If the display only shows the time and none of the other functions are working properly, it could be related to either the remote or the radio itself. Since the volume controls work using the remote, it's possible that the remote is still functioning partially. However, if other functions like the tuner and radio aren't working, it might indicate a problem with the radio unit itself. Before jumping to conclusions about needing a new remote, you could try a few troubleshooting steps. First, make sure there are no obstructions blocking the infrared receiver on the radio unit that could be interfering with the signal from the remote. You could also try resetting the radio unit by unplugging it from power for a few minutes and then plugging it back in.