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derick
Joined: 10 Jun 2009
Posts: 4
Location: Toronto
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| Posted: Wed Jun 10, 2009 5:57 pm Post subject: Tech: Black band on right side of CRT projector screen |
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Hi,
Firstly I'd like to thank Curt Palme for his wonderful support.
I bought a Barco 808g from him and now even he can't fix it over the phone/email.
It worked fine and now it started to make these flickering black bar's on the right side of the screen.
The bars started small and then grew until they covered the right side of the screen.
I tried adjusting the +17 volt and it seems to have no effect.
The bars are there independent of the input I use.
Ideas?
derick
[img=http://img196.imageshack.us/img196/8075/barco808gblackbandonrig.th.jpg]
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Barco 808g
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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: Wed Jun 10, 2009 6:01 pm Post subject: |
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Hey, just for clarification (and yes, I speed read all emails, then re-read when posted here.)  \
Is that black bar cutting off part of the picture, and where the streaks are, should actually be more of the picture? If that's the case, does the right side blanking work at all? How about the top/bottom and left?
Might be a blanking issue, although I've never seen this before.
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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Wed Jun 10, 2009 8:08 pm Post subject: |
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It looks like the "streaks" have picture content not present in the other visible are. And they do not look like streaks.
The blanking thingey looks like it cuts of part of the picture a little more randomly than it should. Or the switcher switching to a blank osd. Not sure if they are the same.
Broken timer of some sort maybe? Or control circuit.
Unreliable power to controller or switching chip. (bad cap?)
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derick
Joined: 10 Jun 2009
Posts: 4
Location: Toronto
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| Posted: Thu Jun 11, 2009 10:48 am Post subject: |
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| Curt Palme wrote: | Hey, just for clarification (and yes, I speed read all emails, then re-read when posted here.) \
Is that black bar cutting off part of the picture, and where the streaks are, should actually be more of the picture? If that's the case, does the right side blanking work at all? How about the top/bottom and left?
Might be a blanking issue, although I've never seen this before. |
The black bar is cutting off part of the picture on the right side, after a while it gets so that the whole right side of the screen is all black.
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Barco 808g
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jun 11, 2009 12:48 pm Post subject: |
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If it gets worse as the projector runs longer then returns to more picture after being shut down for a while then its a plus for you since it seems to be temp related. Get some cool spray and after most of the pic is gone, spray around to see if it comes back. Because of the fireing lines I would start with the horz deflection board and/or high voltage board.
Also do you see any coolant leaks from the tubes?
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derick
Joined: 10 Jun 2009
Posts: 4
Location: Toronto
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| Posted: Fri Jun 12, 2009 1:17 am Post subject: |
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| Curt Palme wrote: | Hey, just for clarification (and yes, I speed read all emails, then re-read when posted here.) \
Is that black bar cutting off part of the picture, and where the streaks are, should actually be more of the picture? If that's the case, does the right side blanking work at all? How about the top/bottom and left?
Might be a blanking issue, although I've never seen this before. |
The black bar is cutting off part of the picture on the right side, after a while it gets so that the whole right side of the screen is all black.
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Barco 808g
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derick
Joined: 10 Jun 2009
Posts: 4
Location: Toronto
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| Posted: Fri Jun 12, 2009 1:19 am Post subject: |
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| macgyver655 wrote: | If it gets worse as the projector runs longer then returns to more picture after being shut down for a while then its a plus for you since it seems to be temp related. Get some cool spray and after most of the pic is gone, spray around to see if it comes back. Because of the fireing lines I would start with the horz deflection board and/or high voltage board.
Also do you see any coolant leaks from the tubes? |
No coolant leaks from the tubes.
I'll try spraying it ... Can cool spray crack the tubes?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 12, 2009 1:51 am Post subject: |
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I would be careful around the tubes, it may. If you have a compressor you can try just blowing air instead of spray. I've used that method before. You just have to hold it a little longer to an area before moving on. Your looking for a small change to the good first. It may not fully return no matter how much you cool it. Just back to the size it starts out at when first turned on.
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