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What is possible defect of no lcd backlight

how to repair lcd backlight

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chad, since you did not tell us what make or model your phone is you can only get a generic answer. No backlight can be caused by multiple issues like a bad panel, a bad LED driver as well as multiple failed components like power coils, diodes and filters within the backlight circuitry. There is not one specific component that fails but a multitude of possibilities.

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