To fix a Samsung TV when it says "mode not supported," you can follow these steps:
1. Verify and change to a supported resolution.
2. Soft reset your Samsung TV and source device.
3. Update the Samsung TV software (if available).
4. Replace the HDMI cable.
5. Factory reset the Samsung TV.
6. Reach out to Samsung Support for further assistance.
If you encounter the "Mode not supported" error message on your TV, it is likely an issue with the HDMI connection. You can try unplugging the HDMI cable and plugging it into another HDMI input on your TV to see if that resolves the problem.