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LED TV backlight & constant current board (TD3H) is a high grade test and maintenance tool with three utility model patents.
This product has a powerful function: 1.Test any LED back-light strip and LED bead, 2. Test constant current board 3. Test voltages of multiple components.
This product uses AC-DC isolation Switching Mode Power Supply and a series of automatic intelligence to control the circuit, LED double table digital display ,safe and convenient.
The tester has adjustable current with loads,Default factory setting：output voltage 330V，output current 50mA
Plug in power，turn the power switch on，the tester is ready after the voltage rise to 330V and keep steady. You can test any size single LED bead, strip at default settings. If you need testing a single LED bead with unkown polarity, set the voltage to around 20V for safety (be safe as well if get the wrong polarity). And also you can turn to 1mA with the red switch if it is hurt your eyes.

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