Sure, here's a hi-res photo.kel wrote:My 3778G is partially disassembled awaiting a recap so I should be able to easily check for you although due to the fact that they are slightly different models I can't guarantee either way that what I find in mine should be the same in yours.
EDIT: Just had a quick look and none of the boards or connectors seem to match the numbers on yours. Could you take a photo of the board that you are referring to and maybe a close up of the section with the missing part so that I can see if it is anything like the one in mine?
NEC XM/XP 29/37 Pro/Xtra Thread
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Sorry but it doesn't seem like I'm going to be much help with this one. My 3778G doesn't have a board that looks anything like that one in it, must have been something they added when they designed your particular model.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
So the service manual states that Q1 is a 1202 like you said:chibishin wrote:I'm in the process of replacing the electrolytic caps on an XP37 (XP-3790) I recently picked up, and I've possibly run into a slight issue.
While working on the Chopper Reg PCB (PG319B), I noticed that the transistor in location Q1 is missing but there are definitely still leads in the through-holes. It looks like the legs were snipped because they're all pretty level and straight upright, and I know I didn't do it.
Before I go down the path of possibly replacing a part that was removed at the factory, I was hoping another XP37 owner could check theirs for me and see if they have a transistor at Q1--it's adjacent to CNB01 which connects to CN406 on the Horizontal Deflection PCB. If there's one there, could you get the value for it? I'm assuming it's a 1202 like the others on that circuit, but just in case it's not.
Or if anyone has a schematic handy, that'd be helpful, too.
However, looking at the circuit diagram it says that Q1 (and Q20 also) are NC (no connection?) so I presume that there was never a Q1 from the factory. I can see in the photo that you took that Q20 is also vacant, matching the NC marking in the circuit diagram.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Yesssss, you are a lifesaver. Thanks a bunch for the help! Any chance the manual/schematic are scanned somewhere? I've dug through google quite a bit but could only find the user manual.xga wrote:So the service manual states that Q1 is a 1202 like you said:chibishin wrote:I'm in the process of replacing the electrolytic caps on an XP37 (XP-3790) I recently picked up, and I've possibly run into a slight issue.
While working on the Chopper Reg PCB (PG319B), I noticed that the transistor in location Q1 is missing but there are definitely still leads in the through-holes. It looks like the legs were snipped because they're all pretty level and straight upright, and I know I didn't do it.
Before I go down the path of possibly replacing a part that was removed at the factory, I was hoping another XP37 owner could check theirs for me and see if they have a transistor at Q1--it's adjacent to CNB01 which connects to CN406 on the Horizontal Deflection PCB. If there's one there, could you get the value for it? I'm assuming it's a 1202 like the others on that circuit, but just in case it's not.
Or if anyone has a schematic handy, that'd be helpful, too.
<snip>
However, looking at the circuit diagram it says that Q1 (and Q20 also) are NC (no connection?) so I presume that there was never a Q1 from the factory. I can see in the photo that you took that Q20 is also vacant, matching the NC marking in the circuit diagram.
<snip>
If not, any chance you could be persuaded to scan it? I'd be willing to make it worth your while.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Quick question: are the case of the XM29 and XM37 made from plastic or are more like PVM's (I think they're metal cases)
I'm having issues at home with interferences, but it seems to only affect one of my monitors (Hantarex with plastic case), but the other one seems not affected (PVM 2730QM)
As I'm planning to get both monitors in the future, I'd like to know if the cases are prone to getting interferences or not
Thanks in advance
I'm having issues at home with interferences, but it seems to only affect one of my monitors (Hantarex with plastic case), but the other one seems not affected (PVM 2730QM)
As I'm planning to get both monitors in the future, I'd like to know if the cases are prone to getting interferences or not
Thanks in advance
Re: NEC XM/XP 29/37 Pro/Xtra Thread
viewtopic.php?p=1330946#p1330946Nodoyuna wrote:Quick question: are the case of the XM29 and XM37 made from plastic or are more like PVM's (I think they're metal cases)
I'm having issues at home with interferences, but it seems to only affect one of my monitors (Hantarex with plastic case), but the other one seems not affected (PVM 2730QM)
As I'm planning to get both monitors in the future, I'd like to know if the cases are prone to getting interferences or not
Thanks in advance
The XM/XP37 have what I'm assuming is an ABS back, but this is what is underneath. I'd say it's pretty well shielded with the exception of the PCB handling video input.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I would also be interested in a copy if you do ever make a scan of it. Although it might be different from the 3778G I'm sure that there would be some similarities shared between them. Unless by any chance you have a service manual for the 3778G lying around also, I'd definitely be willing to make it worth your while too if so.chibishin wrote:Yesssss, you are a lifesaver. Thanks a bunch for the help! Any chance the manual/schematic are scanned somewhere? I've dug through google quite a bit but could only find the user manual.xga wrote:So the service manual states that Q1 is a 1202 like you said:chibishin wrote:I'm in the process of replacing the electrolytic caps on an XP37 (XP-3790) I recently picked up, and I've possibly run into a slight issue.
