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Its a old set but hookup should from a DVD player be to the rear audio and video inputs---note color of jacks on player--you will need for that old set composite--yellow(video and color), red and white for sound.
If the player does not have them (composite) you have a real problem.
Once connected use the input button on the front of the set to change to that input that you hooked the player up to (video 1 or 2 etc.)
I'll take a guess here that the lines are at a slight angle. I believe that these are "retrace" lines and are an indication that the flyback transformer is starting to fail. The vertical IC would cause a collapse of the picture and bad caps in the circuit would effect the linearity of the picture. You can check for poor solder joints as they could cause any nunber of symptoms.
The best place for board repair or replace is PTS 1-800-844-7871
Yes you would need to fill the CRT's fluid level back up. The liquid is Glycnol(Liquid anti-freeze) Poisonious yes is swallowed! So take precautions. You can get if from places like MCM electronics, Tritronics, bluestar-online.com, etc. It's called CRT coolant fluid. Yes and you would need to fix leak, probably a gasket or seal. Hope this helps!
Sounds like the Horizontal Output Transistor shorted. TVs are dangerous to work on if you are not trained. The transistor can be checked easily with a dmm. If it is bad the flyback should probably be replaced too. If it is ok, you have a short somewhere else and need to isolate systems until the fuses quit blowing or hook it up to a variac and do checking to see where the short is. My bet is on the HOT. Again, if you are not qualified have a professional look at it. Good luck.