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Post by barclay66 on Dec 8, 2016 4:03:31 GMT -5
Hi,
One of my MP-modded VIMs (see pictures named VIM01) seems to be similar to Yours. I can test it in order to find out if its video level is low too.
Nevertheless, I don't think that it will make much sense poking around with all of this black goo at key areas. The operational amplifiers of the first stage have been replaced with unknown chips (markings have been sanded off), so we don't know which resistors attached to them will result in how much gain. Then there is the mini-board where the situation is similar.
Reverse engineering with schematics and datasheets can be difficult already. With none of them it becomes a nightmare.
I'd recommend that You either work out a solution with Mike Parker directly (if he's willing to support this) or try to return the board as it can't be of use to You.
Regards,
barclay66
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Post by barclay66 on Dec 8, 2016 4:04:28 GMT -5
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Post by barclay66 on Dec 8, 2016 4:05:25 GMT -5
Pictures of VIM02. This one is completely different... |
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haireez
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Post by haireez on Dec 8, 2016 5:40:36 GMT -5
I think it would be difficult to return the VIM back as I have replaced the RCA connectors unless I can find the same original connector and resolder them back. As for Strid I do have plenty of VNB as spares. 3-4 sets, if you can show me the 130ohm, then I could do the improvements. Barclay, Do you have plan to come over in Singapore or Malaysia again? If yes, I could pass both VIM and VNB to you. |
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Post by stridsvognen on Dec 8, 2016 6:04:20 GMT -5
Hi, One of my MP-modded VIMs (see pictures named VIM01) seems to be similar to Yours. I can test it in order to find out if its video level is low too. Nevertheless, I don't think that it will make much sense poking around with all of this black goo at key areas. The operational amplifiers of the first stage have been replaced with unknown chips (markings have been sanded off), so we don't know which resistors attached to them will result in how much gain. Then there is the mini-board where the situation is similar. Reverse engineering with schematics and datasheets can be difficult already. With none of them it becomes a nightmare. I'd recommend that You either work out a solution with Mike Parker directly (if he's willing to support this) or try to return the board as it can't be of use to You. Regards, barclay66 There is no point in reverse engeneere any of this stuff. All you need is a switcher.. run straight from the dac into the switcher, and out of the switcher into the AD 835.. end of that.. you can bypass/ remove everything in the videochain from the DIN 96 plug untill the AD835 as long as you dont touch the sync. You also need to remove all the bufferstage for the internal generator, and run that directly into the switcher, just see to it has a clamping cap in the line and gets terminated 75 ohm at the switcher, and all the low level noise you know from the Marquee is gone, no more lines or funky stuff. There will be a dim vertical line left on the right side of the tube looking into the lens, its the blanking line, it will move when adjusting the blanking, it can be set to shoot into the screen frame, i doubt it will be possible to make it out on the screen. Then its possible to run the dac/ moome card at its 0-255 setting, running it 0-0,7v out for a perfect low level performance, and dynamic range. without having to worry about clipping away all the low level noise by elevating the reference level and lowering the G2/brightness in the Marquee. |
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Post by barclay66 on Dec 8, 2016 7:18:15 GMT -5
I think it would be difficult to return the VIM back as I have replaced the RCA connectors unless I can find the same original connector and resolder them back. Too bad. Sorry, but that investment won't yield anything valuable. You still might try to arrange something with Mike Parker directly. Good Luck! If You are desperately in need of a VIM, I have some spares (untouched stock boards). Do you have plan to come over in Singapore or Malaysia again? If yes, I could pass both VIM and VNB to you. Maybe we can manage to spend our Easter holiday in Malaysia. Not quite sure about flights and budget yet. Regards, barclay66 |
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haireez
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Posts: 68
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Post by haireez on Dec 8, 2016 9:24:50 GMT -5
Hi Barclay,
I have many spare boards for my 9518LC. The only disappointment is that I thought MP VIM & VNB would be a great upgrade but it seems useless which is my greatest regret now. Unless I can achieve brightness back like normal VIM.
As for your Easter holiday trip, do let me know if you're in Malaysia. Looking forward to meet you again someday.
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haireez
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Post by haireez on Dec 9, 2016 19:50:12 GMT -5
Guys,
Yesterday I changed MP VNB with a different VNB (old type on blue & VDC VNB on green & red). Since the picture is still dim, I decided to adjust the contrast on Moore V3 HDMI card by turning counterclockwise.
