Question about NEC MultiSync MT840 Multimedia Projector

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I have a multisync mt840 in my work shop

This Projector always looks out of focus the lamp life has 1700hr left

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What is the resolution set at on the laptop/pc connected to the projector? The native resolution for this projector is 800X600 and the max is 1024X768.

Posted on Oct 25, 2007


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1 Answer

Out of focus

the glasses in the Lens are failing.the glasses were burned
you need the new Lens, USD80
any questions, feel free to contact me
We supply original projector lamp,bulb,accessories,Lcd panel,Lens,DMD chip,color wheel,motherboard,powersupply,ballast... with high quality and competitive price.
have a nice day!
Jerry,Lampdeng Limited

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Vivitar 3000af slide projector

While I am not sure of this feature on the Vivitar projectors, extensive testing has proven that running the cooling fan to accelerate cooling of a projection lamp will significantly shorten the lamp life. It is always recommended that (if possible) the projector system is cooled to room temperature without the fan running. Also, it is recommended not to move the projector until the lamp is completely cooled, as the lamp filament is extremely fragile when hot.

Jun 29, 2013 | Office Equipment & Supplies

1 Answer

How to check lamp timer

Bulbs do not really have a certain lamp life they only have a lamp timer. You will want to be sure you can get a replacement lamp they can go anytime between 0 and 6000 hours.

Apr 22, 2013 | Mitsubishi SL2U Multimedia Projector

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Hello i recently bought a MT70lp lamp for an NEC MT1075 projector, the lamp module has been re lamped, so it has a new reflector and arc tube but the chip on the lamp has not been reset so the projector...

Hi Anthony,
I have come across the same issue. Have you had any luck? I am looking to do the same with another Globe for an NC800. Does your chip look like this?


Jun 21, 2011 | NEC MT70LP Projector Lamp for MT1075

1 Answer

Hello, im looking at buying a second hand projector, how do i find out the life of the lamp? can i look in the menu? if its on it last legs, and only got a few mouths of use left in it, are there still...

you can view lamp hours in the menu. Keep in mind, however, that there is also a reset for the lamp hours, so there is no way to know if the reading is accurate or not.

lamps can be purchased at:

As you can see, new lamp is probably way more costly than what you are paying for the projector. Why not just purchase a newer, better projector for same price as replacement lamp?

Aug 18, 2010 | InFocus LP650 Projector Lamp

1 Answer


let it cool down then remove the lamp and see if it looks shattered or burnt- if it is you have solved your problem-change lamp!

May 27, 2009 | NEC (50019497) Projector Lamp for VT440,...

1 Answer

Display is faded and remote not working properly

Despite the "hours left" on your projector, the lamp could be nearing the end of its life. Recommendations:
1. Make sure the vents and filters (if applicable) are clear of dust and debris.
2. Make sure the projector is well ventilated. (i.e. no obstructions around the vents)
3. Replace the lamp. They're around $200 on eBay. After replacing, reset the lamp timer (see your manual).
4. After replacing, run the projector in eco-mode if the brightness is acceptable. This will extend the life of your lamp.
5. Always let the projector cool down before unplugging the power or turning the master power switch off.

I don't know what would cause the inability to access all the menu options.

Hope this helps somewhat.

Apr 20, 2009 | Audio Players & Recorders

1 Answer

Optoma H31 - Turns itself off !

sounds like the projector lamp to me. the rated hours are always up to the published hours and never "this is what you will achieve." I would suggest getting a lamp as you will need one shortly by the sounds of it. In many cases the projector does this as it is programmed to protect itself from the lamp shattering inside the projector. Let me know if you would like a quotation for a lamp as we ship internationally. Regards Kevin Andreassend. +64-9-4142348

Mar 28, 2009 | Optoma H31 HOME THEATER PROJECTOR...

2 Answers

Projector turns on but no light or image from lens.

The bulbs do not always look broken when dead. You say it is used often. The life of a bulb is around 1400 hours I believe. This normally equates to a year or two depending on your usage levels. Did you notice your image getting dimmer in the months before it stopped working? This would be a good sign it was in need of replacement. Are the lights flashing very rapidly or blinking slowly? If they are flashing very rapidly this indicated the bulb will not fire and needs replacing.

Jan 16, 2009 | Dwin TransVision 3 Plus Multimedia...

1 Answer

How to check for lamp life of my mitsubishi multimedia Projector xd 450u (DLP)

This should work:

How to reset the operation time meter
Plug in the power cord, switch on the projector, and
reset lamp time by pressing the (left and right arrow) and POWER buttons on the control panel simultaneously.
• If the 3 buttons was not pressed at the same time,
the lamp time may not be reset.
• Please confirm the TEMP indicator illuminates
about 2 seconds and the lamp time has been
• The projector will not turn on if you do not secure
the lamp lid.
• You must reset the operation time meter after you
replace the lamp.
• Do not reset the operation time meter unless the
lamp has been replaced.

Jul 14, 2008 | Office Equipment & Supplies

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