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50" Rear projection Monitor Swap - OutRun 2 SP DLX

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    Posted: 05 Aug 2020 at 10:00pm
Search for Holographic Rear Projection Film. A local estate agents had some attached to some hanging signage in their window lit up by a pico projector, it looked pretty good :) seemed to be a fairly even and bright image. Only issue could be that for a 50" screen you probably want to get the  152cmx131cm and that is about £100 in UK or about 65 dollar from china :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2020 at 8:49pm
It's fairly clear at least....

This is the Megalo thread I mentioned: 

I don't see the name of a material actually mentioned though...



Edited by John Bennett - 03 Aug 2020 at 8:49pm
http://www.philwip.com -sibling 'fix-off' (I’m losing by miles).
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orphanzombie Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2020 at 8:38pm
So just got out the fresenal lens but the brightness isnt as uniform which i guess what it was there for the middle of the screens very bright but the top is very low the picure i linked shows the issue well but makes it look a little worse.

Is there a different material that can be used instead of this lenticular?

http://imgur.com/gallery/WCy6trF
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2020 at 5:40pm
Yeah, it's definitely better than having a converter involved.

Great research anyway - the more cabs that can stay 50" 4:3 the better (even if it's a shame to consign mirrors and fresnels to the cupboard).

Can you remember what material you used, Sbdesign? 
You can get replacement lenticular rear projection sheets, I believe, which at least makes it look authentic from the outside (and brighter that just a white sheet). 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orphanzombie Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2020 at 5:28pm
Thats with the backs completely off too so i havent put it back together il try without the fresenal tommrow same with the back wood piece back on.

Lag is not an issue i was playing fine even with those red soldier bastards jumping out i didnt notice any lag a converter like those cheap gbs8000 or whatevers probably would add a little lag too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sbdesign Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2020 at 5:23pm
Ive also used rear projection material, stretched around a frame and slotted in.  I too had issues with fresnel. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2020 at 5:09pm
Hmm. It's great it's 50", 4:3 and does 15kHz without an adaptor, but yeah, the picture's not overwhelming.

Are those pcitures with the back on the monitors to stop stray light.

It might be that the fresnel doesn't help at all and you'll have to remove it - I presumed they're there to straighten the light from the 3 CRTs, but as this is a single light source, I can see how it could cause distortion.
Is it a 2-part screen like TVs, so there's the fresnel and then a lenticular sheet on the very front? The sheet alone might be enough.
You can also get plastic sheets intended for rear projection setups - there's guys playing with them on the Megalo410 restoration thread on Arcade Projects.

I think I need to buy one of these NEC's for a play anyway, they're cheap enough second hand. Wonder what the lag is...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Orphanzombie Quote  Post ReplyReply Direct Link To This Post Posted: 01 Aug 2020 at 3:30pm
So i have fitted 2 of the projectors i got which are um280x had okay results but havent taken much time to tune it and really have jusy plonked them in due to time.

I have linked what i have got so far image isnt yhe best but this is due to the lenses f**king up the image as when paper is placed on the inside of the machine the image is good.

The projectors i used can take 15khz no problems and it didnt glich out and not properly sync

http://imgur.com/gallery/OXp4FDS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jul 2020 at 6:34pm
Hmm, I'm not sure. 
Like the other Benq, it's not an ultra-short- throw, so it won't fit inside the monitor - it would have to stick out the front (with the image reflecting off the mirror).
They keystone is also only 30", so it might not produce a square image.
And it's £500

I think removing the mirror and trying to fit a used NEC (for <£100) would be safer experiment. If it doesn't display 15kHz, then try an OSSC or a cheaper image scaler. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfs9999 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jul 2020 at 11:27am
Thank John Bennett, good explanation!

So  the Benq MW621ST can display 15 khz source ( because i wan't to use my Mame box in 15khz) isn't it? This model seems to be hard to find ?

Do you know is the Benq MW632ST is also a good projector to use ?


Edited by jfs9999 - 26 Jul 2020 at 11:57am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2020 at 10:27pm
Sorry for the delay. There's a danger I'll end up repeating what I've said before, but some thoughts.

