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 Post subject: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jul 25, 2017 7:22 am 



Joined: 22 Jan 2017
Posts: 19
Starting this thread to compile and share information, resources and experiences with these NEC monitors. Hope to have it serve as a troubleshooting guide, Q and A, and more for NEC owners. I'll make some edits to this first post. I had the pleasure (torture?) of servicing 8 of these, 7 XP29 Pros, 1 XM29 Xtra, I'll invite the 7 other people whom I sold to here.

User Manuals:
29 Pros: https://www.manualslib.com/manual/10979 ... -Plus.html
29 Xtras: https://www.manualslib.com/manual/25900 ... -Xtra.html

37 Pros: https://www.manualslib.com/manual/10986 ... oduct-XP37
37 Xtras: https://www.manualslib.com/manual/25900 ... -MultiSync

Service Manuals:
XM29: http://blog.wolfsoft.de/wp-content/uplo ... SM_NEC.pdf (missing best parts!!)
29 Pros: https://mega.nz/#!4MV11K6B!sdn38KbL-NUB ... oRMfUVhNTw


Last edited by SpiderWaffle on Sun Aug 20, 2017 6:31 pm, edited 2 times in total.

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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jul 25, 2017 11:02 am 


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Joined: 08 Mar 2015
Posts: 2886
Location: Québec City
Good idea.
I'll post a pic/link later of the adapter I successfully use on the MAC15 port of those monitors.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jul 25, 2017 3:15 pm 



Joined: 14 Mar 2011
Posts: 90
Location: Sacramento, CA
I have a completely disassembled XM29+ in my shed (been there for at least a year) that I have been unable to repair even with the full schematics. The power supply PCB works but HV section never comes up. The PWM that drives the flyback starts for a few milliseconds then dies. Anyone run into a similar issue?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jul 25, 2017 3:50 pm 



Joined: 25 Jul 2008
Posts: 989
Location: Leeds
Fusion916 wrote:
I have a completely disassembled XM29+ in my shed (been there for at least a year) that I have been unable to repair even with the full schematics. The power supply PCB works but HV section never comes up. The PWM that drives the flyback starts for a few milliseconds then dies. Anyone run into a similar issue?


... Presume nothing to do with the fans? These work fine? Monitor will shut down if these aren't working ... iirc you can daisy chain one if you only have one working... There's a thread somewhere where someone managed to not only daisy chain his fans to the quietest one but also start up and then slow down the fans to reduce noise... I don't think he could find a replacement for them though...

Here it is:

http://www.silentpcreview.com/forums/vi ... hp?t=56769


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Tue Jul 25, 2017 5:47 pm 



Joined: 14 Mar 2011
Posts: 90
Location: Sacramento, CA
gray117 wrote:
Fusion916 wrote:
I have a completely disassembled XM29+ in my shed (been there for at least a year) that I have been unable to repair even with the full schematics. The power supply PCB works but HV section never comes up. The PWM that drives the flyback starts for a few milliseconds then dies. Anyone run into a similar issue?


... Presume nothing to do with the fans? These work fine? Monitor will shut down if these aren't working ... iirc you can daisy chain one if you only have one working... There's a thread somewhere where someone managed to not only daisy chain his fans to the quietest one but also start up and then slow down the fans to reduce noise... I don't think he could find a replacement for them though...

Here it is:

http://www.silentpcreview.com/forums/vi ... hp?t=56769


All fans were hooked up and working last time I messed with it.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Jul 26, 2017 6:31 am 


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Joined: 31 Mar 2015
Posts: 170
Location: Netherlands
Nice thread, will follow this :)

Note; the first link for the XM29 manual is actually the service manual


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Jul 28, 2017 2:34 am 



Joined: 26 Feb 2010
Posts: 383
Hello,

I thought I'd post this capacitor key that I created for the XP29+ deflection board. This is the back of the board which has each component numbered on the silk screen. All the capacitors are highlighted, but only the electrolytics are circled in red and listed.

