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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Fri Aug 16, 2024 5:29 pm Post subject: BG1209s picture brigthness fading quickly |
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Hello,
I create a new topic following this one: https://www.curtpalme.com/forum_archived/viewtopic.php@t=43385.html because I have now no picture when I start up the pj. After replacing the rgb driver boards to try to fix the issue of the previous topic, I had a picture for arounf 10 minutes, then the red brightness starts to deline, then the blue one and finally the green one as well. Quickly the picture becomes black.
I restarted the pj, but the picture is displayed but very quickly the picture becomes black again.
The display of the menu is also affected: no visible display.
On the G2 board all the lightened leds are green.
I also have the following red leds: StdBy Power, Main Power, Processor Cycles (flashing) and Block Match.
Thanks for your help.
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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 Aug 16, 2024 6:48 pm Post subject: |
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That's a new one on me. What I would do is disconnect two of the CRT sockets/video amps from the projector, and only run one tube at a time. When it goes black, does the focus go bad, and the picture gets bigger as it fades out? If so, then it's a HV problem. If the focus stays good, and the picture doesn't get larger as it fades out, then it's a video problem.
It's possible that one video amplifier has a problem with the AKB circuit, and is shutting down the set.
See if you can get the set running with only one tube connected, and then try each tube one at a time. IF that works, then try 2 tubes, etc.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Fri Aug 16, 2024 9:51 pm Post subject: |
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Curt, it was the rgb driver board: I replaced it with the original one and the issue has gone. But I am now back to my previous issue: after around 10min, the picture goes black for a few seconds with a crackling noise. This issue appears more often as the movie goes until it stays black or restarts the pj automatically  .
Unfortunately, I do not have any other spare rgb driver board to use. So, do I need to buy one or could I try something else before?
Thanks again for your help.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Aug 17, 2024 6:32 am Post subject: |
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I guess this is a problem with both the GBR board and the driver board malfunctioning. Since the driver board has been replaced, the remaining BGR board also needs to be checked.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Aug 17, 2024 6:36 am Post subject: |
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| bluemoonhu wrote: | | I guess this is a problem with both the GBR board and the driver board malfunctioning. Since the driver board has been replaced, the remaining BGR board also needs to be checked. |
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Aug 17, 2024 10:48 am Post subject: |
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| bluemoonhu wrote: | | I guess this is a problem with both the GBR board and the driver board malfunctioning. Since the driver board has been replaced, the remaining BGR board also needs to be checked. |
I am trying to figure out what can cause "the intermittent black image with crackling noise".
I tried what Curt suggested: use contact cleaner on the V position switch (yoke board), wiggle the H width trimpot on the SMPS board (the H width is currently set to maximum position) and even change the SMPS board. The issue is still there.
I also tried what Curt suggested at the first place: reseat the vertical board and it worked for a few months but not anymore.
I then tried what you suggested: replace the rgb driver boards, but my spare is faulty.
So as I do not have any working rgb boards spares and no vertical board spare, what is the one that I should find/buy first?
The reseated vertical board worked for a while but not anymore, Does it mean that a new vertical board could fix the issue?
Thanks.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Aug 17, 2024 12:15 pm Post subject: |
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Don't worry about not being able to find spare parts, the R762719 and R762720 are also used on the Baco 808S and are widely supplied in the market without being expensive
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Aug 17, 2024 2:14 pm Post subject: |
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| bluemoonhu wrote: | | Don't worry about not being able to find spare parts, the R762719 and R762720 are also used on the Baco 808S and are widely supplied in the market without being expensive |
Ok, I'll try to find them.
I also tried again to reseat the vertical def. board and then it lasted 75 min before going black instead of 10 min. The projector seemed to restart a few times after that automatically but failed to do it.
I was wondering what is the logic behind the reseat of this board that could change the duration of the issue to occur.
Any idea?
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Aug 17, 2024 8:11 pm Post subject: |
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| Corleone88 wrote: | | bluemoonhu wrote: | | Don't worry about not being able to find spare parts, the R762719 and R762720 are also used on the Baco 808S and are widely supplied in the market without being expensive |
Ok, I'll try to find them.
I also tried again to reseat the vertical def. board and then it lasted 75 min before going black instead of 10 min. The projector seemed to restart a few times after that automatically but failed to do it.
I was wondering what is the logic behind the reseat of this board that could change the duration of the issue to occur.
Any idea? |
I did a few other tests that maybe can help to find the cause.
