Have a NEC NP50 that just started having a white (or "no color") vertical stripe down, just inside, the left side of the screen. With no input source, it just shows the background color initially. But if I go in to the menu the white stripe is there. When first start up, the stripe is flickering, but after a minute or two it is solid and shows on all screens. Any ideas what would be causing this? And is it a DIY fix, or a service center repair? Thanks.
SOURCE: White vertical line on left side of screen
Hi there
This problem can only be fixed properly by replacing the Mainboard.
SOURCE: White vertical line on left side of screen
omg, I just figured out why OUR projector was doing this! There was an adaptor plugged into it that we use to hook it up to cable to watch games/tv shows sometimes...once I unplugged that from the projector the lines dissapeared!
SOURCE: HItachi cp x1250 blue tint area on black background
Your LCD pannels need to be replaced, good luck.
SOURCE: even spaced vertical lines across the whole screen on all sources
If you are handy with SMT rework it might be possible to fix this problem. The heat spreaders on the LCD drivers are insufficient to cool the chips and they will get hot enough to reflow the solder and cause a short on some of the pins. I think it most often happens after bulb replacement since bulbs near their end of life are dimmed and run cooler. After replacing the bulb the bit of extra heat is all that is needed to push them over the edge.
The problem also seems to be most prevalent on the green IC since it shares a heatsink with red and has a smaller area to dissapate the heat into.
If you pull the heatsink you will probably be able to see the short with careful inspection. The pitch is very small - 0.6mm but I was able to wick, clean, and reflow one side of my green IC and the problem went away.
I am planning on adding some additional aluminum stock to the heat spreaders with some thermal adhesive to give the chips more cooling.
By the way the very common rattle noise in these projectors is not a fan but the auto iris. You can unplug the iris servo from the mainboard and disable the auto iris in the menu to work around the problem or you can replace the iris servo for about $75, again, if you are handy with that sort of thing.
SOURCE: Half inch crystal/ solid white vertical line on screen
Adjust the horizontal in the menu then try the overscan adjustment. If the image does not look dim you do not need a lamp.
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Also, went in to menu and did Reset All, with no effect on problem.
It is a projector - are you suggesting hooking up an external screen to the "pass-thru" VGA?
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