Please Note: None of the capacitors on my NEC's deflection board needed to be replaced. They were all high-quality, 105° C Nichicons. This may just be because my NEC had low use or it could be that these caps don't fail as often as caps in other monitors like the Sony BVM series.

My NEC has some geometry issues that other owners on the internet have noted. It isn't that bad, but its something I'm trying to improve. It may not be failing components at all though – it may just be the way this monitor is. I've probably been spoiled by Sony BVMs. :P

That said, I'll be taking a look at the Video board next, there are a lot of surface mount caps on there.... :)

XP 29+ DEFLECTION BOARD
Spoiler: show
Image


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Jul 28, 2017 3:05 am 



Joined: 30 Dec 2014
Posts: 462
On the 37 inch models has anyone successfully done a fan replacement mod? Seems like it would be a pretty easy, low risk thing to do but I usually don't like opening up crt's. Other thing that is annoying with mine is a very high pitched whistle that comes and goes. A simple cap replacement would probably fix this but again i dont like messing with the insides of crt's.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Jul 28, 2017 3:40 am 



Joined: 26 Feb 2010
Posts: 383
tacoguy64 wrote:
Other thing that is annoying with mine is a very high pitched whistle that comes and goes. A simple cap replacement would probably fix this but again i dont like messing with the insides of crt's.


I don't think that whistle is due to bad caps. You may want to take it to someone to be serviced if it becomes more frequent.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Jul 28, 2017 7:02 pm 


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Joined: 08 Mar 2015
Posts: 2886
Location: Québec City
Here is the adapter I use on the MAC15 port of my NEC (thought this might ne useful to other owners who want to make use of that port) :

http://www.ebay.ca/itm/HD15-VGA-Monitor ... SwFNZWznc-
Image

This is a nice purchase since it gives you 4 RGB inputs on the monitor! (remember : the NEC's ports can act as either input or passthrough. as long as you don't have t2o console turned on and plugged in both port of input 1(or input 2), this is safe to use).

This also gives you a passthrough function on input 1!


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Aug 20, 2017 6:34 pm 



Joined: 22 Jan 2017
Posts: 19
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.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Mon Aug 21, 2017 11:37 am 



Joined: 04 Jun 2015
Posts: 158
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.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Aug 23, 2017 3:13 am 



Joined: 22 Jan 2017
Posts: 19
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).


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Aug 23, 2017 9:08 pm 


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Joined: 27 Apr 2013
Posts: 1065
Spiderwaffle - where abouts are you based? I'd love to have someone do a general service on my NEC XV29 plus but I'm in the UK.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Aug 23, 2017 9:17 pm 



Joined: 22 Jan 2017
Posts: 19
andykara2003 wrote:
Spiderwaffle - where abouts are you based? I'd love to have someone do a general service on my NEC XV29 plus but I'm in the UK.


I'm in US, SoCal


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Wed Aug 23, 2017 9:29 pm 


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Joined: 27 Apr 2013
Posts: 1065
Damnit! :) Thought I should mention there is the "XV" series of these monitors - they only have one input. You can input 31Khz or 15Khz via the HD-15 socket. I use a transcoder for component and a sync strike for 15Khz. The great thing about this variant is that there are no fans, so it's silent!


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Fri Sep 08, 2017 1:45 pm 


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Joined: 08 Dec 2014
Posts: 60
Location: MN
Great idea for a thread. I believe I have a manual supplement at home I can share.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sat Sep 09, 2017 3:49 pm 



Joined: 04 Jun 2015
Posts: 158
aaronmjr wrote:
I believe I have a manual supplement at home I can share.


That would be great if you could share the manual supplement, aaronmjr! I've looked high and low and never been able to find one before.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sat Sep 09, 2017 10:48 pm 


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Joined: 08 Dec 2014
Posts: 60
Location: MN
I actually have the physical copy. Wonder if a copy place could scan and make me a PDF..

