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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Thu Aug 20, 2020 2:30 pm 


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Joined: 26 Dec 2017
Posts: 129
Quote:
Perhaps look into trying out a X-Vue Gamma Boost / HDFury GammaX unit. I need to try mine out on some more 15kHz displays, it seems like it may only be intended for 31+ kHz but I'm not 100 percent certain.


Interesting! Yeah, if you could test it for me on 15khz and show me some comparison pics, that would be greatly appreciated.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Thu Aug 20, 2020 5:35 pm 


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Joined: 05 Nov 2019
Posts: 597
Location: Massachusetts, USA
Logan Jones wrote:
Quote:
Perhaps look into trying out a X-Vue Gamma Boost / HDFury GammaX unit. I need to try mine out on some more 15kHz displays, it seems like it may only be intended for 31+ kHz but I'm not 100 percent certain.


Interesting! Yeah, if you could test it for me on 15khz and show me some comparison pics, that would be greatly appreciated.


https://www.instagram.com/p/CEHqAval0Gy/

Okay, works fine on 15kHz 'csync' too. Difference is more noticeable IRL, my CRT is already pretty vibrant but it helps a lot with making shit vibrant while retaining black levels, I can assure. Look at the world map in the background behind the character portraits for a good example

It is VERY noticeable if you're using OSSC's scanlines / a scanline generator on VGA displays
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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Thu Aug 20, 2020 10:02 pm 


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Joined: 26 Dec 2017
Posts: 129
Wow, Thanks! Yeah, the XP-37 isn't extremely dim, but a gamma boost like this would really help.

I'll look into it!


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Oct 06, 2020 3:43 pm 



Joined: 06 Oct 2020
Posts: 3
Hey, new here.
Was looking for info on a nec pg-2740 someone gave me.
At first I was getting no picture. Reflowed everything and now I get a picture but it takes over 5 minutes to get there and it's still messed up.
I'm used to working on simple arcade monitors so I'm pretty lost. Saw there was a long discussion about a similar monitor and was hoping to get some advice/help.

When I turn on my monitor it stays black for a couple minutes. The image will slowly show up starting on the left side and after a few more minutes will be done. It's shifted way to the right and is shaky. If I use the remote I can move it left but even all the way it's still not centered. Any thoughts would be appreciated.
Thanks

<blockquote class="imgur-embed-pub" lang="en" data-id="a/RMNUl6b" ><a href="//imgur.com/a/RMNUl6b">nec pg-2740</a></blockquote><script async src="//s.imgur.com/min/embed.js" charset="utf-8"></script>


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Oct 13, 2020 5:10 am 



Joined: 10 Feb 2015
Posts: 5
I have an XM29 Plus that I was tired of the loud fan noise on. I looked around and it seemed like some people had really complicated solutions for getting around the automatic shutoff when you use different fans, but fortunately I found one post on shmupsforum saying you can simply ground the sense wires on the fan cables and it will work. I tried it out and sure enough, it does! So now I have wired in some PC fan connector adapters and hooked up Noctua Redux fans instead - much quieter. Not that anybody will notice, but I think these fans blend nicely with the design. And I must say, these monitors are remarkably easy to service!
Image

I also had noticed the internal speakers sounded very bad, and when I took the case off they proved to be totally destroyed:
Image

The speakers are 90 x 55 mm, 16 Ohm, which seems pretty unusual. The closest match I can find online are 90 x 50 mm (or 3.5 x 2 inches) and fairly few of those are 16 Ohm, but maybe I could use speakers that size and just attach the screws on one side... anybody successfully replaced their speakers?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Mon Nov 02, 2020 6:40 pm 



Joined: 06 Oct 2020
Posts: 3
Im bumping this. Still looking for the nec pg-2740 service manual
Im getting no high voltage


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sat Nov 07, 2020 8:07 pm 



Joined: 02 May 2013
Posts: 222
What is the component to replace, if the monitor does not output sound?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Nov 08, 2020 8:08 am 


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Joined: 18 Sep 2010
Posts: 124
I have a small update on my monitor. A while back I took my XV29 to a video repair place here in town. It took the guy a while to get around to it, but he gave me an update the other day. He said he tested the transistors (I think he means the power transistors) and the values were slightly off from what they should be. That actually makes sense as a possible explanation for the problem, since I thought it could be related to the power supply. Anyway, he said he ordered some new transistors, so currently we’re waiting on those to arrive. I think I may have mentioned this before, but when and if the monitor is ever fully working, I plan on making a video about it - which I’ll post here.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Mon Nov 09, 2020 11:44 am 



Joined: 19 Apr 2016
Posts: 19
Does anybody have a service manual/schematics for PG-2940 or XM29+ ?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Mon Nov 09, 2020 1:16 pm 


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Joined: 18 Sep 2010
Posts: 124
guut wrote:
Does anybody have a service manual/schematics for PG-2940 or XM29+ ?


