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Poor sharpness in picture
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stridsvognen
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Posted: Sat Jan 04, 2014 1:13 am    Post subject:

Nashou66 wrote:
The reason might be Kurt because the 9 inch set you have has red and green c elements where the ac is clear. so there might be
a possibility that your sets behave that way due the fact that the red and green are outputting a little less light due to the colored C's.

'On my Ac vs LC the LC was brighter but i had red and green Hd 144's. As for the sharpness the * inch did seam sharper. Why? I have no idea as the HD 10E's are the sharpest of all the HD 10's I have and I have a set of each, well did, I sold the GT 17's.

Nashou


Im sure there is more than 1 reason, but what it is will just be speculations, so ill just stick to what i wrote before.. Sure color corection eat light, maybe the C elements in the LC to. color corected or not.. Maybe the glycol eat some light to, i cant say what do what and how much, maybe the HD10 is not passing as much light as the HD8.

The end result just seems to be that i need less contrast to get the same light, and less contrast on a standard marquee seems to be the same as sharper image.

( not saying i think the AC is sharper, but might explain why the thread starter remember his 8500AC looking sharper.)
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CasetheCorvetteman



Joined: 09 Nov 2008
Posts: 6326
Location: Australia

Posted: Sat Jan 04, 2014 1:31 am    Post subject:

Colour correction eats little to no light, its colour filtering that eats light.
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RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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crt nuts



Joined: 19 Sep 2008
Posts: 58
Location: Wellesley

Posted: Sun Jan 12, 2014 10:58 pm    Post subject:

Hi guys

Been away for a while but see that this has generated some interesting theories. I have not fiddled with scheimfplug but have gone through the astig getting round rings with dots centred and such.

I want my old 8500 back..... new issue developed since I last checked and asked about the sharpness. There are now horizontal lines on the image (all three tubes) like -_ -_
-- -__ if this makes sense. I think someone had this issue back in the days of AVS I just don't remember but guess its in the CLM or not, maybe just needs a good once over with some compressed air or something.

I'm getting dejected and cannot even sit down with a good (or any) movie these days what with all the winter storms preventing outside activity. Oh well ...

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draganm



Joined: 08 Mar 2006
Posts: 8990
Location: Colorado

Posted: Mon Jan 13, 2014 5:33 pm    Post subject:

crt nuts wrote:
I want my old 8500 back..... new issue developed since I last checked and asked about the sharpness. There are now horizontal lines on the image (all three tubes) like -_ -_
-- -__ if this makes sense. I think someone had this issue back in the days of AVS I just don't remember but guess its in the CLM or not, maybe just needs a good once over with some compressed air or something.
I'm getting dejected and cannot even sit down with a good (or any) movie these days what with all the winter storms preventing outside activity. Oh well ...
compressed air won't fix anything. You need to send any suspect modules to someone to test in a working chassis. If your seeing this, it's a control module problem. Usually repairable by re-conditioning the board with fresh parts, or replacing the control module outright.
I know it's frustrating when the machine isn't working properly, but it's totally fixable. It's also really frustrating to spend the money go from an 8 inch to 9 inch and have the picture quality and performance go down, but your not the first person I talked to who wound up in this situation. 2 or 3 people I know personally went from a tightly dialed in 8500 to a flaky 9500 and reported both picture dimming and lose of focus, it really depends on the chassis and what condition the boards are in.
Can't help but wonder if this is really a low hour machine or a machine someone re-set the hour counter on after replacing the tubes?



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crt nuts



Joined: 19 Sep 2008
Posts: 58
Location: Wellesley

Posted: Mon Jan 13, 2014 11:41 pm    Post subject: hours

...
draganm wrote:
compressed air won't fix anything. You need to send any suspect modules to someone to test in a working chassis. If your seeing this, it's a control module problem. Usually repairable by re-conditioning the board with fresh parts, or replacing the control module outright.
I know it's frustrating when the machine isn't working properly, but it's totally fixable. It's also really frustrating to spend the money go from an 8 inch to 9 inch and have the picture quality and performance go down, but your not the first person I talked to who wound up in this situation. 2 or 3 people I know personally went from a tightly dialed in 8500 to a flaky 9500 and reported both picture dimming and lose of focus, it really depends on the chassis and what condition the boards are in.
Can't help but wonder if this is really a low hour machine or a machine someone re-set the hour counter on after replacing the tubes?


Actually I think you are one hundred percent right on that one...I think they must have been reset because its highly unlikely such a modded machine would be sold after 500+ hrs. I will check the menus and see what lies beneath....

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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Tue Jan 14, 2014 3:34 am    Post subject:

pull U7 on the DPB. Actually pull all sockets chips on the CLM and the DPB and clean them and use Caig cleaner and protectant on the chips and associated sockets.


Should fix it.

Athanasios

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crt nuts



Joined: 19 Sep 2008
Posts: 58
Location: Wellesley

Posted: Wed Jan 15, 2014 12:34 am    Post subject:

Nashou66 wrote:
pull U7 on the DPB. Actually pull all sockets chips on the CLM and the DPB and clean them and use Caig cleaner and protectant on the chips and associated sockets.


Should fix it.

Athanasios


Thanks Athanasios I actually used some Contact Ol (electrical contact cleaner last night. Just pulled the two boards off and noticed some oxidation on the pins. Have not powered back up yet because I want to make sure it is dry first. Going to try a bit later (fingers crossed) else I will need to get a new clm.

Mark G

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Nashou66



Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY

Posted: Wed Jan 15, 2014 1:08 am    Post subject:

hope it works but to really get the issue resolved you need an ic chip puller and do every chip on clm.

And Caig is the best for cleaning and I use Stabilant22 for conditioning after.


Athanasios

_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher


"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan

One Smart Dog!!!

Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
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