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Nec vt470 projector half the screen has shadow

New bulb show shadow on hal hte screen

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Is it normal for the NEC VT470 to get hot?


check that the cooling fan is operating correctly and the air flow is not been blocked off

Jun 22, 2013 | NEC VT470 Multimedia Projector

1 Answer

NEC vt470 projector suddenly not turning on


I'm with Greg on this, I've had both of those problems individually on different VT4xx's (having both a number of them and a working knowledge of screwdrivers, figured out what was up by process of elimination). Sometimes bulbs die early - if it's really early you might want to see if there was any warranty period remaining on it - and the power boards in these projectors do sometimes break down. They were built in an at-risk period for having troublesome power capacitors installed into them, for starters...

If you are e.g. at a school which has several of these projectors issued to individual teachers, organise to swap the bulbs over between both your units and see which, if either of them, still work afterwards. If theirs was originally working, and after the swap, both are dead, you've got a dead bulb AND something else wrong with the projector, POSSIBLY but not necessarily that PCB. If yours then works but theirs doesn't, it's the bulb. And if there's no change, then both bulbs are good but your projector is toast.

And if it turns out that it's a projector fault, unless either you or an in-house tech can investigate and do the fix either for free or very cheaply, it's probably not worth getting it repaired. These models are really quite old and under-spec these days, and you can replace the entire thing with a brand new model of similar specification - with a working bulb installed! - than it would cost you to buy a single replacement bulb for the NEC.

Nov 08, 2012 | NEC VT470 Multimedia Projector

1 Answer

Haze


Rather hard to properly diagnose this one off such a short description, but...

1/ Bulb OK, not over hours or otherwise damaged?
2/ Is it constant for all images, just a general coloured haze, not a strange "shadow", "ghost" or "fringe" that alters depending on what you display?
3/ Lens nice and clean?
4/ Surface you're projecting it onto also clean and at least nominally white?
5/ Input cables all fine at both ends and work correctly with other output devices (TV and/or computer monitor)?
6/ Haze still in place with different cables and input devices?
7/ Does the projector regularly show the same static image for extended periods?

The VT460s were buggers for suffering from internal LCD and filter glass issues if allowed to overheat, and with image burn-in, especially if fitted with unusual lenses (e.g. extreme short-throw); I've had to do internal cut-and-swap surgery on a few of them before, with donor image elements from projectors that died due to other problems. I can't say the one VT470 has shown any sign of similar, but the two VT480s are worse if anything. So it's entirely possible that we just got the one good VT470 out of the whole production run. As intimated by the above, it could be anything out of a failing bulb, dirty lens (or internal image element) glass, image burn-in, LCD/filter damage from overheating (and mind that being turned on showing a "blank" screen for ages can cause a similar effect, as all of the bulb's 200 watts of light energy is then being completely absorbed by three thumbnail-sized pieces of liquid crystal... the bulb doesn't turn off unless the projector is shut down completely!), problems with internal circuitry, dodgy cables, unsuitable projection surfaces, or problems with the devices feeding images to it. It really is a minefield until it can be narrowed down.

May 11, 2012 | NEC VT470 Multimedia Projector

1 Answer

I have an NEC VT470. The projector shut down after the lamp finished. When I replaced the lamp and pressed the start button, the projector does not come back on.


Some of the NEC units have a standby status when the lamplife has exceeded its safe limit, the unit I had needed the off button pressing for up to 20 seconds to reset the lamplife and allow the unit to be switched back on. There should be info for this in your manual.

Good luck

Jan 14, 2011 | NEC (VT75LP) Projector Lamp for VT470,...

1 Answer

Hello, We have an NEC VT470 Projector serial#5700853UG Mfg 7/2005 and it works great! My problem is that our PC died and we replaced it with a MacBook Pro Laptop and there was not a direct connection to...


Have you selected the correct display on your computer as it will need to know to send display to external screen?. I assume your pc was a desktop, not a laptop.

Apr 02, 2017 | NEC VT470 Multimedia Projector

1 Answer

I have a multimedia projector NEC VT470 and is getting red picture.


If you are using the vga input connection please take a look at all the pins and make sure none are bent this could be the reason you are missing one of the primary colors. If not check your cable pins.

Jun 04, 2010 | NEC VT470 Multimedia Projector

1 Answer

Nec vt470 lamp does not come on. replace lamp, when turned on status light turns red and get 3 beeps. lamp does not come on.


If you replaced the lamp already, chances are the ballast is defective. When you power on the projector with the power button you should see a flicker of light in the lens, or an electrical sound. If you don't you ballast is bad.

Apr 19, 2010 | NEC VT470 Multimedia Projector

1 Answer

I have a yellow shadow line around my black letters. Is there an alignment that an in house tech can adjust?


normally there is a description in the user's manual for the alignment (convergence) of this machine.

Mar 08, 2010 | NEC VT470 Multimedia Projector

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