haireez
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Post by haireez on Dec 5, 2016 6:19:27 GMT -5
Hi All,
I recently bought Mike Parker VIM 02 board about 2 months ago and the modification backdated to 2011. Initial impression is that the black level was fantastic and seem sharper than normal VIM that I have.
The only concern for this VIM is that I need to push drive & G2 setting very high and still not able to get the picture at the correct acceptable level for watching movies (quite dim). If I increase the contrast, the picture bloom quite badly because I'm using lug tube. I'm curious if anyone can help to pinpoint which component might impact all 3 tubes drive or G2 level.
I can change and solder any component just to get this VIM board to work correctly. Any feedback will be appreciated.
By the way, I did post the same question at Curt Palmer CRT Forum.
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Post by barclay66 on Dec 5, 2016 7:24:46 GMT -5
Hi, Can You post a picture of the VIM? Maybe I'm able to do a comparison with those two MP-modded VIMs I have. I wouldn't expect too much help from those on the CP forum. MP will possibly say that it works like it is intended to do and can't work well when being used with other neck boards than those it was sold together with. Others might jump in and start bashing You as MP's work still has a special tag attached to it (according to them: This is sacred. You shall not criticize it!). You might want to look up this thread: www.curtpalme.com/forum/viewtopic.php?t=39463Regards, barclay66 |
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haireez
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Posts: 68
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Post by haireez on Dec 5, 2016 8:29:17 GMT -5
I think you're right and that's the reason why I decided to put up the same scenario in this forum. Basically, I bought a match set MP modded VIM and MP modded neck board that is meant for lug tubes from Sparky015. Here is the link: www.curtpalme.com/forum/viewtopic.php?t=39736MP neck board is good with no dimming issues except when I put on the MP VIM, the light output goes very dim that I need to adjust significantly on drive and G2 setting but still not viewable enough. I will put up the photos of the MP VIM but not sure how to do it right now. |
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haireez
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Posts: 68
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Post by haireez on Dec 5, 2016 8:50:26 GMT -5
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haireez
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Posts: 68
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Post by haireez on Dec 5, 2016 8:51:25 GMT -5
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Dec 5, 2016 9:03:50 GMT -5
I read the link that you provided and saw about dimming issues on the VIM too. I did sent email to Mike earlier last week and was told to check Q2 as well but after replacing Q2, the condition did not improve and that's why I decided to post at CP forum and also this forum hoping someone know how to overcome this issues.
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Post by Casethecorvetteman on Dec 6, 2016 0:27:15 GMT -5
Hi, Can You post a picture of the VIM? Maybe I'm able to do a comparison with those two MP-modded VIMs I have. I wouldn't expect too much help from those on the CP forum. MP will possibly say that it works like it is intended to do and can't work well when being used with other neck boards than those it was sold together with. Others might jump in and start bashing You as MP's work still has a special tag attached to it (according to them: This is sacred. You shall not criticize it!). You might want to look up this thread: www.curtpalme.com/forum/viewtopic.php?t=39463Regards, barclay66 Sums it up pretty well, same said for Curt too by quite a few. |
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Post by km987654 on Dec 6, 2016 3:06:39 GMT -5
I have had my dealings with MP and would never go there again.
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haireez
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Posts: 68
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Post by haireez on Dec 6, 2016 5:09:39 GMT -5
I wish that someone here could help me to troubleshoot this MP VIM as it will be a waste of money to buy and not doing the job correctly. Another option is to get back to Sparky015 about this VIM not working right but if I can't really fix this, then that might be the last option.
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Post by mastertech on Dec 6, 2016 11:49:31 GMT -5
I will look over the schematics and see if there is anything I can suggest. But it can be difficult without knowing just what has been butchered on that board.  |
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Post by mastertech on Dec 6, 2016 19:36:23 GMT -5
Well i looked some things over and have some thoughts and questions.
1) Do the internal menus and patterns also look dim?
2) Like always I would first test the rail voltages, +/-14.5v and +/-5v
Just pick a place to test these voltages for now just to see if they are in spec.
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Post by stridsvognen on Dec 6, 2016 19:48:56 GMT -5
Those boards are troublesome, and with MP there is no 2 the same, that miniboard dont work well.. But the issue you have is in general the neckboards that crap out/ gets to noisy when driven to higher output, i dont know why the lug is worse, i seen that to, MP changes some key components on the neckboards that is best left alone, and as they are obserlete + all the other stuff he should not have done its way to troublesome to revers them to a good operation condition.
So my advice is to never buy MP mods if your not capable of reparing them yourself, as i never seen a set of boards where they all worked at the same time. He have made some great stuff, but i never seen it implemented properly, the only thing that is interesting today that MP has made is the later miniboard with the Analog Device 16-TSSOP switcher on it. The rest seems to introduce more problems than it solves.
With a few small changes to a good set of old style neckboards you will have a better neckboard than Mike has ever made, only thing you need is a 130 ohm resistor, the rest is removing some parts.
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Post by stridsvognen on Dec 6, 2016 19:51:12 GMT -5
Normaly you get a very dim image if Q2 on the vim go bad, but then i dont think you can drive it to bloome. Its worth checking as they gone bad on about 30% of all the Vim MP moddet, never seen one fail on a standard vim.
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haireez
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Posts: 68
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Post by haireez on Dec 7, 2016 10:35:10 GMT -5
Hi mastertech, the internal menus doesn't look dim to me. Only the picture quite dim. My initial contrast & brightness setting is 45 for both. But if you put MP VIM, I need to increase contrast & brightness to 60 but the picture brightness is still not as bright as my normal VIM with setting at 45. But if I increase the contrast further, the picture bloom quite badly, maybe due to lug tubes.
By the way, how do you check the rail voltage?
As for 130 ohm, which component do I need to change?
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Post by stridsvognen on Dec 7, 2016 11:05:10 GMT -5
As for 130 ohm, which component do I need to change? First you need a few sets of standard old style neckboards, prefered from a non ultra machine. |
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