By doing this, I'm able to get the brightness level and I'm quite glad now.
The only worry I have is that if I change back another VIM, the setting on Moome card is all wrong and I'm not sure how to adjust it back to the correct setting of 0.7v.
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haireez
Unmoderated Off Topic
Posts: 68
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Post by haireez on Dec 10, 2016 14:59:44 GMT -5
Guys, after getting the same brightness, I find that Mike's VIM is an excellent upgrade as now I can see that the color are better and more natural. The text does not bloom as it used to be before. It's really a great pice of work by Mike. I wonder what the latest VIM picture quality as compared to this one.
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Post by stridsvognen on Dec 10, 2016 18:39:51 GMT -5
Whats the measured light output and gamma now and before.? And do i understand right that your using the pictured MP vim and a mix of new and old style neckboards.?
What were you using before? neckboards and vim.?
The last 5 MP vims i seen with the same miniboard using the same Analog Device switcher was all different, most of them did not work right, noise issues, or no image at all.. When sorted out, adding the resistors needet, cutting the traces , and removing the components randomly forgotten, and removing the shorts by solderblobs, or pins addet but bend and short something, or cut off the component legs on the back side that was forgotten and bend when pushed into the tray the first time, its a great board.. The only problem is that it dont very often work, and you end up shipping and waiting months if not years, if you ever get it.. I prepayed mods over a year ago.. with a NIB NOS 9518, mounted and calibrated it in Mikes basement.. This summer i was found not worthy of Mikes mods, so i never recived anything.. And it seems he decidet the projector is now his, and he dont have to pay for it.
The point is.. If you want to test your luck buying a set of mods from MP, ill recommend you not to pay a single $ before you have it in your hand working..
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haireez
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Post by haireez on Dec 10, 2016 23:49:03 GMT -5
Before I got MP VIM & MP VNB, I was using VNB 50-2038-01P on blue tube, VNB 2-270340-01B on green & red tubes. I have another VNB 81771-02H but it's not compatible with other VNB. So no choice but to use modified 2038 for my lug tubes.
Once I received MP match set, I change the VNB first but can't tell the difference but the light output is not affected.
After that, I changed the VIM and was shocked to see the light output decreased significantly that I need to push the contrast, brightness, G2 and Drive setting. Initially I thought that the MP VIM is a faulty set. But now after adjusting Moome V3 input card for contrast setting, no longer 0.7v setting, and after eye calibration again, I found the picture to be very clean, more detail, more natural color etc... And very happy with the unit now. I will not change back to MP VNB at this moment.
Unfortunately, I don't know how to measure the light output right now even though I have eye one colorimeter that I bought many years back. If you could guide me, I can try to measure.
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haireez
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Posts: 68
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Post by haireez on Dec 11, 2016 0:16:02 GMT -5
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haireez
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Posts: 68
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Post by haireez on Dec 11, 2016 0:18:02 GMT -5
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haireez
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Posts: 68
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Post by haireez on Dec 11, 2016 0:19:30 GMT -5
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Post by gregstv on Dec 11, 2016 0:40:42 GMT -5
Before I got MP VIM & MP VNB, I was using VNB 50-2038-01P on blue tube, VNB 2-270340-01B on green & red tubes. I have another VNB 81771-02H but it's not compatible with other VNB. So no choice but to use modified 2038 for my lug tubes. Once I received MP match set, I change the VNB first but can't tell the difference but the light output is not affected. After that, I changed the VIM and was shocked to see the light output decreased significantly that I need to push the contrast, brightness, G2 and Drive setting. Initially I thought that the MP VIM is a faulty set. But now after adjusting Moome V3 input card for contrast setting, no longer 0.7v setting, and after eye calibration again, I found the picture to be very clean, more detail, more natural color etc... And very happy with the unit now. I will not change back to MP VNB at this moment. Unfortunately, I don't know how to measure the light output right now even though I have eye one colorimeter that I bought many years back. If you could guide me, I can try to measure. if you have a cro put up a white test pattern an measure the output of the moome on the green. I connect to the bnc connector on the input of the projector. it would be interesting to see how much above 0.7v you are. |
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