Hey there! @Raphy123, Welcome to the Community! :slight_smile I’m sorry to hear that you are having issues with your TV, I’d be happy to look into your concerns. ST TV Compatibility varies by model and region when you mentioned that you only have the option to cast. Can you please elaborate further on if the device shows up in your list of devices in ST App or as a ‘Directly Connected Device’? As mentioned it varies by Model, Can you please provide me with the model code of the TV and the region you are located in?
The easiest way, you can look up the model number of your 2015 Samsung TV is in the TV menu options.
Go to settings Menu > Support > Contact Samsung > the Model Code field will show the TV model.
Useful information: Newer Samsung TV models from 2016 onwards use this pathway. Menu → Support → About this TV.
Additionally, If you have access to the back of the TV, you can see the model number of the TV on the information label.
I’d recommend checking to see if the Model code of the TV is listed as a supported model, You can do so using this troubleshooting article: Set up SmartThings on your Smart TV
If the model code does not populate under supported devices, you may need a 2018+ model TV to acheive the capabilities.
I hope this message finds you well!