No backlight on Samsung UN32F5500, suspect power board

Found TV on the side of the road and decided it would be a fun project. TV powers on, but no display. Moving the jog controller causes noises that are consistent with volume control and menu functions. Shining a light on the screen shows some text moving around the screen, so the LCDs are working. Looks like the backlight is dead. Testing the voltage at the connector to the LEDs, I read roughly 200V on 1 of the 5 lines, and roughly 0V on the rest. Looking at videos, it sounds like I should be seeing 200V across all of the lines, which makes me suspect the power board is faulty. I get the same readings with the LED cable connected and disconnected. Before I spend $30 replacing the power board, can someone give be confidence that it really is the power board and not the LED strips? I’m surprised to see one line correct and the others faulty; I would have expected it to be more all-or-nothing. Happy to provide more details if it helps.