I represent ASA Electronics, the producer of the JENSEN brand of televisions, stereos, and speakers and the Voyager brand of observation monitors and cameras. At ASA, we strive to provide excellent customer service and product satisfaction and would like to offer some assistance in this matter.
I would recommend that you try pressing the reset button. It is located to the left of the AUD button. You will need something small, such as a pen or pencil in order to depress it. It only takes a moment. Be sure to do this with power applied to the radio. See if that corrects the issue.
If the trouble persists, have your dealer check to make sure there is at least +12V DC available on both the RED & YELLOW power wires. If the voltage is low, correct the voltage, press the reset button and then re-test.
Please let me know if you need any further assistance.
JENSEN and Voyager Tech Support Team