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BG1209/2, flickering brightness at startup and H size drift

 
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winny




Joined: 09 Oct 2013
Posts: 403
Location: Sweden

TV/Projector: BD808s, BG1209/2


PostLink    Posted: Tue Jun 30, 2015 10:41 am    Post subject: BG1209/2, flickering brightness at startup and H size drift Reply with quote


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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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barclay66




Joined: 27 Jun 2011
Posts: 1291
Location: Germany

TV/Projector: Marquee 9500 Ultra


PostLink    Posted: Tue Jun 30, 2015 12:04 pm    Post subject: Reply with quote

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!


PostLink    Posted: Tue Jun 30, 2015 2:08 pm    Post subject: Reply with quote

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


PostLink    Posted: Wed Jul 01, 2015 5:10 am    Post subject: Reply with quote

Examine the boards close up, check the solder joints
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winny




Joined: 09 Oct 2013
Posts: 403
Location: Sweden

TV/Projector: BD808s, BG1209/2


PostLink    Posted: Wed Jul 01, 2015 12:02 pm    Post subject: Reply with quote

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.

_________________
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!


PostLink    Posted: Wed Jul 01, 2015 4:51 pm    Post subject: Reply with quote

It might be the HV splitter. Taking a guess here though.
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gregstv




Joined: 27 Aug 2007
Posts: 628
Location: Australia


PostLink    Posted: Wed Jul 01, 2015 8:36 pm    Post subject: Reply with quote

I would not freeze the HV splitter. Good chance it will bite you.
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