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winny
Joined: 09 Oct 2013 Posts: 403 Location: Sweden
TV/Projector: BD808s, BG1209/2
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Link Posted: Tue Jun 30, 2015 10:41 am Post subject: BG1209/2, flickering brightness at startup and H size drift |
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New problem since last week, there is a flicker in brightness when I turn on the projector from cold. Both input signal and generated menues are affected. I will try to capture a video of it. I would say all three tubes but I'll get back in that regard.
At the same time, H size has started to drift quite a lot. Normal geometry and convergence drifts perhaps a few percent from cold to hot but H size I need to adjust from 71 down to 52 to keep the width. This wasn't the case a few weeks after I replaced the H board.
Once the projector is hot there are no problems.
The problems came at the same time. Same or two different problems? Suggestions?
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Melifluonze wrote: | Digital is easy. This is torture, but far more interesting... |
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barclay66
Joined: 27 Jun 2011 Posts: 1291 Location: Germany
TV/Projector: Marquee 9500 Ultra
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Link Posted: Tue Jun 30, 2015 12:04 pm Post subject: |
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Hi,
After warmup (when the problems have ceased), You could try freeze spray (I use Freeze 75 from this brand: http://www.kontaktchemie.com/KOC/KOCdefault.csp). Spraying onto hotter parts in the SMPS, the H board and maybe the Video switcher/driver boards could reveal the location of the problem...
Regards,
barclay66
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24296 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Tue Jun 30, 2015 2:08 pm Post subject: |
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It can really only be the SMPS or H output board. I've never seen H size drift before though, so I can't narrow it down any more than that.
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CasetheCorvetteman
Joined: 09 Nov 2008 Posts: 6319 Location: Australia
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Link Posted: Wed Jul 01, 2015 5:10 am Post subject: |
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Examine the boards close up, check the solder joints
_________________ Barco CineMAX, 120" OZ Theatre Majestic 16:9 screen, H/K AVR 7.1...
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winny
Joined: 09 Oct 2013 Posts: 403 Location: Sweden
TV/Projector: BD808s, BG1209/2
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Link Posted: Wed Jul 01, 2015 12:02 pm Post subject: |
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Thanks! I'll get some freeze spray and test the H board and SMPS.
Here is a video:
https://www.youtube.com/watch?v=IqOjpuOz70A
It flickered less than usual but you can still see the problem.
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Melifluonze wrote: | Digital is easy. This is torture, but far more interesting... |
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24296 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Wed Jul 01, 2015 4:51 pm Post subject: |
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It might be the HV splitter. Taking a guess here though.
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gregstv
Joined: 27 Aug 2007 Posts: 628 Location: Australia
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Link Posted: Wed Jul 01, 2015 8:36 pm Post subject: |
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I would not freeze the HV splitter. Good chance it will bite you.
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