Image


Last edited by aaronmjr on Fri Nov 24, 2017 11:16 pm, edited 1 time in total.

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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 10:47 am 


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Joined: 27 Apr 2013
Posts: 1065
My XV29+ doesn't have quite as much width amplitude control as I'd like. With the width set at max, GameCube games are only just wide enough to fit the screen and the Dreamcast underscans. Does anyone know how I can get a touch more width control out of the monitor?


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 1:30 pm 


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Joined: 08 Dec 2014
Posts: 60
Location: MN
My XM29 is the same way with Dreamcast. I don't think there's much you can do unfortunately.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 2:22 pm 


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Joined: 08 Mar 2015
Posts: 2886
Location: Québec City
andykara2003 wrote:
My XV29+ doesn't have quite as much width amplitude control as I'd like. With the width set at max, GameCube games are only just wide enough to fit the screen and the Dreamcast underscans. Does anyone know how I can get a touch more width control out of the monitor?

Dreamcast fills the whole screen on mine! And there's still a bit of room left on both HSIZE and VSIZE.

Maybe that input is set to Underscan? (yes, there indeed is an underscan/overscan function on these sets(at least mine) that is not accessible through the On Screen Menu. But rather only from the remote).


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 4:04 pm 


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Joined: 27 Apr 2013
Posts: 1065
Thank you! I wasn't thinking clearly - it was sent to underscan, DC fills the screen now. Playing Sturmwind - the game looks incredible on these monitors :D


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 4:48 pm 


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Location: Québec City
Yes Dreamcast looks awwwwwwesome on these monitors :P

I feel like 480p is their strong point(they handle 240p iamazingly as well, don't get me wrong), with the stripe pitch they have (not too high, not too low) and the great colours and contrast. no scanlines at 480p(compared to fine pitch aperture grills), just a full, solid picture


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 6:29 pm 


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Joined: 08 Dec 2014
Posts: 60
Location: MN
andykara2003 wrote:
Thank you! I wasn't thinking clearly - it was sent to underscan, DC fills the screen now. Playing Sturmwind - the game looks incredible on these monitors :D


Interesting. I have mine set correctly but this is as close as I can get. Dreamcast using a TORO VGA Box into an Extron Crosspoint and then into RGB2 via BNC. It does exactly the same thing when plugged directly into RGB1 (VGA).

Image
Image
Image


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 9:04 pm 


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Posts: 1065
I have that little sliver as well - I'm not too bothered as it's pretty unnoticeable.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 9:45 pm 


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Posts: 2886
Location: Québec City
that little sliver is always gonna be there : it's the end of the active viewing area. you can't fill that with graphics


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 9:49 pm 


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Joined: 08 Dec 2014
Posts: 60
Location: MN
Ah okay. I wasn't worried about it until it sounded like mine wasn't the same as yours. Thanks for clarifying.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 10:14 pm 


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Location: Kentucky
I'd guess that's a side effect of the Dreamcast having a 640 pixel wide image embedded in a 720 pixel wide frame. Would make for plenty of overscan on true 720 pixels wide material, but it ends up just a hair squished for the 640 active pixels.


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 Post subject: Re: NEC XM/XP 29/37 Pro/Xtra Thread
PostPosted: Sun Sep 10, 2017 11:14 pm 


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Joined: 27 Apr 2015
Posts: 476
Location: Bellingham, WA
I was stuck on the horizontal Width issue on my Mitsubishi XC3725C from a similar era as the xm29.

I was able to fix this issue because XGA from shmups hit me up and showed me the service manual where "service switch" was located.

I was finally able to adjust the margins to true full screen by adjusting the SUB width. Does anyone have a service manual for the xm29? I would be happy to check for you guys.

Here's my switch location. It was bitch (16 screws)

Image
Image
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