Using the remote control, simultaneously press and hold the F button together with the MUTE button until television is unlocked. Result will be RED padlock disappears and picture will display normally again.
mikeadams110 at yahoo.com
Mike Adams, January 2011
hold down the F button and then press the MUTE button untill it comes back on.
Now does anyone knows where I can get a new remote for this tv
M., December 2007
edit
I can answer this question...
TV classic ctv locked, red key bottom left, how do you unlock?