I have a AV-N29220 TV. 3 days ago the image change to very small, as an horizontal line ( 1 inch aprox) with sound, i turned off and after one night the TV sterted work properly. today in the morning the tv. started again having the same problem. I turned off and turned on and the problem still. I softly hit one side of the TV and the image changed to Normal for a short period of time. What could be the problem? Thanks a lot

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