If the latching mechanism on the switch itself is faulty, then it's probably going to require replacement. The problem with these is that not every switch is the same. There are many monitors and TVs that use these switches, and there are differences in the mountings, pin spacings, shaft lengths etc.
If it's soldered to the PCB, it will probably be something SIMILAR to
this series.
Or, it might be on a flying lead. The possibilities are endless.
Another source (other than your local friendly TV repair guy) is Donberg:
http://www.donberg.ie/catalogue/mechanical_components/mains_switches/
Sometimes, fixing the latching mechanism (often a small U shaped metal piece that follows a groove on the top of the switch) is possible.
The work around is to jam the switch like you've done, or hard-wire the switch to the ON position.
Good luck!