Disclaimer; I didn’t actually do this, I bought the logic board on eBay after a lovely chat with the previous owner.
notes:
My 400mhz Indigo is of the summer 2001 variety I think. It has the single white power LED. The logic board came from an early Ruby DV, apparently, and would have expected a green/amber bi-color LED. As such, the power LED simply doesn’t work.
The swap was performed by @dosdude1 and works great! Worth noting that it wouldn’t work for a late 01 chassis with a 600 or 700mhz cpu, as those have the heat spreader in a different location. I don’t know the tenability of a cpu swap on those boards, outside my area of expertise.
The LEDs are SK6815 RGBW 12v strands controlled by an ESP32 running WLED. I removed the iMac’s modem and ran the WiFi antenna for it outside through the jack hole, all reversible.



notes:
My 400mhz Indigo is of the summer 2001 variety I think. It has the single white power LED. The logic board came from an early Ruby DV, apparently, and would have expected a green/amber bi-color LED. As such, the power LED simply doesn’t work.
The swap was performed by @dosdude1 and works great! Worth noting that it wouldn’t work for a late 01 chassis with a 600 or 700mhz cpu, as those have the heat spreader in a different location. I don’t know the tenability of a cpu swap on those boards, outside my area of expertise.
The LEDs are SK6815 RGBW 12v strands controlled by an ESP32 running WLED. I removed the iMac’s modem and ran the WiFi antenna for it outside through the jack hole, all reversible.



