The last days I thought about adding a WS2812 strip (RGB LEDs) to my GH60 rec v.
Maybe someone have this allready seen on the GH60 satan PCB:

The QMK firmware should make this possible:
Satan QMK: https://github.com/a0-c/qmk-satan-rgb
And for GH60 Rev c: https://github.com/jackhumbert/qmk_firm ... gh60_rev_c
In another thread the possibility was also discussed, but without any solution: https://geekhack.org/index.php?topic=82427.0

The QMK firmare should make this possible, the data pin must be added to the unused pin B0 at the controller,

but have somebody a idea where I should solder the GND and VCC (5V), maybe also at the controller?
And what are these solder joints at the GH60 PCB? The GH60 satan PCB have 7 solder joints at this place. Have anybody a idea?

Great news, it worked, I have here now a GH60 Rev c with working LED RGB underglow. First I tried to modify the qmk gh60 rev c firmware, but it didnt worked, then I tried to modify the satan qmk firmware and now it works.
used firmware: https://github.com/a0-c/qmk-satan-rgb

I soldered the LED strip to VCC, GND and PB0 at the controller. Then I changed the used pin in the config and it works now. Currently the keymap is not fully working, I need to fix some keys with the right inputs, but in general it works. I will fix the next days everything and will uploade the firmware (hex file) then. If somebody wants to test it here is the hex: http://www.filedropper.com/satan

After a second flash, the keyboard stopped working (the rgb stripe) not. Now the homerow triggers multiple keypresses, but the alphas not longer work, can somebody help me?

I would double check the points for the controller, and triple check the row and column entries for your keymap.