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Sony KD-55X850C no light on LED backlight

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Hi, what is the possible solution to my Sony Android TV, Model:KD-55X850C that it's power on but no light on screen. it seems not LED is not lighting up.

Is it possible that the LED bulb is faulty? as I tested the output supply for LED backlight is 66 Volts.

Where can I download the power supply schematic diagram for this model?



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