Film-Tech Cinema Systems
Film-Tech Forum


Post New Topic  Post A Reply
my profile | my password | register | search | faq & rules | forum home
  next oldest topic   next newest topic
» Film-Tech Forum   » Operations   » Digital Cinema Forum   » NEC NC2500S image distortion - red blocks / bands across image

   
Author Topic: NEC NC2500S image distortion - red blocks / bands across image
Jason Raftery
Film Handler

Posts: 69
From: San Diego, CA, USA
Registered: May 2011


 - posted 11-12-2013 12:19 AM      Profile for Jason Raftery   Email Jason Raftery   Send New Private Message       Edit/Delete Post 
I'm running into a sporadic problem with a handful of 4 or 5 year old Series 1 NEC NC2500S projectors where a show will start and the image will have a green hue that is overlaid by numerous red blocks and bands.

Here are a couple of examples from two different machines:
 -

 -

And a video clip: http://www.youtube.com/watch?v=MECpF9xX6Zo

The problem appears to happen at random, regardless of aspect ratio, color space, when the machine was last power cycled, time of day, etc. The problem is always resolved by rebooting the projector. Once gone, a given machine can go weeks or months without a re-occurrence. In no case have the projector logs offered any clues as to what is happening here.

The problem has not been observed on machines that originally shipped as model NC2500S-A. Projectors are on the current TI / NEC firmware. The problem does not seem to be related to the interface board as one of the affected machines has had Type 3, 5, and 6 boards put in it and still experienced the same problem. Servers are GDC SX-2001As.

Any idea what the culprit is? Is this a common issue as this model projector ages?

 |  IP: Logged

Marco Giustini
Film God

Posts: 2500
From: Reading, UK
Registered: Nov 2007


 - posted 11-13-2013 03:41 PM      Profile for Marco Giustini   Email Marco Giustini   Send New Private Message       Edit/Delete Post 
When the corruption happens, can you try some test patterns from the projector? If corruption is seen on test patterns, try calibration patterns. That should tell you where the problem lies.

Make sure you're running the latest SW (not too familiar with NEC series 1) and it may be worth reseating everything that can be reseated - but you need to know what you're doing.

 |  IP: Logged

Jason Raftery
Film Handler

Posts: 69
From: San Diego, CA, USA
Registered: May 2011


 - posted 11-14-2013 12:22 PM      Profile for Jason Raftery   Email Jason Raftery   Send New Private Message       Edit/Delete Post 
Some degree of corruption was visible on a solid red pattern on the machine where this happened in front of me. A solid white, solid blue, and cross hatch pattern were fine, however. All our 2500S and 2500S-A machines are on TI 15.1, NEC firmware 2.11 and NEC data version 2.16.

 |  IP: Logged

Marco Giustini
Film God

Posts: 2500
From: Reading, UK
Registered: Nov 2007


 - posted 11-14-2013 04:33 PM      Profile for Marco Giustini   Email Marco Giustini   Send New Private Message       Edit/Delete Post 
You are on the latest software.

If you see corruption on a test pattern, then the problem lies in the projector.

I am not sure where the RED pattern is generated on a series 1, I guess if it was the uncorrected one it was generated on the formatter itself? Maybe someone else could be more precise.

On a series 2 I would recommend reseating the boards and the light engine umbilical cord, and maybe the connectors on the formatters as well. But first we need to assess where the RED test pattern was generated: if it's generated on the formatter I guess you'll need a new light engine - or a new formatter, but I'm not sure NEC is supporting it on the field.

 |  IP: Logged

Gordon McLeod
Film God

Posts: 9390
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 11-15-2013 11:00 AM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
Check the cables to the Light Engine some of those ribbon cables can get poor connection issues and they are very fragile

 |  IP: Logged



All times are Central (GMT -6:00)  
Post New Topic  Post A Reply Close Topic    Move Topic    Delete Topic    next oldest topic   next newest topic
 - Printer-friendly view of this topic
Hop To:



Powered by Infopop Corporation
UBB.classicTM 6.3.1.2

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.

© 1999-2018 Film-Tech Cinema Systems, LLC. All rights reserved.