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

Posted by aussie willo on


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'Leslie Carroll

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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

Turning on

If the lamp cover is loose then it work start.
If no lights come on then the fuses have broken or the power supply.

Jul 26, 2011 | NEC MultiSync MT840 Multimedia Projector

1 Answer

I just bought a used NEC Multisync MT 840 projector with just over 600 hours on the lamp counter. I live in Japan. After about 4 or five minutes of working, the projector turns itself off and won't...

Possible problem is the faulty lamp cooling fan. Check the lamp cooling fan of your projector. if the RPM of fan is low then the lamp can get over heated. May be its has some problem.Do one thing, Remove the fan from the projector. In the fan there will be a specification sticker. Remove the sicker. now u can see a hole in the center. its the bearing part of the fan. put one drop of oil in it. u can use any type of lubricating oil. rotate the fan leafs with finger for some time. after that re-stick the spec sticker. insert the fan in the projector.

i have added a video how to oil the fan for make it easy for you.


May 08, 2011 | NEC MultiSync MT840 Multimedia Projector

1 Answer

There are blueish-purple crystal-like distortions in the projected image. They actually can be brought into focus to look at, and at that point the projected image is extremely out of focus. So, obviously,...

either there is something on the inside of the lens, or there is something on the lcd prism face. if it was the lcd panel, it would be in focus with the picture. take it in for a good cleaning.

Aug 14, 2009 | NEC MultiSync MT840 Multimedia Projector

2 Answers

Status Light Flashes

Hi kmarie01

This is most probably a faulty Ballast ( lamp's powersupply ) that will have to be replaced before the Projector will come on at all.

May 13, 2008 | NEC MultiSync MT840 Multimedia Projector

5 Answers

Double image

Use this link to get company support:

Apr 13, 2008 | NEC MultiSync MT840 Multimedia Projector

1 Answer

Why is my projector only staying on for 5 secs

Lamp is probably bad. You can remove it and while your doing that clean the filter to prolong the life of the new lamp. If you need assistance you can contact someone locally or i may be able to assist you if you want to ship it. Look in you owners manual for lamp # and start surfing for sites that may have it. If that is too much work, contact me and i will assist you. Thank you ... Cheers Jay

Jan 30, 2008 | NEC MultiSync MT1050 Multimedia Projector

1 Answer

Lamp brightness

Most projector lamps last approximately one thousand hours. Other possiblity might be the filter that has darkened due to heat.

Nov 24, 2005 | NEC (SPPL1067) Projector Lamp for MT840,...

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