Hi I've tried replacing the lamp on the NEC NP40 several times and the new lamp does not light up but when I put the old back in, it works still

The NEC MT1060 lamp hours is stored in an EEPROM chip built into the lamp. As soon as you put in a new lamp (MT60LP or MT60LPS), the hours will be reset. If you remove and put back in an old lamp, the unit will see the hours on that lamp. Thus if the lamp has reached 2100 hours, the projector will remain in standby. See page 53 of the manual for the replacement and reset information.

Most of the manuals for the NEC projectors are available here: http://www.nec-display.com/dl/en/pj_manual/lineup.html . The direct link to the manual for the MT1060 is http://www.nec-display.com/dl/en/pj_manual/mt1065.html .

I hope this helps.

Cindy Wells

Ballast is possible if repeated lamp failure but I have a solution I posted several times for this type of problem that works and is simple to try:

http://www.fixya.com/support/t12296849-turns_off_shortly_after_turn?mt_f=viewFull162

Thats a lamp switch error. You need to keep trying to reseat the lamp till it goes away.

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Did you try unplugging the unit from the wall, replugging, then cycling power?

We have the same model here at our school too. I know of two that have done exactly what you said. I am trying to figure out if this is NEC fault. Bulbs are expensive and if the projector and NEC is a fault; we will definitely be moving on to a different brand.

change the lamp even if the old lamp

use original nec remote contro

l6. After you install a new lamp, select the lamp Usage icon and press and hold
the "Power On" button on the remote control for ten seconds to reset the
lamp time clock to zero.
NOTE: If resetting the lamp clock back to zero after 2100 hours of service,
press the "Power Off" (not "Power On") button on the remote control for ten
seconds

indicating ballast unit problem

When the lamp exceeds 2100hoursof service, the projector cannot turn on and the manu is not displayed. Do the following:
For VT670/VT470 Press the help button on the remote control for a minimum of ten seconds.
For VT570/VT47 Press and hold the power and the exit buttons on the remote control simultaneously for a minimum of ten seconds. When the lamp time clock is reset to zero, the lamp indicator goes out. Hope this helps! :]