While working on the Chopper Reg PCB (PG319B), I noticed that the transistor in location Q1 is missing but there are definitely still leads in the through-holes. It looks like the legs were snipped because they're all pretty level and straight upright, and I know I didn't do it.
Before I go down the path of possibly replacing a part that was removed at the factory, I was hoping another XP37 owner could check theirs for me and see if they have a transistor at Q1--it's adjacent to CNB01 which connects to CN406 on the Horizontal Deflection PCB. If there's one there, could you get the value for it? I'm assuming it's a 1202 like the others on that circuit, but just in case it's not.
Or if anyone has a schematic handy, that'd be helpful, too.
<snip>
However, looking at the circuit diagram it says that Q1 (and Q20 also) are NC (no connection?) so I presume that there was never a Q1 from the factory. I can see in the photo that you took that Q20 is also vacant, matching the NC marking in the circuit diagram.
<snip>
If not, any chance you could be persuaded to scan it? I'd be willing to make it worth your while.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
+1 PLEASEkel wrote:I would also be interested in a copy
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Hi,
Does anyone have servicemanual copy for the pg-2940G (4PG)
It stopped working and i suspect a burned transistor to lopt or somekind. Black screen however tube is nice glowing and leds on front + sound work.
Thanks
Does anyone have servicemanual copy for the pg-2940G (4PG)
It stopped working and i suspect a burned transistor to lopt or somekind. Black screen however tube is nice glowing and leds on front + sound work.
Thanks
-
- Posts: 83
- Joined: Sun Jul 30, 2017 5:05 pm
- Location: UK
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Hi all. Can someone please upload the service manual for the NEC XP29 Plus? The link in the first post doesn't appear to work anymore and I can't find it anywhere online.
I managed to pick up two of these but like most NEC's I've seen online, both have some kind of small geometry issue in one or two corners. I would really like to take a look at the service manual!
I managed to pick up two of these but like most NEC's I've seen online, both have some kind of small geometry issue in one or two corners. I would really like to take a look at the service manual!
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Wondering if anyone has a service manual for....
Just kidding.
Just kidding.
-
andykara2003
- Posts: 1338
- Joined: Sat Apr 27, 2013 3:26 pm
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Out of interest, does the XM29 produce scan lines when displaying 480p content?
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I don’t own that model but I own the mitsu..andykara2003 wrote:Out of interest, does the XM29 produce scan lines when displaying 480p content?
It displays 240p over 480p quite well with scanlines density options. *with OSSC and DAC
I would guess the same
*edit 3/20/19 added OSSC to message
Copyright 1987
-
andykara2003
- Posts: 1338
- Joined: Sat Apr 27, 2013 3:26 pm
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Cheers - although I mean scanlines when running a 480p on a console like the GameCube. Some CRTs do display small scanlines on 480p material.
-
- Posts: 1533
- Joined: Thu Mar 02, 2017 6:53 pm
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I asked this question elsewhere and never got an answer...hopefully you pros know: can these NEC monitors do 16:9 widescreen? (and I'm not talking about squeezing the image via the service menu so it's 16:9-esque, like a proper 720p widescreen mode via a button press or whatnot).
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I don't believe so for 480p content. For 480i content though, there are noticeable blank spaces between pairs of lines. This seems to be common with multisync monitors. My friend's Sony PVM 20L5 does the same thing.andykara2003 wrote:Out of interest, does the XM29 produce scan lines when displaying 480p content?
There's no dedicated button to change aspect ratios. There's a "Scan Select" button that may accommodate 16x9 resolutions better, but I'd have to test to see.Dochartaigh wrote:I asked this question elsewhere and never got an answer...hopefully you pros know: can these NEC monitors do 16:9 widescreen? (and I'm not talking about squeezing the image via the service menu so it's 16:9-esque, like a proper 720p widescreen mode via a button press or whatnot).
Last edited by aaronmjr on Thu Mar 21, 2019 7:18 pm, edited 1 time in total.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
So how do I get my XM2950 do default to overscan mode, everytime a resolutions switch I have to press the scan button to fill the screen again?
