haireez
Unmoderated Off Topic
Posts: 68 
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Post by haireez on Jul 4, 2017 8:36:44 GMT -5
Hi,
Seek help here if anyone know what is causing my Marquee to loses all internally generated video. It seems that watching videos are not affected at all which is a good thing. But it's a problem for calibration as the green lines can't be seen for you to align blue or red tube to green tube.
Appreciate any help from this forum.
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Post by gjaky on Jul 4, 2017 8:46:13 GMT -5
Most likely the VIM is acting up, Try an other VIM.
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Post by barclay66 on Jul 5, 2017 3:40:08 GMT -5
Most likely the VIM is acting up, Try an other VIM. Yes. Most likely the VIM where the video is being switched. Another possibility would be the CLM where the menus and test patterns are being generated. The least probable element would be the backplane where the VIM and the CLM are plugged into (contact problem). It would be wise checking the VIM's and CLM's edge connectors though... Regards, barclay66 |
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Jul 6, 2017 10:37:25 GMT -5
Yes, it's the VIM that is causing this. After replacing a new VIM, everything works perfectly. Any idea which part or component causing this issue?
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Post by stridsvognen on Jul 6, 2017 10:49:59 GMT -5
All 3 colors are gone on the internal.? I have only experienced issues with MP moddet vims, and then its normaly a short somewhere or the new ADG 1233 switcher he uses on the miniboard.
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Post by barclay66 on Jul 6, 2017 11:11:52 GMT -5
Hi,
Check U32 (74AC86). It's the only single IC involved. All other switching for red, green and blue is done with separate ICs (U13, U19, U25). If one of them failed You would only be missing the corresponding color of the internal video (not likely that all three fail at the same time)...
Regards,
barclay66
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Jul 6, 2017 18:10:12 GMT -5
You're right Barclay, it's only the green and others are fine. And yes, it's on MP modded VIM.
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Post by stridsvognen on Jul 7, 2017 17:45:15 GMT -5
You're right Barclay, it's only the green and others are fine. And yes, it's on MP modded VIM. thats quite normal.. They are normaly pretty flaky, I would try replace the ADG1233 switcher first, its also normal thet MP forgets some of the terminations, so if you have a good hi res image of the vim, of the miniboard and around, i might see it.. Unless you got one of the epoxy potted ones, then there is most likely no saving it. |
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Post by stridsvognen on Jul 11, 2017 14:13:17 GMT -5
Which of these 4 VIM look most like yours.?  |
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Jul 12, 2017 7:51:16 GMT -5
My MP board is not as complicated as yours. By the way, where to locate ADG1233 switcher?  |
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Post by stridsvognen on Jul 12, 2017 8:25:48 GMT -5
Yours is a old one, i would leave that one alone, and just use a external grid pattern to converge, and forget about the internal green.
There is no ADG1233 switcher on yours, it has 3 switchers located on the miniboard.
Some of mine is ½ decent, and kind of simple, just going straight from the moome card to the switcher, skipping all the front stage.
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Jul 12, 2017 8:37:25 GMT -5
OK. If that's the case, I would swapped ic U32 then as per Barclay advise.
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Jul 12, 2017 8:38:44 GMT -5
By the way, is there anyway that I can improve my MP VIM like yours?
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Post by stridsvognen on Jul 13, 2017 16:02:49 GMT -5
By the way, is there anyway that I can improve my MP VIM like yours? The one you have there is not worth the time, you would have to start by removing all existing mods, and at that point it would be better to start on a fresh, at this point your best option is to hang on and see how everything goes with Gjakys new boards. The other option cant mod 2 boards without destroying at least 1 of them, and lately he has been so paranoid, that he has put so much epoxy potting on the shorts and things he forget or do wrong that it cant be saved.. The best of the options is the later ones with the ADG1233 switcher, if they are not potted to deadth, its actually possible to fix thise boards, and solve al the new problems created, and old ones not solved. Last contact i had with his handy work was a cap mod on a LVPS, wich he manage to put some of the caps wrong and short the LVPS.. Its such a simple operation, and so simple to test, and still it became a huge clusterfuck. |
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Post by barclay66 on Jul 14, 2017 2:39:36 GMT -5
OK. If that's the case, I would swapped ic U32 then as per Barclay advise. Hi, Maybe I didn't describe this correctly: U32 could be causing the problem if ALL colors were missing. If only one color is missing, then U32 wouldn't have anything to do with it. On a stock VIM I would check U19 (SD5401 switcher). As Your board has been modded, it could be possible that U19 is missing or has been bypassed. In this case, the solution depends on the type of mod that has been applied and it could be possible that it can't be repaired without un-potting or replacing the mini board. In this context, Kurt's advice makes a lot of sense... Regards, barclay66 |
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