if you are using a VIDEO or yelllow wire make sure this is in securely ,if you are using a S-VIDEO wire check the pins or connection.
If the TV is only using coax cable you may want to power the tv down ,remove all screws.UNPLUG TV from power please-
Take a flat screwdriver and discharge the tube by running a 8 guage wire to the silver part of the tv screen in the back,it will POP this is normal ,next remove the suction cup from the tube ,you should be safe. resolder anything that looks bad on the PC board.
John mayer, August 2005