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I keep trying to remember to test this at home. I'm going to try changing the scan mode while on an input, then press "User preset" and see if it sticks next time I power the monitor on.haightc wrote:So how do I get my XM2950 do default to overscan mode, everytime a resolutions switch I have to press the scan button to fill the screen again?
-
ChuChu Flamingo
- Posts: 293
- Joined: Sun Feb 19, 2012 9:32 am
- Location: United States
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Just acquired a nec xm 29 and having a few problems.
To begin here is my full setup.
Gscart Lite
BNC to scart female with no sync stripper
Sega Saturn Csync Cable with 470ohm resistor
PS2 Scart cable sync on luma with 1000uf caps
PS1 Scart cable sync on luma with 220uf caps
Hokuto No Ken
https://youtu.be/gsiC6aJ8JvE
Notice how the screen size changes. On my Nec XM2950 I have the switch set to HIGH, not 75 ohm. If I set to 75 ohm it doesn't do this but my contrast sucks ass. Turning down the contrast on high makes it not happen but then my contrast sucks.
https://youtu.be/BaRmw1eApXg
screen takes a split second to switch from 480i to 240p etc. I tested n64 majoras mask with 240p/480i switching via menu and bombers notebook and no such drop. Pokemon stadium is the same.
Is there a setting/dip switch I am missing here? Do I need a sync stripper for my rgb even though the gscart already provides clean cysnc?
I don't mind opening it up to adjust pots since S-video could use more contrast. I could also adjust the width pot but I can't find the PG2770 service manual that details all this. All I have to go by is Spiderwaffles postings...
Thanks
To begin here is my full setup.
Gscart Lite
BNC to scart female with no sync stripper
Sega Saturn Csync Cable with 470ohm resistor
PS2 Scart cable sync on luma with 1000uf caps
PS1 Scart cable sync on luma with 220uf caps
Hokuto No Ken
https://youtu.be/gsiC6aJ8JvE
Notice how the screen size changes. On my Nec XM2950 I have the switch set to HIGH, not 75 ohm. If I set to 75 ohm it doesn't do this but my contrast sucks ass. Turning down the contrast on high makes it not happen but then my contrast sucks.
https://youtu.be/BaRmw1eApXg
screen takes a split second to switch from 480i to 240p etc. I tested n64 majoras mask with 240p/480i switching via menu and bombers notebook and no such drop. Pokemon stadium is the same.
Is there a setting/dip switch I am missing here? Do I need a sync stripper for my rgb even though the gscart already provides clean cysnc?
I don't mind opening it up to adjust pots since S-video could use more contrast. I could also adjust the width pot but I can't find the PG2770 service manual that details all this. All I have to go by is Spiderwaffles postings...
Thanks
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I have never come across a fix for that problem. The screen distorts in accordance to the voltage required to display it (so depending on the brightness). Think you got to live with that. If there's a fix I'd be interested to know too.
blog - scores - collection
Don't worry about it. You can travel from the Milky Way to Andromeda and back 1500 times before the sun explodes.
Don't worry about it. You can travel from the Milky Way to Andromeda and back 1500 times before the sun explodes.
-
FinalBaton
- Posts: 4461
- Joined: Sun Mar 08, 2015 10:38 pm
- Location: Québec City
Re: NEC XM/XP 29/37 Pro/Xtra Thread
You should not be putting the impedance to high (unless you have a source collected to the throughput).
If your contrast completely sucks, maybe there's something wrong with the monitor.
I remember that with mine, I had to spend a ton of time tweaking brightness and contrast to find the best balance between the two. but once I did it looked great.
If your contrast completely sucks, maybe there's something wrong with the monitor.
I remember that with mine, I had to spend a ton of time tweaking brightness and contrast to find the best balance between the two. but once I did it looked great.
-FM Synth & Black Metal-
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Its the flyback transformer. You can see my details of this problem and what I tried at: https://assemblergames.com/threads/nec- ... ise.48930/Rochabian wrote:Hi dear owners of those greatfull monitors
I've got an XM29 + in an arcade cab since 5 years and recently I hear a very high whistle when I play in 15khz. It does not occur on resolutions higher than 640x480. I was told that it could come from coils that would vibrate at 15khz and would be audible. I tried to touch the components with a stick to see if the noise stopped but since I do not know where these reels are, it's a bit difficult. Can someone tell me where I should look? It seems to me that the sound comes from the PCB on the right when we look at the monitor from behind. I was also told about the very high voltage module that can vibrate. What do you think ?
I have had this problem for many years. Because of this my XM29 Plus has sat in the closet for a long time. I haven't looked for a while but I have yet to see anyone perform this repair. Because this is one of the most dangerous components in the monitor I wouldn't want to attempt this without some clear instructions. The thing is too much of a hassle with the fans and screeching noises.
