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attah
Joined: 18 Apr 2010
Posts: 4
Location: Sweden
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| Posted: Sun Apr 18, 2010 1:10 pm Post subject: Barco 801s reseting convergence temporarily |
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First post, so I'll try my best not to act too much like the newbie I am.
So i have had this Barco 801s for about a year now, and it has started messing up the image for a few seconds at seemingly random intervals. The different colors does simply not converge then. Red and blue moves somewhat to einther side and upwards. R, B are also a bit skewed when that happens. 2-5 seconds later it's back to normal.
There is a slight convergence difference when the proj. is cold, which i have blamed expanding metal monts for, but it could posibly be related. Anyhow that is gone after a few minutes of warm-up.
I also have a slight glow of a red led in the "Horizontal output board" http://www.curtpalme.com/Barco500_Layout3.shtm
Its the one (the only one on the board?) in the top-middle of the picture, just under the metal plate, and above the IC.
I haven't been able to find anything in the manuals about what that led indicates, does anybody know?
Hope this description is something to go by, I'll try to be as fast as possible answering any questions since i'm afraid that i'm abusing my beloved video-monster.
Thanks
/Anton
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sun Apr 18, 2010 8:21 pm Post subject: |
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That glowing led is normal, both my 801s do that.
Sometimes memory blocks can mess up and cause what you describe. Chances are higher if there is lot of blocks in memory.
Delete all blocks from service menu. Then set convergence off and set to mid position. Adjust your source again and see if that helps.
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attah
Joined: 18 Apr 2010
Posts: 4
Location: Sweden
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| Posted: Sun May 30, 2010 8:07 pm Post subject: |
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Sorry, I forgot to say thanks. 
Unfortunately it didn't help, and I have had increased problems with convergence on the vertical axis.
(Doesn't converge until it's warm)
I'm in the middle of exams right now, but I'll reset again and loosen/re-adjust the lenses too, asap after tomorrow.
Any other suggestions would be great, such as aging capacitors I should look extra carefully at.
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till
Joined: 25 Jan 2010
Posts: 31
Location: Germany
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| Posted: Sun May 30, 2010 9:35 pm Post subject: |
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I have such convergence shifts as well with my barco data 801s, but they are not very often and last far less than a second.
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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: Sun May 30, 2010 9:37 pm Post subject: |
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Sounds to me like your convergence board is going bad. Common at this point due to age, but mainly due to the old style convergence boards being so large, and flexing over time.
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attah
Joined: 18 Apr 2010
Posts: 4
Location: Sweden
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| Posted: Tue Jun 01, 2010 12:44 pm Post subject: |
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Okay, thanks.
That would mean there is no use resetting again, or?
I wanted to take a look at the convergence board, but im too stupid to get there.
The large screws as per http://www.curtpalme.com/Barco500_Layout1.shtm
are not anywhere to be found.
It seems to me that all the smaller screws are holding the plate to the board.
Repairs are possible, right?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Tue Jun 01, 2010 2:12 pm Post subject: |
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| attah wrote: | Okay, thanks.
That would mean there is no use resetting again, or?
I wanted to take a look at the convergence board, but im too stupid to get there.
The large screws as per http://www.curtpalme.com/Barco500_Layout1.shtm
are not anywhere to be found.
It seems to me that all the smaller screws are holding the plate to the board.
Repairs are possible, right? |
My BD801s have similar two bigger securing screws that in B800 picture
maybe those are missing?
801s have also extra heatsink between tubes inside chassis for convercence board, there is thumpscrew between tubes near HV-splitter that need to be loosened before convercence tray can be pulled out.
500/800/801 don't have this heatsink and thumpscrews.
If your whole raster position is slowly drifting vertically, then it's not convercence board problem since raster vertical movement is done in vertical deflection board and horizontal in Hsift board. Adjusting R/B convercence center zones to 50/50 and making raster centerings from boards pots could also help to whole raster drifting.
More than 1-2 mm movement after 30 minutes warmup time is not normal. Could be mechanical problem, loose tube or lens screw. Electrical, old caps in smps or vdef board or something else.
If it's fast movement, then it's something else.
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attah
Joined: 18 Apr 2010
Posts: 4
Location: Sweden
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| Posted: Tue Jun 01, 2010 2:40 pm Post subject: |
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Okay.
The shifting is slow, 1 hr or so.
The bigger screws simply aren't there, neither are any holes or such.
Maybe, there is nothing holding the tray up front then. How much loosening are we talking about, completely?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Jun 01, 2010 10:22 pm Post subject: |
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| attah wrote: | Okay.
The shifting is slow, 1 hr or so.
The bigger screws simply aren't there, neither are any holes or such.
Maybe, there is nothing holding the tray up front then. How much loosening are we talking about, completely? |
There maybe no large screws at all and the tray is simply pushed into place this was the case with the latter convergence tray design that has two smaller boards rather than one large board. You will need to get something behind the metal plate on the front of the convergence tray and just gently prise it forward. There should be four (4) screws at the front of the convergence tray two (2) on each side, these do not hold the tray in place but if they are there then this confirms this course of action.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Jun 02, 2010 11:37 am Post subject: |
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| attah wrote: | The shifting is slow, 1 hr or so.
Maybe, there is nothing holding the tray up front then. How much loosening are we talking about, completely? |
If it's whole raster drifting slowly, then it's probably not convergence problem.
But if you like to test it, check if there is those thumpscrews inside frame before ripping tray out. Screws need to be turned completely open. Screws comes loose but don't still come out, there is locking rings behind cooling block.
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