Check the fault: This LED TV backlight tester can test LED TV backlight and separately test TV constant current board to determine LCD TV faults. Voltage test: The tester allows manual stepless presetting of open circuit voltage (20-330VDC) and automatically adapts to LED light source voltage during testing. Current test: It can manually and steplessly preset maximum short circuit limit current (20-150mA) with intelligent automatic adjustment during testing. Effective test: When output voltage is preset to 20 or below, 1mA grade current can test offline voltage parameters of various IC power supply legs to determine IC condition. Easy to use: Features additional 1mA accuracy wide voltage (0-330V) constant current source output for versatile applications. Widely used: Suitable for testing forward/reverse voltages of diodes, regulators, transistors, MS tubes, and voltage resistance of capacitors, varistors, TVS transient diodes up to 330V. 5. 合并了重复的功能描述 6. 确保每项功能描述独立成句且通顺）