Generic photo: Andrey Gvrv · CC BY-SA 3.0

TV LED backlight strips and LED driver

LED strips are wired in series strings and run from a constant-current driver at high DC voltage (often around 80-200 V total). One dead LED opens the string and the driver shuts down. Test LEDs with a backlight tester, not a meter diode range, and replace all strips as a set.

Cross-checked ~120 min advancedBrands: All

Before you start

The LED driver output is high-voltage DC; unplug and wait before touching the backlight connector
Do not measure driver output unless trained; outputs can exceed 100 V DC
Panel glass cracks easily; work on a soft, flat surface and do not press the panel

Diagnostic steps

Unlock all 6 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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