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Hi, Symptom shows tv got problem with green picture tube that need to be replaced. Rear projection tv has 3 picture tubes, red-green-blue to make color picture. Since its an old model so spare parts would hardly be available and local tv repair shop will help you to arrange required part, if they can. Thanks.
2 things that will cause that vertical IC or Yoke! Listen to this one went on service call 2wks ago Customer had a 50 INCH1988 pioneer big screen replaced 3 capacitors resolder poor connections TV is now working like New ?
Can be 1 of 2 things. 1st the red tube just needs the voltage to it turned down. In the front of TV (you have to remove the lower front half of TV to access it) is a plastic square with 6 knobs. The from left to right top knobs control focus for blue,green red. The bottom knobs control voltage to each tube in same order (so lower right knob for red) turn SLOWLY to left to reduce voltage until excessive red and lines go away. If you over turn left or right set will turn off. If that does not fix it or if lines reappear then option 2 is that red picture tube is failing outright and needs replacement.
Replace Both STK convergence ICs will have part number on them STK392-560 use same part number on your STKs. Also around ICs ck pico fuses 5/6amps they are green or yellow.
It a picture tube issue or a crt driver issue. Not something a layman can repair unless they have the training as well as the equipment to repair solid state TV sets.
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