I did not understand why, when my TV was off, I had a rainbow effect with my Ambilight. I thought it was normal. Today I decide to remove this static effect, not beautiful. By dint of searching I realize that it is not a problem of programming because Hyperion is not planned for that. By making a video capture via HyperCon I see that ... there is a signal "rainbow" sent to the Raspberry! Now, how to correct this problem because I do not know who produces this image. Hardware : Splitter HDMI (Amazon - 16,99€) Converter HDMI to RCA (Amazon - 13,99€) Grabber USB chipset UTV007 (Amazon - 14,69€) Raspberry 2B Connections : All my video sources are connected to my home theater amplifier. The signal comes out and goes directly to the HDMI splitter etc My TV (Philips) works with the CEC protocol. When I turn off my TV, I turn off all other devices at the same time and all are in standby. Question : The question is : where come from this signal and how i can desactivate Hyperion when i have this signal screen. Thank you. P.S Impossible to upload image with the forum's function.