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NEC 9PG xtra brightness problem

906 Views 41 Replies 8 Participants Last post by roessing, Jan 26, 2004

roessing

Discussion Starter · Jan 24, 2004

I have a NEC 9pg xtra that will not allow me to adjust brightness. Everytime I go into the menu to adjust brightness, the red and blue crt's are greatly reduced and the green overpowers. After this occurs, I have to go back out of the settings and back into the brightness menu and then "normal" the brightness to bring the red and blue crt's back into play. This also happens whenever I check the Kelvin, white balance, or AKB settings. I have returned the PJ to factory settings, but with the same returning problem.

I have a Dishnetwork 811 receiver into a transcoder and into the projector which seems to run really dark. Without being able to turn up the brightness, the picture is too dark for viewing in most scenes. A DVD player going into the same transcoder to the PJ produces a picture that is quite bright compared to satellite.

Any assistance would be greatly appreciated.

Martin

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1 - 20 of 42 Posts

gn2

· #2 · Jan 24, 2004

You need your reference mechanical white balance done by a qualified tech. What you're seeing is the AKB trying to work when someone's messed with the G2 pots. Good luck with it.

(At least thats my guess based on my experience, I'm NOT a tech, just had a few NEC's along the way.)

roessing

Discussion Starter · #3 · Jan 24, 2004

Living out here in Nebraska there aren't a lot of techs (unless it's a problem with the Cornhuskers)!

Is there anyone in the neighborhood or other resources I could try?

Martin

roessing

Discussion Starter · #4 · Jan 24, 2004

I also have the AKB turned off, but the problem still persists. Would this still point toward the G2 pots?

gn2

· #5 · Jan 24, 2004

IMHO yes, but hopefully a tech will respond and confirm or deny my guess.

Mark_A_W

· #6 · Jan 24, 2004

My guess is the same as Paul's - G2 and white balance needs adjustment, but I'm no tech either.

roessing

Discussion Starter · #7 · Jan 24, 2004

Are there any other tests that I could do to verify the G2 and white balance adjustments?

What is involved with doing these adjustments?

Thanks, Martin

Tinman

· #8 · Jan 24, 2004

About 8 hours, 12 cups of coffee and a good oscilloscope......

You will need an NEC tech for this one.

Marc

Tinman

· #9 · Jan 24, 2004

BTW, there are NO G2 pots on the Xtra in the traditional sense. Everything is done using the white balance controls on the back video board. Unfortunately, the adjustments are complicated, require a scope among other things, and should NOT be attempted by a novice, even WITH the service manual.

I think your best bet here is to have a real tech (such as Doug) look at it.

Marc

gn2

· #10 · Jan 24, 2004

This forum needs to identify the location of ALL tech's who are qualified, willing, and CAPABLE of doing this setup for NEC's. We can't all afford to ship our projectors to Doug in CA. How can we locate these tech's ? There must be some somewhere ? We need about six in total to cover NA and then a couple in Australia and a few in Europe(although there seems to be fewer NEC's in Europe for some reason).

roessing

Discussion Starter · #11 · Jan 24, 2004

Sounds like something that I don't want to mess with. Any techs out there in need of a trip to Nebraska?

Or would I be better off looking for another PJ?

Martin

gn2

· #12 · Jan 24, 2004

If you have NO choice whatsoever, you can fudge it enough to use the projector, maybe even get a decent image. Try every option besides fudging it first though, then get a service manual and give it a go yourself. Its better than trashing it altogether.

roessing

Discussion Starter · #13 · Jan 24, 2004

Any leads as to where I can find a service manual? Does the service manual give good explanations and procedures?

gn2

· #14 · Jan 24, 2004

Electronic downloadable pdf copies are available from www.freebrd.com for a very reasonable fee. The procedure is outlined there. An explanation of some of the terms can be found on a fellow enthusiasts site http://www.jrobbo.com/NEC/index.html

You could look at this too http://www.avsforum.com/avs-vb/show...threadid=246947

roessing

Discussion Starter · #15 · Jan 24, 2004

Thanks for the information. In the meantime, if anyone knows of a "local" tech who may be able to assist, please let me know.

Martin

Tinman

· #16 · Jan 25, 2004

Quote:

Originally posted by gn2
This forum needs to identify the location of ALL tech's who are qualified, willing, and CAPABLE of doing this setup for NEC's. We can't all afford to ship our projectors to Doug in CA. How can we locate these tech's ? There must be some somewhere ? We need about six in total to cover NA and then a couple in Australia and a few in Europe(although there seems to be fewer NEC's in Europe for some reason).

Great..... now we all have to run around with a GPS locator so the forum members can find us.

Who wants to be first?

Oh, you said WILLING..... that leaves ME out! WHEW!

Marc

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Doug Baisey

· #17 · Jan 25, 2004

Martin,

Open the lid and look for the test normal switch at the very right end of the video out board (the one with the pots) set this to normal and the brightness should work. Test is to the left and normal is to the right standing at the rear looking forward if floor mounted.

If its in the test mode it wont, check AKB from the info screen ( hit the info button) and shut akb off. Doug

Tinman

· #18 · Jan 25, 2004

Hey Doug. You don't suppose......

I didn't want to go there, actually. Though the test switch should not make ONE gun go crazy like this.

Martin,

Doug is correct, of course. But be careful, will ya? It's a TINY white switch.

Try it and let us know what happens. It nonetheless sounds like someone screwed with the pots, and that's a bad thing.

Marc

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Doug Baisey

· #19 · Jan 25, 2004

Marc,

Yes your right, I missed the first post with the explaination.

Martin,

You might try to select the signal you are running, turn AKB on then store, shut back off and store.

Sounds like its the reference white balance.

Write the settings down you have now then go to kelvin, lower the bottom value (B) until its corrected.

If that doesnt work try the top (W) value.

If the kelvin hasnt been stored it could do this for that input or if your running sync on green without knowing.

The info screen will tell you sync configuration.

Kind of hard not seeing it to give a good evaluation but some things to check.

If the test position gives you a good balance then its in the RGB kelvin settings or source. Doug

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roessing

Discussion Starter · #20 · Jan 25, 2004

Thanks for the help. Here are the current settings:

Sync detect: auto separate

freq: h-45 khz, v-60hz

sync: h(-), v(-)

color temp: 6500K

AKB: off

Does this shed any light?

I will try some of the recommendations tomorrow, Doug.

Thanks,

Martin

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1 - 20 of 42 Posts

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