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Hi glazer0001, We appreciate you sharing the issues you’re experiencing when connecting your TU690T TV to your cable box. Please go to the Connection Guide for details: Source > Connection Guide. Make sure that your external device is connected securely and turned on. Move to Sources to switch to other input sources: Source > Sources. Using HDMI Troubleshooting, you can check the connection to HDMI cable and external devices (takes approx. 2 minutes). Source > Connection Guide > Video Device > HDMI Troubleshooting, If you continue to have issues, please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website. ~ Samsung Advisor
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