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These lines are called vertical retrace lines, and caused by the video output section; or improperly set screen voltage. All of these type of lines will be a little slanting type, across the screen all over, with an approximate one inch apart to each other. If you wish to get more details, check this link. http://electronicshelponline.blogspot.com/ Selecting the view option, either to Mosaic
/ Time slide, can be selected by the drop-down list, at the top left
of the display window, will make surf easy. You can also do a search, by type in the brand name/model
number/IC used, in the search box at the top right of the display window.
This is a problem with the vertical circuit and because it "repairs" itself, sounds like either a poor solder connection or a failing capacitor. This is a fairly common problem that is easily resolved. If you have repair experience, you can fix this yourself. Please verify the model number and whether or not you plan on attempting the repair and I'll supply additional details.
OK I got my first TV, first to repair myself that is, and I have no training at all but am kind of a tech dork wannabe. So I checked and I have sound but no signal through the TV tuner, so I hooked up my Zenith VCR to aux 1 and sound with signal appeared, the VCR tuner still works :) so I am leaning toward the TV tuner. It is visibly damaged, and I'm hoping it is as simple as a broken connection. I also noticed a vertical flash and pattern of horizontal lines when it is turned off (white). sooooo I push on.... help!!!!!!!!!!!!! :>}
help is here. back off that screen control tell them lines go away.
you have these things working Powersupply, Vertical, High voltage, sound, leaves video problem , go the the video circuit on schematic and find the video out transitor or ic or whatever they use, check to see if proper voltage or better yet see if got video with a scope, I see allot of shorted video out transistors.
also check and see if you can inject video with a vcr out to the tv in.
Do a complete overhaul of the regulated power supply===solder any/all bad connects,replace any weak capacitors.HB Electronics kit #103-088
will help you locate which parts go bad===get on it before it crashes hard!