SER FAQ: TVFAQ: On-screen clock runs slow or fast

S.E.R. FAQ

NotTaR of Television Sets : On-screen clock runs slow or fast
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On-screen clock runs slow or fast

If the TV was purchased in another country (most likely it is a "multi-system TV), then the power line frequency may be different. There could be a switch or menu setting for this.
If the clock reference is power line derived, noisy power can sometimes result in erratic timekeeping though running fast is probably more common than running slow. This could be a result of a lamp dimmer or compact fluorescent on the same circuit.
If the time reference is a separate crystal, that or its circuit could be faulty.

Now think about it: Do you absolutely need the TV's clock??? After all, there are probably a half dozen other clocks in the same room! :)