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Nec XG75, Lines "giving up"

 
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karlandreasa



Joined: 03 Mar 2011
Posts: 23
Location: Gråbo (Göteborg) Sweden


PostLink    Posted: Mon Jan 11, 2016 1:35 am    Post subject: Nec XG75, Lines "giving up" Reply with quote


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This is a wierd one.
After approx. 2hours the picture has slowly moved left about a Cm and this happens: https://drive.google.com/file/d/0BxV1FUMq9NdOU0pTVnI5NFQxQ2c/view?usp=docslist_api

Everything goes back to normal when you switch input and then back (or, last time, only by pressing any remote-button so that the overlay starts).

I have a Moome-card and tun a pc with 1080i. Also a ps3 with 1080i (but i'm not shure i've seen it on the ps3)[/url]

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Electrohome 9500LC ULTRA.
NEC XG75.
No place to put them.

Yet.
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23731
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Jan 11, 2016 3:57 am    Post subject: Reply with quote

What I would do is measure exactly where the test grid is, and see if that moves the cm as well. If not, then I would suspect a source/Moome issue and not a projector problem. If the crosshatch moves as well, then the problem is within the projector.
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karlandreasa



Joined: 03 Mar 2011
Posts: 23
Location: Gråbo (Göteborg) Sweden


PostLink    Posted: Mon Jan 11, 2016 11:11 am    Post subject: Reply with quote

I will check! I forgot to say that the coloured lines at the bottom appears suddenly after those 2h and is slowly sinking/bending down
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Electrohome 9500LC ULTRA.
NEC XG75.
No place to put them.

Yet.
Smile
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gjaky



Joined: 05 Jun 2010
Posts: 2650
Location: Budapest, Hungary


PostLink    Posted: Mon Jan 11, 2016 5:00 pm    Post subject: Reply with quote

The coloured lines at the bottom are caused by raster roll over. It seems you don't use any vertical blanking, with that you can hide those lines. Also you can try to set "position" so your picture remain within the raster.
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB
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Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23731
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Jan 11, 2016 5:46 pm    Post subject: Reply with quote

He's right, or you can use raster shift to move the image up/down, and then use the tilt on the mount to compensate to get the image away from that problem. It can still be the signal, but you may have a problem with the H/V shift board in the set. I've got spares if you need one.
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karlandreasa



Joined: 03 Mar 2011
Posts: 23
Location: Gråbo (Göteborg) Sweden


PostLink    Posted: Wed Mar 02, 2016 1:31 pm    Post subject: Reply with quote

Hello again! sorry for the late, late answer and thanks for your help:)
-The crosshatch moves slowly to the left aswell and the lines start sinking (but only if i leave it on for a while since everytime i get the overlay up it resets (both position and sinking lines at the bottom).
-I will try to move the picture inside the raster but it looks like the picture uses every line from the top to bottom. what do i do then? do i have to sacrifice something?
-I have a working spare-projector (bad/missing tubes), if i would swap the H/V shift board, do i have to redo the set-up process to make everything fit? anything i should know?
-I talked to a CRT-friend in sweden that talked about interference from for-example bad/worn-out caps in the Powersupply that messed up something and that the projector went through some sort of re-sync-process every time i push for-example "store". Is that something i should try swapping aswell?

_________________
Electrohome 9500LC ULTRA.
NEC XG75.
No place to put them.

Yet.
Smile
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gjaky



Joined: 05 Jun 2010
Posts: 2650
Location: Budapest, Hungary


PostLink    Posted: Wed Mar 02, 2016 5:31 pm    Post subject: Reply with quote

The projector needs some time to stabilize the adjustment, although, but a few cm seems a bit much.
-Myebe you should reconnect the deflection yoke cables.
-If you want to play with boards I'd suggest the OSC or Wave boards for start.

_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB
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