Reddit reviews TKDMR Multipurpose Tester for LED TV Backlight and Constant Current Driver Board - Used in All LED Lights Repair Output 0-330V
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1.Model:TD3H,Real-time testing voltage and current of constant current drive board.2.Testing LED strips, LED panels, single LED bead, COB lighting sources, backlight of LED TV, displays, computers and so on.3.Testing voltage parameter of various of electronic components;Testing LED light on vehicle.4.No burn out when testing single LED bead with wrong polarity. (Set voltage around to 20V and the current switch to 1mA)5.Compatible with all the LED strips (high voltage or low voltage). Manual adjusting the range of testing voltage (20-330V/DC) and current (20-150mA).
There is very likely nothing wrong with your SMPS. It's very common for a shorted LED in the backlight to cause the SMPS to detect the LED fault and shut down. If you have an oscilloscope or can drive an array directly with an external power supply you will see the imbalance between the two arrays.
TKDMR Multipurpose Tester for LED TV Backlight and Current Driver Board - used in All LED Lights Repair Output 0-330V
Edit: drive LED array not the "panel"