I have a Samsung UE50NU7400 which had been quite happy connected to my Pioneer VSX-S510k reciver via ARC for over a year.
I've upgraded to the VSX-S520d which is a newer model and all was good for a few hours until the Samsung TV now will refuse to reconise the receiver for audio via ARC. I have got it to work briefly again after factory resetting both the TV and Receiver only for it to happen again. I'm not having to use a optical link to get audio from the TV to the receiver.
I know the new receiver is ok as I've had it running off another tv with no problems. Any ideas as my Samsung TV has literally expired warrenty wise. And I'm thinking it's more of an issue with the tv over the receiver.
Thank you so much for reaching out! This forum is for the support of US products and customers. We do not have the ability to support models outside of the US. There are differences between the US and International firmware, which we do not have access to. Since your device was purchased outside of the US, please visit the link below for support in your area. http://www.samsung.com/visitcountry