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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Fri Jul 28, 2006 3:49 pm Post subject: POP! ... and my blue convergence is off... |
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Projector: Zenith 1200 (aka Barco Cine 8 Onix). 1000 hours on the chassis and tubes.
Was watching a movie last night and had a loud pop from the PJ after which the blue static convergence was off by about an inch or two. My guess is that there was a little discharge/short in the blue tube (?).
I re-adjusted and it seems fine and stable again. Turned it off/on and it hasn't moved.
Question: I know that sometimes you can get little pops from time to time as things discharge (especially in the first few hundred hours), but what could cause the convergence to go off and stay changed? Did something physically 'change' in the blue tube that I'm now compensating for with slightly different raster shift (master static convergence)?
Should I open her up and reseat all HV leads or something else?
Kal
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My basement/HT/bar/brewery build 2.0
Last edited by kal on Fri Jul 28, 2006 4:29 pm; edited 1 time in total
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DonKellogg
Joined: 31 May 2006
Posts: 180
Location: Kalamazoo, Mi
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| Posted: Fri Jul 28, 2006 3:51 pm Post subject: |
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Hmm if only you knew someone that makes a living repairing CRT's..... j/k
Reseating never hurts, well not if you don't shock yourself 
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Fri Jul 28, 2006 4:56 pm Post subject: |
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What lenses does it have?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jul 28, 2006 5:22 pm Post subject: |
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Yeah, I've never heard of that problem before. good luck!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Jul 28, 2006 5:23 pm Post subject: |
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Heehee, kidding!
It's possible that the blue memory glitched. If it's fine now, and you're not maxed out on the raster shift, don't worry about it.
Keeping my eyes out on more of those sets, no luck so far.
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Fri Jul 28, 2006 5:24 pm Post subject: |
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Curt-
You should have done a clarence - lock the thread after your first comment.
Kal - when is the second due (not PJ) ?
_________________
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Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Fri Jul 28, 2006 6:08 pm Post subject: |
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| kal wrote: |
The short throw of these lenses really works out in my room with 2 rows of seats, so I want to keep this unit for a while...
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Man am I in touch with this! This machine is the ultimate for if you have 2 rows. You can't really do 2 rows well with many other machines. I love it.
Dave
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Fri Jul 28, 2006 6:32 pm Post subject: |
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| Curt Palme wrote: | | Yeah, I've never heard of that problem before. good luck! |
That's it... I'm banning you from your own forum.
| Curt Palme wrote: | Heehee, kidding!
It's possible that the blue memory glitched. If it's fine now, and you're not maxed out on the raster shift, don't worry about it. |
Hmm. Nothing maxed out... everything's at 50/50. I'll just re-adjust electronically. I noticed that red is actually slightly off too.
What I don't understand is that it's affecting all memories... 720p, 1080i, a few other odd-ball resolutions I use. They all have the exact same offset with blue off shifted up and right, and red slightly down.
Zone convergence wasn't affected at all... after I shifted the red and blue rasters back to line up with green, no zone touchups were required.
I'd suspect the H-shift board, but the vertical displacement was off too... strange.
Curt: Think it's worth opening it up and reseating everything even if it's been running just fine for a few hours since the 'pop' ?
Kal
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My basement/HT/bar/brewery build 2.0
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Mad Mr H
Joined: 07 Mar 2006
Posts: 641
Location: London , England
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| Posted: Fri Jul 28, 2006 7:20 pm Post subject: |
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KAL,
Curt knows best, BUT could I just add one possible option......
Check the scan coil board, LOOK VERY carfully at the Large "protection" resistors in the middle of the board, one per colour (color!)
IF for any reason it has "popped" , and it is DESIGNED to do so then what you mention might be possible, I had this happen ONCE.
Took me a week or more to work it out, it all looked fine.
Now if this has happened then why ? I dont/wont know but Curt might help you out if you ask nice..................
Worth a look, and YES I would open up to check all OK.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Fri Jul 28, 2006 10:05 pm Post subject: |
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[quote="kal"] | Curt Palme wrote: | | Yeah, I've never heard of that problem before. good luck! |
That's it... I'm banning you from your own forum.
LOL!!! I'd donate $20 with paypal JUST to see that! It's got to be a week, though. 
Marc
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Z-Photo
Joined: 07 Mar 2006
Posts: 2749
Location: Huntsville - Alabama
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| Posted: Fri Jul 28, 2006 10:30 pm Post subject: |
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It's a Tumor
_________________
Engineer by Day
Photographer by Night
My Portfolio
The Only GOOD AMPRO - is a Dead AMPRO.
wait - are they not all DEAD already?
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Mad Mr H
Joined: 07 Mar 2006
Posts: 641
Location: London , England
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| Posted: Fri Jul 28, 2006 10:51 pm Post subject: |
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KAl,
I forgot that unit is 808 based.........
the scan board in 120x series is much different.
MAYBE check the board it links too.....
Those resistors shown are NOT protection versions......
(Maybe better to ignore me !!!!)
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Tinman
Joined: 09 Mar 2006
Posts: 1326
Location: Carson City Nevada
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| Posted: Sat Jul 29, 2006 12:53 am Post subject: |
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Yeah, and if you DID ban Curt for a week, we'd all laugh about it on AVS. Next best thing to a dunk tank.
Marc
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nick2004
Joined: 05 Apr 2006
Posts: 10
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| Posted: Mon Jul 31, 2006 3:53 pm Post subject: |
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My PJ did the pop thing once about a year or so ago - the red jumped over (left I think) by about 1 inch. All memories had to be raster shifted to compensate, literally the PJ went pop and the image disappeared briefly. Touch wood it has never happened again. The tubes had a max of 500h and the current theory was that it could have been a particle of phosphor interfering with the HV circuit and the controller.
This happened on a BD808s with LC tubes.
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kal
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Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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nick2004
Joined: 05 Apr 2006
Posts: 10
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| Posted: Tue Aug 01, 2006 11:22 am Post subject: |
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Now I think back it was more of a tick than a pop, nevermind. These are great units, mine is currently running something like 1440x1152@50Hz for PAL with a razor sharp picture (VS the Data 808s I had before w/o LC)
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