tbuccelli

This is an older television and I have not been able to find information through searching or the manuals. The TV no longer keeps the time when turned off. Every time I turn it back on, I get the message that time has been lost due to power interruption, or something similar. This message stays on the screen for a minute or two. The TV is not getting unplugged, just turned off. Is there some internal battery / capacitor that can be replaced? I did replace the power supply board about 5 years ago, and have done a bit of soldering in the past, so I am not concerned about that - I just try to avoid the areas that say "high voltage" on the schematics. Hoping it is something as simple as a battery, though thinking probably not.