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Hello, Sorry you're having problems. Offhand these symptoms would point to a failure in the Convergence circuit of the TV (which is what keeps the 3 color tubes aligned when viewing). However, it would be worth trying another source like a DVD player on the set to make sure it's not the specific Comcast box connected to this set.
Additionally, the model number of the TV is not posted - but given the age of the set I would assume it's a large back rear projection.
Please try a full reboot of everything as follows and let me know if you have the same problem:
1) Shut the TV off and pull the power cord from the wall (unplug it).
2) Unplug your cable box power cord from the wall for 20 seconds and plug it back in.
3) Plug in the TV and then turn it on.
4) Let me know if the image comes up the same.
If it DOES, then I will need the full model number off of the back of the TV please.
Please review my reply and try those steps to proceed.
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Are you able to reply back with what the results of the reboot are? I'm here awaiting your reply but have to leave at some point soon.