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Author Topic: NC900 light engine rebuilds
Kyle Mitchell
Film Handler

Posts: 21
From: Streator, Illinois, USA
Registered: Jan 2014


 - posted 01-10-2019 01:37 PM      Profile for Kyle Mitchell   Email Kyle Mitchell   Send New Private Message       Edit/Delete Post 
I have two with many blue pixels. What are the non-warranty options?

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16254
From: Bountiful, Utah
Registered: Jun 99


 - posted 01-11-2019 08:32 AM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
The only option on NC-900 is to send them back to the factory over seas. Its a 6 month wait... I suggest doing it through MIT out in Orange County.

Mark

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12265
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-11-2019 09:13 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
I may be getting fuzzy on this but can't just the Blue Formatter be changed (chip and all)? On the 900, I'm pretty sure that the formatters are a part (each color) and there is no adjustment for them (as-in, they have to build them right, there are no convergence adjustments.)

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Leo Enticknap
Film God

Posts: 7109
From: Loma Linda, CA
Registered: Jul 2000


 - posted 01-11-2019 09:26 AM      Profile for Leo Enticknap   Author's Homepage   Email Leo Enticknap   Send New Private Message       Edit/Delete Post 
There are no Barco and Christie-style physical convergence adjusters, but on some NECs at least there are electronic ones. Never had to do it on a 900, so don't know if there are on that.

Kyle: if you're interested in returning yours for repair through us (MIT in Orange County), please give Jim Stewart a call on 714-751-7998, ext. 228, and he'd be happy to help.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12265
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-11-2019 12:21 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
All DLP series 2s have "electronic" convergence...that is a function of the ICP and it can merely move by 1-pixel increments (handy if you discover the problem going into a screening but don't have time to do a full convergence...which on an NEC is somewhat annoying (NC1200/2000 because they don't leave the screws/adjusters and often things move as you snug up the screws).

The NC900C-A blue formatter assy is 79TY1241. I can't say definitively that the formatter includes the DMD but I'd think it would have to since critical alignment has to happen there in order for the non-adjustable board (and it doesn't adjust) to work. They'd need a precise jig that guarantees all of them are identical. Since they likely cannot control TI's tolerances on the packages, how they mount the DMD would be where slop would be introduced.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16254
From: Bountiful, Utah
Registered: Jun 99


 - posted 01-11-2019 03:47 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
On the larger projectors the DMD and formatter board are separate parts. I have a 900 engine headed my way soon to experiment cleaning...

Mark

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Marco Giustini
Film God

Posts: 2561
From: Reading, UK
Registered: Nov 2007


 - posted 01-12-2019 06:23 AM      Profile for Marco Giustini   Email Marco Giustini   Send New Private Message       Edit/Delete Post 
Have TI fixed that issue where using the electronic convergence adjustment causes an issue with some internal signal processing? (a CSC issue if not mistaken?). At the time TI was recommending NOT to use electronic convergence.

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Leo Enticknap
Film God

Posts: 7109
From: Loma Linda, CA
Registered: Jul 2000


 - posted 01-13-2019 09:23 PM      Profile for Leo Enticknap   Author's Homepage   Email Leo Enticknap   Send New Private Message       Edit/Delete Post 
From the release notes of ICP firmware version 4.5, under the heading "Known issues":
quote: TI Release Notes
There is a known issue using electronic convergence with DMDs that have a DDR interface, (the 1.2DC2K and 1.38DC4K DMDs). When electronic convergence is used to move one or more colors in the horizontal direction, the computation for CSC-P7 color correction is incorrect. This could manifest itself as incorrect color particularly noticeable at the edges of objects in the picture.
I don't know whether this issue is also present in earlier versions, or if it was actually (and presumably unintentionally) introduced into 4.5. It's been over two years since 4.5 was published, so I'm not sure if TI has any plans to release a new version of the ICP firmware that fixes it.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12265
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-13-2019 09:37 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
The problem predates ICP 4.5.

Oddly, Christie starts their electronic convergence at -3 for everything. NEC and Barco start at "0" for everything. Why Christie does this, I have no idea.

I've only used electronic convergence as a quick fix when there is insufficient time to do a mechanical convergence with the indication to the customer that a return call will be needed.

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Kyle Mitchell
Film Handler

Posts: 21
From: Streator, Illinois, USA
Registered: Jan 2014


 - posted 01-14-2019 12:40 AM      Profile for Kyle Mitchell   Email Kyle Mitchell   Send New Private Message       Edit/Delete Post 
The formatter board does not include the DMD and swapping out the board does not change the situation. I tried that months ago when the first one occurred, and now I've got one at another location.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12265
From: Annapolis, MD
Registered: Dec 1999


 - posted 01-14-2019 01:51 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
What you need are the DMDs. If they don't include them, they must have them as parts. I figured that the formatter was the only way to get them since alignment would be critical. NEC is pretty good about providing torque specifications if you end up changing them yourself. Torquing those right is key.

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