Without a schematic of your circuit I can only take a SWAG. Since this happened on two seperate units it is highly unlikely they both are bad but it is possible. It sounds like low voltage to the LEDs. Check the VCC to ground voltage at the module terminals, also check the Led_Con voltage. VCC needs to be at the logic level voltage of your microprocessor. The TCS230 operates on a supply voltage of 2.7 to 5.5 volts and provides TTL logic-level outputs. To help us help you better include a schematic of how you wired it including all power and ground connections and poser supplies.