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opv
Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel
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| Posted: Mon Aug 26, 2019 6:45 am Post subject: BG1209s left side is shaking |
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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: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Mon Aug 26, 2019 2:50 pm Post subject: |
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Can you post a video of the problem?
thanks!
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Aug 26, 2019 6:54 pm Post subject: |
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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
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| Posted: Tue Aug 27, 2019 6:46 am Post subject: |
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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
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Sep 02, 2019 6:02 am Post subject: |
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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
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| Posted: Wed Oct 02, 2019 9:50 am Post subject: |
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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: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Oct 02, 2019 2:14 pm Post subject: |
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Good to know thanks, never seen that problem before.
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opv
Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel
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| Posted: Fri Oct 04, 2019 11:15 am Post subject: |
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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: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Fri Oct 04, 2019 2:06 pm Post subject: |
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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
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| Posted: Fri Oct 04, 2019 2:46 pm Post subject: |
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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: 1356
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| Posted: Fri Oct 04, 2019 11:28 pm Post subject: |
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Or grounding, or dodgy connection.
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opv
Joined: 18 May 2010
Posts: 202
Location: Emek Hefer,Israel
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| Posted: Sat Oct 05, 2019 8:53 am Post subject: |
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So, how do I troubleshoot this problem?
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