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I think I've found a short between three leads on the PCB. I had soldered the component a second time after the first wasn't so successful and saw a lot of erratic behavior. After desoldering, I verified with my multimeter that 2, 3, and 4 are showing continuity despite there being no discernible connection on top of the board. Does anyone have any experience with this? Is this something that can be fixed? Any help would be greatly appreciated!
For that matter, it sounds as though this should be working as I solder in the rows of LEDs one by one or is that not the case, do they need to all be connected for this to work correctly? I have two in at the moment and am seeing that current is flowing through only about half of the resistors on the board.