Zenith System 3 Issues

[OS X]

Hi, I just bought a Zenith System 3 from a local thrift store because it is a perfect mach with my 80's Zenith VCR i was useing a 1993 RCA for watching VHS tapes before i got this. This is the issues it is having when i tested it there it had not the lines on all ch.'s but some did (They have basic cable) so i bought it thinking it was just there cable. when i got home i cleaned it out (boy was it full of dust) and to my disappointment i pluged it in to my directv box and it did the same thing on ch. 3 and 4 and to ad to that the picture has got the shakes i paid $10 so it is not too much of a loss but if it is something easy to fix i want to try it i never repaired a tv before so it would be a good learning experience i just have a funny feeling that it is the flyback going or the crt it had such a good picture at the store ): any ideas would be helpful thank you The model is SA1927W

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