I started a movie this afternoon after one day with the projector unplugged. It lasted around 75min without the issue. Then I tried again this evening after around 6 hours unplugged. It lasted 30 minutes before going black. But instead of hearing noises during a few seconds, the projector tried to restart a few times (quick start/stop 3 or 4 times) and manage to restart normally and display the movie. Then after 5 minutes, it goes black again and try to restart many times without success. I then shut the pj down.
It looks like it lasted longer if the projector has been not used for a while, but if it is still hot (even after reseat of the vertical and horizontal boards), it lasts less longer.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun Aug 18, 2024 11:30 am Post subject: |
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If the projector can display images after turning on, then the GBR board should be good. If the projector restarts repeatedly, I still suspect that the driver board is unstable
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Mon Sep 09, 2024 5:21 pm Post subject: |
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I bought and replaced both boards (R762719 and R762720) but I still have the same issue...
What I can do/try next? Thanks for your help.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue Sep 10, 2024 6:34 am Post subject: |
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I have never encountered such a malfunction before, so my advice to you is only speculation. There shouldn't be any major issues with the machine, it's just the unstable working state caused by aging components. If it is me, I will check the SMPS board next.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sun Sep 15, 2024 9:16 am Post subject: |
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| bluemoonhu wrote: | | I have never encountered such a malfunction before, so my advice to you is only speculation. There shouldn't be any major issues with the machine, it's just the unstable working state caused by aging components. If it is me, I will check the SMPS board next. |
I already tried that unfortunately. Is there any chance that is caused by:
- Vertical board def
- Quadrupler
- EHT
- Deflection switching board
I have some spares left but I do not have spares for the Vertical board or the quadrupler. I will have to buy them if it can be the solution of the issue.
Thanks.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Mon Sep 16, 2024 5:21 pm Post subject: |
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I currently have a EHT R762716 with Quadrupler R762833.
But I have different EHT spares: R7617427 and R7627165-07
For the quadrupler I have a 761743.
Which ones are compatible with my current configuration?
Thanks
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue Sep 17, 2024 5:21 am Post subject: |
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| Corleone88 wrote: | I currently have a EHT R762716 with Quadrupler R762833.
But I have different EHT spares: R7617427 and R7627165-07
For the quadrupler I have a 761743.
Which ones are compatible with my current configuration?
Thanks |
new eht
http://www.curtpalme.com/docs/BarcoServiceBulletin_R762716_New_EHT.pdf
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue Sep 17, 2024 5:49 am Post subject: |
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| Corleone88 wrote: | | bluemoonhu wrote: | | I have never encountered such a malfunction before, so my advice to you is only speculation. There shouldn't be any major issues with the machine, it's just the unstable working state caused by aging components. If it is me, I will check the SMPS board next. |
I already tried that unfortunately. Is there any chance that is caused by:
- Vertical board def
- Quadrupler
- EHT
- Deflection switching board
I have some spares left but I do not have spares for the Vertical board or the quadrupler. I will have to buy them if it can be the solution of the issue.
Thanks. |
I have never seen the EHT board and the quadrupler break down and the machine still run normally. Your machine only shows signs of malfunction after normal run, so I believe it is a reaction of overheating, such as the failure of a heat-resistant component.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Thu Sep 19, 2024 6:54 pm Post subject: |
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| bluemoonhu wrote: | | Corleone88 wrote: | | bluemoonhu wrote: | | I have never encountered such a malfunction before, so my advice to you is only speculation. There shouldn't be any major issues with the machine, it's just the unstable working state caused by aging components. If it is me, I will check the SMPS board next. |
I already tried that unfortunately. Is there any chance that is caused by:
- Vertical board def
- Quadrupler
- EHT
- Deflection switching board
I have some spares left but I do not have spares for the Vertical board or the quadrupler. I will have to buy them if it can be the solution of the issue.
Thanks. |
I have never seen the EHT board and the quadrupler break down and the machine still run normally. Your machine only shows signs of malfunction after normal run, so I believe it is a reaction of overheating, such as the failure of a heat-resistant component. |
Well at the end the pj shuts down, but it does not happen after the first black image display but later on.
Could this heat-resistant component be located on the convergence tray or on the vertical deflection board? Thanks again for your help 
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Sep 21, 2024 8:58 am Post subject: |
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Sorry, I don't have the correct answer. You can only find the source of the fault by replacing the board.
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