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Author Topic: Nec Nc2000 c blue dots Erhan Korkut Film Handler Posts: 1 From: Edirne / Türkiye Registered: Feb 2019 posted 03-08-2019 10:53 AM                     hi Nec nc2000c has blue dots in the image of my machine. The number of curtains and time is increasing.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 03-08-2019 01:25 PM                     This is the light engine with stuck-on DMD blue pixels. Not common but it happens. Try loading the alternating checkerboard pattern - I think this is a TI pattern on all series 2 TI based projectors, it has a full white and full black checkerboard that inverts every second or so - and leave it "playing" all night, the lamp does not need to be on. If it's still got blue dots, you can either live with them (and they are likely to get worse over time) or have the prism replaced or repaired. NEC is pretty nice about providing a prism for while the repairs are done (weeks) ... for chains with hundreds of NEC projectors. Not so generous for small cinemas. Might be worth asking though. Curtains and time? Huh?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-08-2019 04:14 PM                     I had this happe on very early 4K light engines and on one NC-2000 light engine where sme demolition work went on literally right next to the peojector. Had to replace all these engines. The 4K engines were still under warranty when they failed and have not failed since. Mark  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 03-08-2019 04:33 PM                     quote: Dave Macaulay If it's still got blue dots, you can either live with them (and they are likely to get worse over time) or have the prism replaced or repaired. I guess you mean the DMD . Although, a new light engine usually is a better option than having yours refurbished. Refurbishment can take forever and in the end you might not get your own light engine back, but an entirely other one. What I've seen is that some DMDs seem to have some kind of "pixel rot", once one starts to fail, others are prone to fail too. Maybe that's because one failed because of a bit of debris got stuck in there. If that one gets dislodged, it can start to affect other pixels.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-09-2019 07:50 AM                     Actually in the case of NC-2000 it is way, way less expensive to repair it via Strong than it is to buy a new one. A new NC-2000 light engine is ~25K USD, while repairing it is in the USD 4 to 6k dollar range if it's only one DMD and cleaning that needed. I was lucky in that I was able to secure a brand new light engine a couple years back from MIT that was out of a shipping damaged projector for 15K. The engine it was replacing had bad pixels on all theree DMD's from demolition done right next to the machine. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 03-09-2019 08:38 AM                     These companies really need a good RX program for light engines. It is BS that they don't have them on the shelf ready for the next failure and then merely repair the one that comes back. What is going to go wrong with them? The DMD or a formatter. Figure out what that costs and the clean/realignment and come up with a fair repair price for the RX. We used to do it for intermittents in the film days.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-09-2019 12:16 PM                     quote: Steve Guttag It is BS that they don't have them on the shelf ready for the next failure and then merely repair the one that comes back. Well, Strong normally does have one they can send out.... if you happen own an NEC. NC-900 excluded.... but the prism can be repaired. Sony's imagers are field replacable. Christie was pretty good at getting one out to me in a few days time. It seems from what I have read on this site that Barco can only be sent in for repair and some have to go back to Belgium. Mark  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 03-09-2019 04:01 PM                     I have not been able to find the alternating checkerboard on the NECs. Also it seems to be something internal on the Barco's and not a png file one can transfer.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 03-10-2019 03:58 PM                     You can actually upload Barco PNG files using the TI control software into the NEC. I have some Barco PNG's on some of the NEC's I installed. Mark  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 03-10-2019 06:10 PM                     quote: Stephan Shelley I have not been able to find the alternating checkerboard on the NECs > There is a flashing-checkerboard on You-Tube that I used once in a pinch. (and it worked! ) It only runs about a minute, so I just downloaded it & had it repeat overnight. Flashing Checkerboard  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 03-10-2019 08:38 PM                     quote: and it worked! [thumbsup] Can you tell us more? So far I thought the checkerboard-repair-method was an urban legend? I never talked to someone first hand who said it worked for him. Some people seem to think that the alternating checkerboard applies special stress - but I think that's nonsense, the micro mirrors are all working the same way with any type of content. - Carsten  |  IP: Logged Jarod Reddig Jedi Master Film Handler Posts: 513 From: Hays, Ks Registered: Jun 2011 posted 03-10-2019 09:48 PM                     This used to be the method for fixing screen retention on plasma displays. Or a scrolling bar.  |  IP: Logged Jim Cassedy Phenomenal Film Handler Posts: 1661 From: San Francisco, CA Registered: Dec 2006 posted 03-11-2019 09:17 AM                     quote: Carsten Kurz Can you tell us more? This was a small, neighborhood theater that sometimes calls me when they have a problem. They reported a "blue spot" in the upper left quadrant of the screen. At the time, I was getting ready to leave town for another job, so I didn't have a lot of time to deal with it. I went down to the theater & I did see what appeared to be a 'stuck' blue pixel on the screen. It wasn't 'horrible', but it was definitely there & once you saw it, it was hard to ignore. As the theater was short on money, and I was short on time & didn't want to spend all night at the theater, ( I had a 3am airport shuttle pick-up the following day) I decided to do the checkerboard thing as sort of a 'Hail Mary' fix for them. Not finding an alternating checkerboard pattern on their projectorthingy (an NEC) I created one for them & told the to let it run until they opened the next day. (so it ran about 14 hrs) I got a text message the next day that the 'blue pixel' was gone. This was about two years ago, and it's never come back. I agree with you that it shouldn't make a difference, & I wouldn't be surprised if this doesn't work all the time, but all I can say is that on this occasion, it "fixed" their problem. The theater was operating on a very tight budget, so if this hadn't worked, they probably would have just left the pixel on screen. In fact, I never even billed them for my last minute late night 'emergency' call, so as far as I'm concerned, they got they're moneys-worth. (Although I recently did another emergency job for them which saved them from loosing a sold-out show, for which they paid me almost double what I billed them, so "it's all good".)  |  IP: Logged Marcel Birgelen Film God Posts: 3357 From: Maastricht, Limburg, Netherlands Registered: Feb 2012 posted 03-12-2019 02:36 PM                     Well, maybe it was just showing 14 hours of "moving images" that did the trick eventually.  |  IP: Logged Stephan Shelley Jedi Master Film Handler Posts: 854 From: castro valley, CA, usa Registered: Nov 2014 posted 03-13-2019 06:22 PM                     Yes mark I know one can install Barco test patterns in an NEC. I have done it as well. The issue is that NEC does not seem to have the alternating checkerboard and on the Barcos I have checked it is not a PNG file but seems to be internal and not something one can download.  |  IP: Logged

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