Television and Home Theater

I have a Toshiba Blackstripe TV that I got in 1990 - amazingly it works great... EXCEPT it skips from channel 48 to 93.  When I got it, there weren't any channels between 48 and 93, and I think it set up its channels at that point but I don't have its original remote anymore to try and "reset" it. 

Now, of course, I have channels that I'd like to watch between 48 and 93.  Any suggestions how to get it to recognize the channels?

 My 42 inch hitachi Ultravision LCD tv has developed green streaks on the picture noticible with light background. I read a forum that dust on the lens may be the problem. I cleaned the lens cover and did a good inspection of the compartment and found no problems. I read that there is a hidden repair menu that can be accessed by a sequence of button pushes. Reset the green something or other. Does anyone have any suggestions. It is a 42V715 hitachi ultravision LCD.

My 28"  jvc tv shutdown reacently and just tripped on switch on.The lopt transistor was dead short which i replaced checked for dry joints,switched on and to my horror an e/w fault and a narrowish picture appeard.Lopt transistor remained fairly cool and after 10 mins or so it went back to tripping with dead short lopt transistor.I could not find any other dead shorts or open circuits.Any advise would be appreciated.thanks