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Another dumb question

 
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jeffslife



Joined: 17 Apr 2010
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PostLink    Posted: Thu Dec 02, 2010 12:24 am    Post subject: Another dumb question Reply with quote


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But probably not the last. While I am letting my pj warm up I notice the white is not uniform. There is an area in the bottom left side of the screen that is, for lack of the correct terminology
less than white.

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virusc



Joined: 11 Apr 2007
Posts: 218
Location: virginia


PostLink    Posted: Thu Dec 02, 2010 12:41 am    Post subject: Reply with quote

this could be many things.

convergence off
white field uniformity issues
wear(burn)
raster not centered and in far edge of lense


Picture would be helpful
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Nashou66



Joined: 12 Jan 2007
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PostLink    Posted: Thu Dec 02, 2010 12:43 am    Post subject: Reply with quote

I love our dumb questions. What color does it shift towards, more pink,green, yellow etc?

Athanasios

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jeffslife



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PostLink    Posted: Thu Dec 02, 2010 2:40 am    Post subject: Reply with quote

very light yellowish brown
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Nashou66



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PostLink    Posted: Thu Dec 02, 2010 2:49 am    Post subject: Reply with quote

It means its lacking Blue. does it eventually become more white?

Athanasios

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jeffslife



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PostLink    Posted: Thu Dec 02, 2010 2:51 am    Post subject: Reply with quote

No, not really,it does become less brown though.
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Elaine Benes



Joined: 25 Apr 2006
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PostLink    Posted: Fri Dec 03, 2010 3:33 am    Post subject: Reply with quote

Its a burned spot on the blue tube, likely a logo of some kind
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ecrabb
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Joined: 13 Mar 2006
Posts: 15909
Location: Utah

TV/Projector: JVC RS40, Epson 5010


PostLink    Posted: Fri Dec 03, 2010 4:06 am    Post subject: Reply with quote

If it's not a vaguely recognizable shape of some kind, but more of a big blob in like a quarter of the screen, then it's probably not burn/wear, but just uniformity (lack thereof, actually).

My G70 has some slight uniformity issues on a full-white screen that I can't seem to dial out. I've never worried about it though because I only see it if I look at a perfectly all-white test pattern.

If it's not too bad, just turn off the warmup screen and you'll never see it. If it is bad, then you can dink around with the uniformity controls in the service menu and see if you can dial some of it out. Maybe you'll have better luck than I did.

SC
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jarseneau



Joined: 06 Nov 2007
Posts: 321
Location: WI


PostLink    Posted: Fri Dec 03, 2010 3:22 pm    Post subject: Reply with quote

My guess is that your BLUE focus or astig is not the same in that corner vs the rest of the screen because the blue needs to be de-focused uniformly to provide uniform brightness. One way to check is to put up a focus pattern with only blue on and check the different areas with de-focus ON and OFF and see if you notice a large change in that area compared to the rest of the screen.
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roland@b4



Joined: 07 Jul 2009
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PostLink    Posted: Fri Dec 03, 2010 5:58 pm    Post subject: Reply with quote

I would cover the red and green lenses and just check that it is not the very edge of the blue image. If you have lots of blue image on the other side of the warm up screen. this could be an indication that the blue is not physically centred on the screen.
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AFryia



Joined: 09 Mar 2006
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Location: S.E. Michigan VPH-G70Q


PostLink    Posted: Fri Dec 03, 2010 9:50 pm    Post subject: Re: Another dumb question Reply with quote

jeffslife wrote:
But probably not the last. While I am letting my pj warm up I notice the white is not uniform. There is an area in the bottom left side of the screen that is, for lack of the correct terminology
less than white.

How does the picture/video look?

That's all that matters.

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jeffslife



Joined: 17 Apr 2010
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PostLink    Posted: Sat Dec 04, 2010 2:50 am    Post subject: Reply with quote

picture looks good ( to me)
its only 1080i
not 1080p like SC but very watchable

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