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If you are comfortable taking the back of the TV (and know your way around high voltage electronics), chack that the connection between the CRT pins and the socket (likely there's a small circuit board with socket at the end of the CRT neck) are still good. Gently unplug and replug in the socket (check that there's no glue or such holding it). Don't force it, you don't want to break a CRT (wear googles and other personal protection just in case). Other connectors may need to be unplugged and replugged in. What this does is remove any corrosion inside the points of contact inside the connectors.
Other possibilities are bad solder joints. Check that board on the CRT neck, and other points where there is decoded RGB video.
At this point you might start shopping for a new TV....
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