I had something similar to this happen when I was building an LCD projector, what was going on with me was the thin ribbon cables that go from the LCD screen to the PCB were shorting out/making poor contact. For me it was due to the position of the PCB, but in your case the ribbon cables my be coming unglued from the LCD because of heat or age, or both. This instructable https://www.instructables.com/id/Repair-a-Malfunctioning-LCD/ shows how to fix that.Another thing that could be happening is that the controller board is crapping out on you, open up the projector and see if there are any capacitors hit with the capacitor plague or the like. If it's a really nice projector, then you might be able to find a replacement controller board on eBay, they have quite a few. Otherwise with some searching you might also be able to find a replacement LCD panel. Hope this helps!
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I just looked on eBay right after I posted this, there's a Philips Proscreen 4600 with a bad power supply for cheap http://cgi.ebay.com/loc1-PHILIPS-PROSCREEN-4600-PROJECTOR-parts-or-repair_W0QQitemZ260442028733QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ca38dfabd&_trksid=p3286.c0.m14&_trkparms=65%3A12|66%3A2|39%3A1|72%3A1205|293%3A1|294%3A50 although shipping is a killer. You could get that and use it for replacement parts.Sorry for the double post.
can't be helped, buy a new one
or makbe get another cable to hook up the projector to your dvd player/computer/etc
post a picture!
Here are two pictures of the vertical lines. For a while the lines would go away if I pressed on the top or sides of the projector, but now they're not going away. I found online where someone said it might be the controller board. Of course buying a new one would be the best solution (I would not have posted this if I was just going to buy another one) but I was hoping there was someone out there that would have some possible solutions to fixing this.
it's either the controller board of the LCD display
how old is the projector?
It's an older projector, not sure the year. I figured it was the controller board (as I mentioned before), or the LCD. I've tried all of the different possible connectors (VGA, video, s-video), and it's the same on all of them.
it would be easier to buy a new projector, sorry