CurtPalme.com Home Theater Forum

ro-man · Joined: 01 Dec 2008 Posts: 3 Location: Texas

My Faithful NEC XG110 has begun to have very strange behavior of late. New Problems include:

1) Ghosting affect - a lite blueish purple halo appears imiidiately to the right of all images.
2) A Horizontal refresh line now moves from image top to bottom, some resolutions have 2 such lines.
3) Certain demanding resolutions (1280/960) cause the bottom converged lines to display erratically, skewed diagonally along the bottom seperated rgb.
4) Certain demanding resolutions (1280/960) cause the projector to "fritz". The image will go out of synch, then re-establish, then eventually, if left to long, the image would fail to resynchronize.

I fear the worst for my projector. My hope is I have some kind of bad board that can be repaired or replaced. Maybe its a control setting i have not discovered. I have been very pleased with my projector over the last 5 years and would hate to hear it is time to "shoot old paint". Please advise with thoughts or suggestions on how to troubleshoot and remedy. Thanks!

Roger

Tom.W · Joined: 09 Mar 2006 Posts: 6635

What is your source and are sure it not source related.

1) sounds like you need to check the convergence to be sure

2) sounds like a ground loop

http://www.epanorama.net/documents/groundloop/index.html

Never owned an NEC XG though or NEC for that matter....

**Curt Palme** · Posted: Mon Aug 17, 2009 11:14 am Post subject:

If the internal menus in 'color' (not green) look fine, then you have an input/cable problem with the halos.

2) Sounds like a ground loop which could be related to the source/cable issue.

3 and 4 could be a bad system board. I can test/repair that for you.

Mark_A_W · Posted: Tue Aug 18, 2009 10:17 am Post subject:

I dunno...there was an Aussie XG with a similar sounding purple halo fault (you sold it to Ray, Curt).

I don't know what the solution was in the end, the projector was sold on.

Elaine Benes · Joined: 25 Apr 2006 Posts: 1416

[quote="Curt Palme"

3 and 4 could be a bad system board. I can test/repair that for you.[/quote]

Curt, do you think this is the beginning of the "dreaded scrambled mess" ? It sounds like it to me, from projectors I've had, I didn't know there WAS a fix for this ?

Have you implemented a fix for the "dreaded scrambled mess" or do you think this is a different problem ?

jarseneau · Joined: 06 Nov 2007 Posts: 323 Location: WI

1) The Drive value is set too high under KELVIN settings for Blue/RED. This will make bright objects smear that color to the right. Back them off to 60 or less. You might need to compensate GREEN. KELVIN or Greyscale setup is tricky so record your initial values before changing.
3) I've seen the diagonal lines at the bottom if the shift is set too negative. Try raising it closer to 0 and see if the lines go away.

ro-man · Joined: 01 Dec 2008 Posts: 3 Location: Texas

Thanks greatly for the prompt replies. Some results.

Problem 3 and 4 are not related to the source, its a projector issue. Curt, what board do I need to send you to have this repaired? What is the rate... how to proceed?

Regards problem 2, there was good news. Its not the projector or the cable. My laptop did not have the crawling refresh line. My HTPC running a humble Radeon 9700 for the last few years has the problem. Going to play around with the power feeds and swap out Video cards and see if I get an improvement.

I appreciate the advise on the drive value, will play with that too. Seems my old XG is about to get some much needed TLC Smile

. More to follow. And my sincere thanks to you all.

Roger

**Curt Palme** · Posted: Thu Aug 20, 2009 2:43 am Post subject:

There are some fixes now for the system boards, but without seeing pictures from ro-man, it's hard to tell. Ro-man, post some pix of the test patterns, that should narrow it down some.