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BG1209s left side is shaking

 
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Mon Aug 26, 2019 6:45 am    Post subject: BG1209s left side is shaking Reply with quote


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Hi everyone,
I have a problem with my 1209s that started a few weeks ago.
Once in a while, the left side of the picture starts shaking towards the middle, it's like left side blanking. the problem comes and goes.
I know the drill, I have to pull out board by board and replace them until the problem disappears.
I was hoping you guys can help me with the immediate suspects.

Thanks,
Or
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Aug 26, 2019 2:50 pm    Post subject: Reply with quote

Can you post a video of the problem?
thanks!
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gjaky




Joined: 05 Jun 2010
Posts: 2789
Location: Budapest, Hungary


PostLink    Posted: Mon Aug 26, 2019 6:54 pm    Post subject: Reply with quote

I had similar issue on my NEC XG there the retrace setting relay had contact problems. I am sure the 1209 also have such relay on the H deflection board, other than that the scan reversal switch or any connection relating to horizontal deflection can be suspected.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Tue Aug 27, 2019 6:46 am    Post subject: Reply with quote

Hi Curt,
I'll post a video once I catch the problem. It didn't happen yesterday.

Hi gjaky,
I guess I'll start by replacing the H deflection board.

Thanks,
Or
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Sun Sep 01, 2019 7:18 am    Post subject: Reply with quote

Hi,
Here is a link to a video of the problem during warm up.
The flicker isn't relevant of course, only the left side shaking:


https://www.icloud.com/attachment/?u=https%3A%2F%2Fcvws.icloud-content.com%2FB%2FAXKGV4bZtFX93fV_Um8xENXkokeXAZ99cHkuV8BmkkMI21eW98NRlEgP%2F%24%7Bf%7D%3Fo%3DAjEIPnA2t2nUQq7vSw6iTBHocSMh7InPQHyjScmqKr_U%26v%3D1%26x%3D3%26a%3DCAogjSV8yXXHRd9dGtn5LNbEGzucDSPAbwbcMYEGCMyL_hUSJxCftLLdzi0Yn8StsdgtIgEAKggByAD_X4i261IE5KJHl1oEUZRIDw%26e%3D1569914053%26k%3D%24%7Buk%7D%26fl%3D%26r%3D8C733E3D-A153-47C0-AC08-3CA6E8A8677C-1%26ckc%3Dcom.apple.largeattachment%26ckz%3D5272203D-C0C1-4C85-98C9-A2A49FE2E211%26p%3D40%26s%3DToc6w7CBoDJouM7esu_Qax4pO8E&uk=mn1jTGIpF_hYESv7V0ODjg&f=IMG_2956.MOV&sz=74119452
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gjaky




Joined: 05 Jun 2010
Posts: 2789
Location: Budapest, Hungary


PostLink    Posted: Mon Sep 02, 2019 6:02 am    Post subject: Reply with quote

Hm, it is more violent than I thought, this is not the connecteors for sure, more over it has nice sinusoidal response, so it really could be a whacky blanking signal.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Wed Oct 02, 2019 9:50 am    Post subject: Reply with quote

Hi,
I got to work on the problem during the weekend, the problem disappeared when I replaced the RGB Switching card (with the attached QUAD Decoder).
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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 Oct 02, 2019 2:14 pm    Post subject: Reply with quote

Good to know thanks, never seen that problem before.
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Fri Oct 04, 2019 11:15 am    Post subject: Reply with quote

Well, the problems are not 100% over yet.
Now I have a very strange problem:
If I keep the PJ's chassis back door open, everything works fine, tested for days.
If I close the back door, after a few minutes the picture starts to distort and looses lock of the input signal, with no way to bring it back.

I have a feeling this is some how related to the boards I replaced, but maybe I'm wrong.
Any thoughts?
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Fri Oct 04, 2019 2:06 pm    Post subject: Reply with quote

Can you post a video of that? My suspicion is an arcing HV quadrupler.
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Fri Oct 04, 2019 2:46 pm    Post subject: Reply with quote

Well, it happens fast.
Some of the vertical/horizontal lines are becoming diagonal and then I get a black screen and source not available message.
I can hear a high pitch noise from the cards I replaced, like it is trying to re-lock on the source with no success.
since it's working properly with chassis open, doesn't this mean this is related to sensitivity of the replacement boards to heat?
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HaydnG90




Joined: 22 May 2006
Posts: 1335



PostLink    Posted: Fri Oct 04, 2019 11:28 pm    Post subject: Reply with quote

Or grounding, or dodgy connection.
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opv




Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel


PostLink    Posted: Sat Oct 05, 2019 8:53 am    Post subject: Reply with quote

So, how do I troubleshoot this problem?
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