This is from our lead engineer:
Resistor values for a BLUE ICE 105 key keyboard w/ RED status LEDs:
R9, R10, R13 = 100 Ohms, 1/4W, 5%
Resistor values for a RED FIRE 105 key keyboard w/ blue status LEDs:
R9, R10, R13 = 330 Ohms, 1/4W, 5%
These values assume the current, voltage and optical characteristics of the TG3 LEDs. Results will vary with non-TG3 supplied LEDs and possibly could damage the electronics that drive these status LEDs.
Changing the status LEDs requires disassembling the keyboard, unsoldering and resoldering new components. LEDs are polarized devices and can be installed in one of two orientations; they will work installed in one orientation and won’t work in the other. The polarity of the red LEDs is opposite of the blue LEDs; so if you swap them, you need to rotate them 180 degrees before reinstalling them. I suggest trying one before doing all three.
To change the status LEDs from red to blue or vice-versa, use the component values shown above.
So if you want to install blue TG3 status LEDs on your blue ICE keyboard, R9-R11 should be 330 Ohms.
If you want to install red TG3 status LEDs on your red FIRE keyboard, R9-R11 should be 100 Ohms.
It is possible to change the LEDs without changing the resistor values, but then the brightness of the status LEDs won’t optimally track those LEDs used for backlighting the keyboard. With a USB interface, the reported current consumption data sent to host system may not match the actual current consumption.