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Prime Z390-A (12V) to LEADEX III Gold ARGB (5V) lighting question

Level 7
My build:

  • MB: Asus Prime Z390-A
  • CPU: Intel Core i7-9700K Coffee Lake 8-Core 3.6 GHz
  • CPU Cooler: Cooler Master MasterLiquid ML240L RGB V2, Close-Loop AIO CPU Liquid Cooler
  • RAM: G.SKILL TridentZ RGB Series 32GB (2 x 16GB)
  • GPU: GIGABYTE GeForce GTX 1650 SUPER WINDFORCE OC 4G Graphics Card
  • HD: Samsung 970 EVO Plus SSD 1TB - M.2 NVMe
  • PSU: Super Flower Leadex III ARGB 80+ Gold, Addressable LEDs with 5V Motherboard Sync/Analog Controlled (650W)
  • KB: ROG Strix Flare w/ Super Silent Red Cherry keys

Since the Asus has 12V RGB-Ground 4 pin connectors, and the power supply LED connector is a 5V 3-pin, I've added in this "EZDIY-FAB RGB Converter" that's supposed to convert 4 channel RGB to 3-pin ARGB.

So far, no luck. The connector coming out of the MB is working fine (splitter going to some fans confirms this).
Any ideas / has anyone else made this work with SuperFlower ARGB PSUs? It's the last piece to sync up.
Thanks and Cheers!