There’s a service manual for the XM29 (not the plus) on the first page of this thread. Depending on what information you’re looking for, you might find it in that manual.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Nov 11, 2020 4:56 pm 


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Joined: 26 Dec 2017
Posts: 129
I've been wanting new speakers for my NEC XP-37 too, as they've deteriorated significantly. Anyone know of a website where I can get the right ones?

I was recently able to adjust my monitor to be much brighter than before. Here are the results: https://imgur.com/a/hk2vXlS


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Thu Nov 26, 2020 10:12 am 


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Joined: 18 Sep 2010
Posts: 124
Another update on the XV29: the repair person is still working on it, but he told me that, besides the transistors, he also is having to replace a lot of capacitors. He said so far he's tested and replaced about 15-20 of them, and there are a lot more that need to be replaced. Apparently he's pretty busy, so that's partly why it's taking so long. From what he's told me, it sounds like he's being really thorough, and it totally makes sense that the problems he's already found could explain the symptoms the monitor exhibited; so I'm feeling pretty hopeful that, once he's finished with it, the monitor will be in really good shape. Having to wait for it is kind of agonizing, but at least I can play my PS5 in the meantime. :P

On a side note, I have other monitors, but I haven't really been using them lately. I used to think my other monitors were amazing, and they are - but having now used the XV29, everything else seems kind of boring by comparison. The XV29 is so awesome that even switching to something just slightly less awesome just doesn't feel very satisfying anymore. The XV29 has ruined all other monitors for me. On the plus side, the fact that I haven't used the XV29 (or other monitors very much) for such a long time means that when I finally get it back, it's going to be a mind-blowing experience.

Logan Jones wrote:
I've been wanting new speakers for my NEC XP-37 too, as they've deteriorated significantly. Anyone know of a website where I can get the right ones?

I was recently able to adjust my monitor to be much brighter than before. Here are the results: https://imgur.com/a/hk2vXlS


You're better off just using external speakers, unless space is an issue. Even then, you could mount them on the wall or something - that's what I've done. The built-in speakers in monitors like this are never very good, and if you're going to use such a high-quality monitor, you really should have some high-quality speakers to go with it.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sat Nov 28, 2020 9:02 pm 



Joined: 09 Feb 2019
Posts: 4
SpiderWaffle wrote:
xga wrote:
SpiderWaffle wrote:
Does anyone have another copy of the XM2950 Service Manual, or know the dip switch settings, pots ect? The one that can be found through the link I posted, easiest link to find on the web, is missing all of the adjustment procedures that would identify the pots ect, and access to service menu.


Did you read the front page of the service manual? It says you need the service manual supplement for the PG-2740 monitor.


Makes sense, need the PG-2740 service manual then, and/or code for service menu, (Pro/Xtra code can't be inputted on the remote, and monitor only has power button).



Did you ever get the service manual?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Mon Nov 30, 2020 1:19 pm 



Joined: 19 Apr 2016
Posts: 19
Does anyone here have a scan of the PG-2740 Supplement Manual?
I got a defect PG4 (no high voltage) and a colleague is trying to fix it, he told Me that he might need the Supplement Manual.
Already found a couple of NEC manuals (besides the XM2950 linked here in the first post), but no "Supplement" manual.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Dec 01, 2020 6:26 pm 



Joined: 07 Aug 2018
Posts: 42
I also have another question regarding the service manual for the XM-2950G. Down at the schematics are waveforms given for different points the on the board. They are labeled with W1, W2... etc.
But there is no information on where the waveforms are measured. I have no idea where they belong to. Does anybody have an idea?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Jan 03, 2021 3:16 pm 



Joined: 02 Nov 2014
Posts: 1
I've seen mentioned a few times in this thread the need for a NEC RD-335E remote control to save user presets/changes on the XM29+. The remote is nowhere to be seen on eBay, but I'll keep looking.

In the meantime I found a few LIRC codes for the remote online, including the User Preset button. While I was able to get the power on/off and volume buttons working through these codes, the user preset one documented online (and below) does nothing.

Code:
begin remote

  name  RD-335E
  bits           32
  flags SPACE_ENC
  eps            20
  aeps          200

  header       8800  4400
  one           550  1650
  zero          550   550
  ptrail        550
  repeat       8800  2200
  gap          38500
  toggle_bit      0

  frequency    38000

      begin codes

VIS_CTRL,USER_PRESET     0x0000000020DFD926
     
end codes

end remote


The XM29+ I am trying to do this on is the XM-2960G. Are there any other options or ways to save changes at all? Or has anyone with this model been able to save settings?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jan 05, 2021 11:34 am 



Joined: 05 Jan 2021
Posts: 1
Anyone have any info on the CM monitors? I just picked up a NEC CM-2591A and I can't really find any info about it online.

https://ibb.co/SJ4DRJy
https://ibb.co/D42Cf0c

Looks like there is a 34 pin connector in the back. I'm assuming this is like the Sony connector?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Jan 15, 2021 7:23 pm 



Joined: 06 Oct 2020
Posts: 3
Does anyone do repairs here?
Hoping to find someone who has a nec pg-2740 who can service mine.
Hoping to be able to send the pcbs off


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