... please tell me as well if you agree that it should work.
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The on board RGB LED requires a supply voltage higher than 2.7 V to function correctly. Ensure that SW5 is set to the 3.3 V or 1.8 V–3.3 V VARIABLE with PSoC Programmer selecting a voltage of 2.7 V or higher in the latter case. Using this kit with voltage lower than 2.7 V will affect the RGB LED operation.
Thank you very much for your help. Indeed the switch SW5 was set to "1-8-3.3V VARIABLE" (lowest position) instead of "3.3V" (middle position).
Now it work fine. Thx a lot.