🚀 go-pugleaf

This sounds rather simple but I'll mention it anyway.

First, replace the circuit breaker.  I repaired TV's for about 7 years
while going through school and I've learned that they *do* go bad without
something else causing it to go out.

You didn't mention how old your set was, if it's solid state or tubes
(yes, some people still own them).

Also, quite often, something could heat up and short over time.  Most often,
it is usually something in the horizontal sweep circuit (no guarantees).
With tube sets, it's common for the horizontal sweep tube to short with
high temperature.

With solid state sets, something in the sweep circuit could short with
heat or the horiz sweep transistor could saturate, due to it's driving 
circuitry.

With more information on your particular set, we could probably give less
general advice on possible sources of the problem.  I didn't see leaky capacitors causing the problem in nearly all cases though.

'Good luck,
barry