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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Sat Oct 03, 2009 8:02 pm Post subject: think my barco Graphics 801s is dying...help! |
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Hey guys, hoping you can help... I've had this Barco Graphics 801s for a little over 3 years and it's been a great little PJ until now... about a month ago it started flickering and stuttering, as if losing sync, occaisionally dropping to black for a second, sometimes until I turned it off and back on... then last week it really got bad... it now flashes purple, goes black in the center (I can see scan lines trying to reach into the center), the black center grows and then it all pops purple and goes black...
I searched the forums as usual but couldn't find anything like this... It does it on both inputs 3 and 5. It also doesn't matter what i'm trying to resolve... It happens in both 720p at 25hz, 30hz, 60hz, 72hz, and also in 1080i at 60hz (30 with interlaced)... so I don't think it's a bandwidth issue either....
In association with this flashing and dimming/black hole of purple death, the blue tube had a flare up last week during an 'episode' and it burned a flare up on the rester itself leaving a small dead patch.
My wife's crying for a digital PJ, but I know that this has got to be a simple board swap... help!!!!!
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 04, 2009 12:07 am Post subject: |
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I've read this a few times trying to decipher what your explaining its doing. If I'm decoding correctly it sounds like a high voltage problem, with the green also dropping out occasionally.
Can you post a pic of the blue tube?
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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 Oct 04, 2009 1:52 am Post subject: |
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I'm guessing a bad power supply. THe neck boards (video output boards) were redesigned in the 801 to prevent spot burn, but I've seen them spot burn if the power supply goes bad.
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Sun Oct 04, 2009 2:24 am Post subject: |
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I'm about to test it out, I'll see if I can't get a picture or small video clip... it usually starts happening about 10-15 minutes in.
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Sun Oct 04, 2009 2:04 pm Post subject: |
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OK, so here's a quick QT vid of the barco doing a very tame version of the dip to black... still think it's a power issue? That does seem logical.... is that a simple board swap?
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IMG_1193.zip |
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1.29 MB |
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194 Time(s) |
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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 Oct 04, 2009 4:56 pm Post subject: |
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Bah, my computer can't open that, and 'the quicktime website doesn't have the software to do so'.
Stupid computers. Can you upload to Youtube?
Thanks!
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 04, 2009 10:19 pm Post subject: |
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Interesting. Appears to be loss of brightness on all 3 tubes. Not high voltage loss unless its G2 only. Not thinking pwr supply either unless its something Curts familiar with in that area. Think I'll look at some schematics.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sun Oct 04, 2009 10:22 pm Post subject: |
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Does it do it with an internal test patterns up?
Also have you tried a different source and source cable?
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Mon Oct 05, 2009 12:23 am Post subject: |
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it does it with the test pattern up and I've tried it from a different computer on new vga and dvi cables... all roads lead to rome...
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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: Mon Oct 05, 2009 1:17 am Post subject: |
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I know, I know!
Check your 17 volt supply test point, it's off by quite a bit. Reset it,. and you're fine. THat has nothing to do with the spot burn though.
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Tue Oct 06, 2009 3:16 am Post subject: |
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hthd+ just lit up red and it blew another huge chunk out of the blue.... HUGE this time... while I was trying to adjust the +17v....aw crap...
It appears to be an overcurrent protection on the Horizontal Deflection Module... the service manual says that as a failsafe it will kill all three rasters to TRY and prevent raster damage... but is not always successful in extreme cases I guess...
unfortunately the +17v reads out +17.07... which seems pretty accurate to me!
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peacemakerpro
Joined: 03 Oct 2009
Posts: 7
Location: Austin, TX
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| Posted: Tue Oct 06, 2009 3:23 am Post subject: |
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I got the p100 dialed in to +17.00 exactly now... I wonder if there's an overcurrent to the blue raster and it's tripping all of them up in the fail safe... that might explain why there is only a flare up on the blue... which is wasted now...
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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: Tue Oct 06, 2009 2:12 pm Post subject: |
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OK, STOP RUNNING THE SET!
Your SMPS is bad, and possibly your blue neck board as well. If you can source a decent blue tube, then it's worth repairing. If not, then I'd scrap it.
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