Question about Sony UBP-X500

Hello everyone... I have a question about this device. I have the following problem: I use this player with a Samsung TV (Q85R). As soon as I activate the extended signal for the HDMI connection (necessary for HDR), the picture remains black. If I switch it off, everything runs without problems, simply without HDR. But this is more than unsatisfactory for me. Does anyone know this problem? Greetings