SONY BRAVIA X900H Blinks Red Light

Power Supply Board (G-Board)

The power supply board contains the LED driver circuitry responsible for managing high-voltage DC to the backlight array. Component fatigue in the MOSFETs or capacitors within the driver stage often leads to unstable voltage output, triggering the TV's internal protection circuit. Replacing the board restores stable power delivery and clears the hardware-level error state.

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LED Backlight Strip Kit

Individual LED diodes within the FALD array can fail due to thermal stress from local dimming operations. When an LED fails open or short, the current feedback loop detects a deviation from the reference value, forcing the system into a red-light shutdown mode to prevent further damage. New strips ensure the entire circuit meets the required electrical resistance for the system to pass its POST (Power On Self Test).

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Main Logic Board (A-Board)

The Main Board acts as the central processor that interprets sensor data from the power and backlight stages. If the System-on-Chip (SoC) or the communication bus (I2C/UART) that monitors the protection lines fails, it may falsely report a hardware error and trigger the blinking LED. This is considered a failure of the diagnostic logic rather than a failure of the power-carrying components.

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