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A short circuit inside the glass panel itself, usually due to moisture or a cracked driver chip (COF – Chip on Film). lcd led repairing guide ebook
One or more individual LED chips inside the panel have shorted or burned out. The power supply detects an overcurrent/undervoltage and shuts down the backlight to prevent fire. For advanced repairs (BGA reballing, eMMC flashing, direct
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You need a Constant Current LED Backlight Tester (~$15-30). Do not use a multimeter on diode mode—it won’t provide enough voltage.