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Author Topic: NEC 2000C pink trouble Jerzy Gwizdz Film Handler Posts: 25 From: Nowy Sacz Malopolska Poland Registered: Apr 2015 posted 02-10-2017 03:52 AM                        Hello What can cause this problem Pink stain on the screen Photos Thank you in advance for your help  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-10-2017 08:51 AM                     Jerzy - your problem is, you are mistaking a NEC 2000C for a Sony, because, as per forum policy, this can only happen to Sonys, but never to DLPs. So, please have another look at this projector's number-plate and confirm your error. Regards - Carsten  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-10-2017 09:04 AM                     Carsten: LOL! I believe Mark posted a similar issue with a small 900?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-10-2017 09:48 AM                     Check the prism for some goop of some sort. On the NC-900 a bug had gotten stuck to the rear side of the face of the light inlet prism. That bug eventually disintegrated and the problem at that site is now barely visible. If you run a popcorn popper, then this one may have pulled in come oil that is contaminating the prism. Wrong offers a cleaning service for NEC prisms at the ludicrous price of about $2500+. Your tech may also be able to clean it depending on how resourceful he/she is and if the contaminated surface is actually accessible or not. Could also be something on the lens. Best way to tell is to turn on the DMD's one color at a time to isolate which DMD is causing that. Then it will be very obvious. Except for having to be extremely careful with the giant 6000 pin plug, the NEC light engines are probably the easiest of all to pull for inspection. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-10-2017 10:35 AM                     good idea to check colour by colour. Easiest? Have you ever removed an engine on a 515? (Carsten, I'll need your help very soon! )  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 02-10-2017 12:18 PM                     With any projector it's massively easier than on an 1100L.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-10-2017 02:03 PM                     Add the NC-900 to the NC-1100 list! They really bury those down inside, like 5 sub chassis down! NC-1200, 2000, 3200 and 3240 are all very easy to pull the engine. Literally a ten minute job. Even a 1978 Chevy Malibu engine is easier to pull than an NC-900 or 1000 engine is. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 02-10-2017 08:16 PM                     Magenta means that green is blocked...look to that imager to have dirt in its path.  |  IP: Logged Jerzy Gwizdz Film Handler Posts: 25 From: Nowy Sacz Malopolska Poland Registered: Apr 2015 posted 02-11-2017 04:22 AM                        Carsten- this is NEC 2000C worked 30,000 hours My local service can not clean the prism can remove and send it to the manufacturer It's a very big cost for now it is not visible to watchers question - will it increase? Regards  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-11-2017 10:22 AM                     Yes, it probably will get worse. It's caused by the fan above the light engine blowing crud that makes it past the filter into the engine prisms. NEC SHOULD HAVE put a filter on that internal fan!! I suggest you call another more experienced Tech and consult with him or her about cleaning it on site. Also, if you have popcorn popper (or similar)that is not exhausted outdoors then that is the likely culprit. I have seen popcorn oil dripping off components inside of Christie projectors. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-11-2017 10:50 AM                     as mentioned before, filtration on NEC machines is mediocre at best. Christie have a much better system. Barco don't care as their engines are (supposed to be) sealed. The DMD's, Mark, not the engine itself. I heard mixed info on NEC's: are those engines supposed to be sealed or not? My limited experience says they aren't.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 02-11-2017 03:44 PM                     Depends on who's filters you use. If you are using the cheap chinese filters you get cheap results. Some of my customers that use them add foam tape to the edges of filter to seal it to the projector better and between filters. This helps immensley. The NEC true Heppa filters work really well, but are almost 30 USD a pop. I have NEC's in many desert areas and the lack of dust in them is amazing to say the least. Most still look brand new inside, absolutely no dust. Dust buildup is any electronic components enemy and will shorten it's life. Its the main reason I do not like Barco. They can seal the light engine up all the want to. But I've seen up to a 1/8" thick coating on talcum like dust circuit boards in Barco's with metal filters that came out of CA. The dust also shortens fan life. Yes, the newer ones are better having done away with that useless metal grate filter. On Christies the Electronics compartment stays clean. But the lamphouse is another story. I've had popcorn oil dripping off Christie lamp supports on more than one occasion. Thats a horrible mess to have to clean up. Mark  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 02-11-2017 04:27 PM                     quote: Mark Gulbrandsen Some of my customers that use them add foam tape to the edges of filter to seal it to the projector better and between filters. This helps immensley. That's tweaking and as such does not qualify. No digital projector is supposed to be used in a place where - with mesh filters in place - a thick coat of dust deposits between service intervals. I do not blame Barco. And I've seen an NEC - with original NEC filters - with a totally contaminated engine. Either you do like Christie and put some efforts in filtering the air entering the engine or you seal the DMDs' area. Sorry but putting the filters on plastic frames, sitting on metal slots with no gaskets is just plain wrong.  |  IP: Logged Jerzy Gwizdz Film Handler Posts: 25 From: Nowy Sacz Malopolska Poland Registered: Apr 2015 posted 02-12-2017 04:04 AM                        Thank you for your help Generally filters change frequently and our NEC is clean but sometimes the filters are not suitable Popcorn is but further away from the projector For now we are waiting for further developments All the best Jerzy  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 02-12-2017 07:04 AM                     After 30.000 hrs, every projector has a right to discolor to a certain extent, no matter wether the filters have always been changed on schedule or not. Sometimes, you may get rid of it by cleaning, sometimes, especially after long operating times under high brightness, you may need to change some optical parts. - Carsten  |  IP: Logged

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