Good morning .. I have a problem with my tube TV29 Admiral. When I turn it on, the small image appears, by two horizontal black stripes (above and below the image). When it warms a little, the image is enlarged a little but the two black stripes remain. I am not a technician. I have notions of electricity and electronics. What can it become and if you can populate or change something? Thank you

Hello Friend. change the filters that are related to the ic. vertical and solved the pins of the same ic. vert. and solve the flayback pins. regards