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It has been quite a few weeks since i put my hands back onto my headset LED mod, with the exception of still using them on the daily lol. I don't quite remember the voltages, but they were around 4 volts, when it worked, I guess some of the LEDs went bad, shorting the circuit, causing the low to no voltage. when i unhooked BOTH of the discs with the LEDs i got a good voltage. I did solder into the main power on the board and it worked, i do get a weird noise that constantly fades in and out of the right ear, its annoying when nothing is on, but if something is playing i cant really hear it, ill have to look into that later.
I assume you got the LED part dismantled if you say you have done testing and such.