If you want to put the projector where the CRTs go (at the bottom, pointing onto the mirror), then you need: 

4:3
Throw: 0.62:1 (or shorter)
Keystone +/- 40 degrees

As for the minimum display frequency, ideally something that lists 15kHz and 24kHz if you want to play JAMMA and medium-resolution stuff. Failing that, you'll have to add a a frequency converter board (which is a mixed bag - OSSC sounds the best as it's least lag and emulates scanlines).

Sadly, I don't think there's many projectors that do that massive keystone. The Benq MW621ST does and there's at least one Acer that does, but otherwise I don't know - I'll have to look at some databases.

However... I think the projector's behind ends up sticking out of the front of the cab, which you could get away with a Megalo410 or a Daytona, where the console is pushed upto the screen, but in a Megalo50  and some other cabs, that's not viable.

So, I think you might have to experiment by removing the mirror and projecting from the rear, as in the HOT3 cab.

The depth of a Megalo50 is about 60cm, so you want something that can focus at comfortably less than that 50cm (including the length of the projector).
The throw is the projection distance (e.g. 50cm) divided horizontal size of the monitor (about 40 inch = 100cm), so 0.5 or lower.

The NEC UM280x is the projector being used in the HOT3 thread- might be worth asking orphanzombie if he's made more progress and how it looks now. The specs do say it can fit inside a Megalo comfortably.
It's all a bit experimental, so I'd go for a second hand unit off eBay for around £100 - you don't want to spend hundreds.
There's a few of the NECs on eBay, all under £100. The price reflects the lamp hours used. I think you can get replacement lamps for a reasonable price (but do check) 
I can't promise it'll work perfectly - I should buy one myself for a play around, but I don't have a 50" cab. It MIGHT work with 15kHz, otherwise you'll need a converter.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfs9999 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2020 at 12:56pm
@John bennett : some news?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote david656 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 11:22am
Just to echo previous discussions with John and others, I have a HOTD2 super deluxe that I want to fit some sort of 50" rear projection option, and it needs to have VGA. 

Thanks :D
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfs9999 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 10:18am
Thanks John!

I ve read the topic about HOD3 but can't find a good VP reference.


Edited by jfs9999 - 20 Jul 2020 at 10:21am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 9:50am
Originally posted by jfs9999 jfs9999 wrote:

Hello John Bennett.

Do you know (reference) a good ultra short projector that can be put inside a 50" 4/3 cabinet (15khz)? I want to replace my faulty Mitsubishi projector in my sega megalo cabinet. 
Thank for your advises. 

Yeah, please keep the projection! There was a lot of discussion in this thread though:

In short, if you want to keep the mirror and put the projector near to the original CRTs go, then you need a keystone of 40 degrees (a lot). But you can do it from behind without the mirror using an even shorter throw projector. 

I'll have a think and get back to you. 


Edited by John Bennett - 20 Jul 2020 at 9:51am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jfs9999 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jul 2020 at 9:28am
Hello John Bennett.

Do you know (reference) a good ultra short projector that can be put inside a 50" 4/3 cabinet (15khz)? I want to replace my faulty Mitsubishi projector in my sega megalo cabinet. 
Thank for your advises. 


Edited by jfs9999 - 20 Jul 2020 at 9:31am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote John Bennett Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2020 at 10:52pm
Finding a 50" 4:3 rear-projection TV is incredibly hard. I've seen maybe a couple in a year.

Finding one that's also VGA resolution is near impossible, sadly.

I know I mentioned it on the other thread, but putting an ultrashort projector inside the existing 50" 4:3 monitor box is pretty-much making your own rear-projection monitor.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sosfx Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2020 at 10:21pm
Quality mate, it looks amazing. I did think about doing this when I was sorting out my 50' cab but went with a projector in the end, couldn't find any 50' TV's at all. think that most have gone to landfill :(

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Post Options Post Options   Thanks (0) Thanks(0)   Quote nurtuo Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2020 at 2:31pm
Originally posted by muddymusic muddymusic wrote:

Yeah - kept the bloody cab LOL
 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddymusic Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2020 at 2:07pm
Yeah - kept the bloody cab LOL
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