Not a TV Technician, use the following information at your own risk. Two things you can do first: using the keys on the front of your set press and hold the menu button when while holding it down it goes from menu to channel listing press the adjust (<->) and channel up buttons simultaneously to get to the factory set up screen once there use the select button to scroll to next set up screens locate the contrast it should range from 1-63 find the one you like. Second: for the horizontal lines not to say that this is the solution there are two adjustment apparatuses inside the TV chassis if your familiar with taking the set apart and not getting shocked and hurt

two dials on the fly back transformer ones for focus the other brightness you can try these fixes but I have to say again that you use at your own risk. I do hope though that the information is useful
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