When your TV says "mode not supported," it usually indicates an issue with the HDMI connection. To fix this, you can try the following steps:
1. Verify and change to a supported resolution.
2. Plug out the HDMI cable and plug it into another HDMI input on your TV.
3. Try using a different HDMI cable.
4. Soft reset your TV and the source device.
5. Update the software of your Samsung TV (if available).
6. Perform a factory reset on your TV as a last resort.
7. If the problem persists, reach out to Samsung support for further assistance.
By following these steps, you should be able to resolve the "mode not supported" error on your Samsung TV.