-
- Posts: 724
- Joined: Sat Oct 19, 2013 10:26 pm
- Location: Riverside, CA
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Tightening the screws that hold on the flyback helped one of the two of mine.
If anyone knows the part number for the flyback it'd probably do a few of us some good.
If anyone knows the part number for the flyback it'd probably do a few of us some good.
-
- Posts: 124
- Joined: Tue Oct 30, 2018 8:29 pm
Re: NEC XM/XP 29/37 Pro/Xtra Thread
What is the best way to connect ypbpr component to the xtra/plus line?
-
FinalBaton
- Posts: 4461
- Joined: Sun Mar 08, 2015 10:38 pm
- Location: Québec City
Re: NEC XM/XP 29/37 Pro/Xtra Thread
I used a Mayflash transcoder to connect a psp to mine : http://www.mayflash.com/Products/VIDEOA ... GA005.htmlCannonballs wrote:What is the best way to connect ypbpr component to the xtra/plus line?
It certainly looked good but I haven't done any captures to analyze it's performance so I couldn't tell you whether it crushes black or not.
Also am not 100% sure if it accepts 480i/240p. I think it did. But the description in the link above doesn't mention it.
It's powered by USB, which may be handy depending of your setup.
It can also be had for as low as $13.
Not saying it is the "best" but, hey... just throwing my experience out there.
Now I'm sure someone will jump in to say it's trash, haha!
EDIT : looks like it looses sync for a half-second when a picture goes from full white to full black, but this can be repaired if you open the unit : https://www.reddit.com/r/crtgaming/comm ... erter_any/
Maybe you'd be best with an Extron CVC 200 or 300, as suggested in there. Extron gear is pretty much always reference level
Also, the OSSC does this I think, but you'd need an HDMI to VGA transcoder chained to the output
Last edited by FinalBaton on Thu Aug 08, 2019 3:04 am, edited 2 times in total.
-FM Synth & Black Metal-
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Do you have a Xtra model? Both the XM-2961 and the XP-2991 Xtra models support component natively and don't require the use of a transcoder.Cannonballs wrote:What is the best way to connect ypbpr component to the xtra/plus line?
-
- Posts: 124
- Joined: Tue Oct 30, 2018 8:29 pm
Re: NEC XM/XP 29/37 Pro/Xtra Thread
It’s an xtra and it’s 37, xm3761 is the model number. Will YPbPR work through the RGB BNC input? Or do I need a YPbPR to VGA converter to put component in through the VGA input? I’ve never had a multi sync monitor or anything that does above 480i, sorry if this all sounds stupid.xga wrote:Do you have a Xtra model? Both the XM-2961 and the XP-2991 Xtra models support component natively and don't require the use of a transcoder.Cannonballs wrote:What is the best way to connect ypbpr component to the xtra/plus line?
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Both the VGA and BNC ports accept the exact same signals. Grab some BNC>RCA adapters and give it a try.Cannonballs wrote:It’s an xtra and it’s 37, xm3761 is the model number. Will YPbPR work through the RGB BNC input? Or do I need a YPbPR to VGA converter to put component in through the VGA input? I’ve never had a multi sync monitor or anything that does above 480i, sorry if this all sounds stupid.xga wrote:Do you have a Xtra model? Both the XM-2961 and the XP-2991 Xtra models support component natively and don't require the use of a transcoder.Cannonballs wrote:What is the best way to connect ypbpr component to the xtra/plus line?
EDIT: Sounds like I was wrong.
Last edited by aaronmjr on Thu Aug 08, 2019 2:46 pm, edited 1 time in total.
Re: NEC XM/XP 29/37 Pro/Xtra Thread
The XM-3761 supports RGB, YCbCr and YPbPR via the RGB 2 BNC connections only.Cannonballs wrote:It’s an xtra and it’s 37, xm3761 is the model number. Will YPbPR work through the RGB BNC input? Or do I need a YPbPR to VGA converter to put component in through the VGA input? I’ve never had a multi sync monitor or anything that does above 480i, sorry if this all sounds stupid.
If the colour of the image is incorrect, you will need to change the RGB 2 signal format from the DV controls option in the OSD menu. Best to set the signal format to AUTO if it isn't already.
-
- Posts: 2
- Joined: Fri Aug 16, 2019 1:05 am
Re: NEC XM/XP 29/37 Pro/Xtra Thread
Idk if anyone has posted this already but I need the service manual for the Nec PG2710 any help would be appreciated thanks update :// got it !!
Last edited by Archangel2878 on Tue Aug 20, 2019 4:03 am, edited 1 time in total.