Examples include white balance settings for the picture tube, field amplitude values, and other similar parameters. Some I²C systems use these average values as reference points during initialization or calibration.
The adjustment items and corresponding data in an I²C bus TV are usually presented in a tabular format within the memory, known as a "data table." This table serves as the foundation for the initialization process. During maintenance or repair, if an adjustment fails, this table can be used to restore the correct settings. The content of these tables varies depending on the I²C system, with differences in adjustment projects, average values, and even relationships between specific adjustments and the integrated circuits they affect. These details provide valuable guidance for technicians when performing repairs or calibrations.
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