I have a ceiling mounted NEC LT240K that is connected to a 20' VGA cable and a dvd player via RCA cable. I have recently had an issue with the IR remote losing functionality while the projector is in use. The most recent event consisted of powering on via remote, a picture mute via remote after an hour of use and then the user was able to un-mute. The remote was also unable to power off or select the menu, but the laser pointer functioned and the batteries were fresh. I happen to have another LT240K remote to try and that one also didn't work. I checked the menu setting that allows you to enable/disable the projector IR sensors and all 4 sensors were enabled.
The last time this happened I tried reverting to factory default and the remote worked again. I have no custom settings other than the ceiling projection and a 5 hour power down.
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Do you want to duplicate the image going from the source to the projector on your TV? If so, then if your TV has a VGA port, just use the monitor Out on the projector. If your TV doesn't have a VGA port, you'll need an appropriate converter. (Avoid a VGA to component video or VGA to composite cable.) If you add a comment with more information on the inputs for the TV (or the model of the TV), then I will try to point you to the correct converter.
If you want to get your TV signal to the projector, you would need a set-top box (cable, satellite, digital tuner) as the source. Most TVs do not have a video output. You can connect a computer or DVD player to the projector.
it depends how you connect the DVD to the projector.
the projector itself has only one speaker (mono) - not so good for movies.
the "audio in" is a mini stereo plug (same as headphones).
you will need a RCA to mini stereo convertor - red/white (or red/black) RCA to mini stereo plug.
or you can connect a RCA to RCA (red/white to red/white) cable to an amplifier which is connected to speakers.
or just plain speakers, but you'll probably need a convertor cable from RCA (red/white) to a female mini stereo plug).
these cables are pretty cheap and can be bought in any Radio-shack.
hope it helps....
Phone NEC and get them to swap it over if it is under warranty. They are very good like that and you will have a replacement next day via TNT. Take out the bulb and keep hold of all the cables and remote as they will send you the projector only. Put the faulty one in the box and send it back. TNT will collect it and it is part of the returns policy. No cost involved.
Check the green signal lead - if one of the RGB leads doesn't make good contact, the picture will take on an odd tint that doesn't always look like it's missing one of those colours. For some reason, the green is always the most common one to fail.
A great deal of the time DVD players are very restrictive on outputting to multiple sources due to copyright protection. In my experience, if you use your laptops function keys to toggle output (For example, on my laptop, I hit FUNCTION + F4 to cycle between LCD,LCD+VGA,VGA), you should be able to disable the laptop's LCD display, only outputting via the VGA cable. It's worked for me with my HP VP6111 and Windows XP in the past.
Hope this helps!