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 Post subject: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 2:27 am 


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Joined: 15 Sep 2014
Posts: 166
Hey all,

Picked up this guy this past week - a NetTV DTV34x. Driving it home sure was fun - entire right view was obstructed. Just stayed in the slow lane and didn't get pulled over :)

Spoiler: show
Image


What intrigued me were the two VGA DB15 connectors labeled RGB.

Spoiler: show
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From what little information about this that I can gather is, NetTVs are also referred to as Sampo / Picturetel / Tandberg .

Spoiler: show
ImageImage


Anyone have any experience with one of these? Can this thing support 240p content? I imagine its 480i/p - 1080i? Seems like it is just a giant PC crt for classrooms back in the day.

What do ya'll think? Should I keep her?


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 3:02 am 



Joined: 04 Jun 2015
Posts: 201
What a beast!

I'm fairly certain that these models will only sync as low as 31KHz, but we won't know for sure until you try.

It seems like all the cool kids these days are getting 240P / 15KHz out of 31KHz monitors by forcing the vertical refresh to 120Hz and performing some other trickery. I haven't tried this myself, but might be worth exploring.


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 4:38 pm 


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Joined: 27 Apr 2015
Posts: 660
Location: Bellingham, WA
xga wrote:
What a beast!

I'm fairly certain that these models will only sync as low as 31KHz, but we won't know for sure until you try.

It seems like all the cool kids these days are getting 240P / 15KHz out of 31KHz monitors by forcing the vertical refresh to 120Hz and performing some other trickery. I haven't tried this myself, but might be worth exploring.


You just blew my mind xga. Can you elaborate on how to do this or at least pointing to the direction of the rabbit hole. I have a 37" megaview that is begging for this.

Also your Nettv looks dope
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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 4:54 pm 


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Joined: 30 Apr 2012
Posts: 2350
Location: Kentucky
Hoagtech wrote:
xga wrote:
What a beast!

I'm fairly certain that these models will only sync as low as 31KHz, but we won't know for sure until you try.

It seems like all the cool kids these days are getting 240P / 15KHz out of 31KHz monitors by forcing the vertical refresh to 120Hz and performing some other trickery. I haven't tried this myself, but might be worth exploring.


You just blew my mind xga. Can you elaborate on how to do this or at least pointing to the direction of the rabbit hole. I have a 37" megaview that is begging for this.

Also your Nettv looks dope


It'd have to be an emulator-only thing I'd imagine. When I had a PC CRT on my desk I was able to run the Steam version of Metal Slug 3 at 320x240@120Hz. Gave some really fat, cool-looking scanlines, but also totally disabled the monitor's controls, so I couldn't fix the weird geometry the mode gave (it was severely shifted or maybe stretched).


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 5:05 pm 


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Joined: 30 Jan 2016
Posts: 425
bobrocks95 wrote:
It'd have to be an emulator-only thing I'd imagine. When I had a PC CRT on my desk I was able to run the Steam version of Metal Slug 3 at 320x240@120Hz. Gave some really fat, cool-looking scanlines, but also totally disabled the monitor's controls, so I couldn't fix the weird geometry the mode gave (it was severely shifted or maybe stretched).

This is supported by Game Boy Interface (standard and low latency) in 119.88i, 119.652p and 119.455p variants.


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 6:17 pm 


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Joined: 15 Sep 2014
Posts: 166
Interesting info everyone! Please, do share some tests I can do!

Here is what the menus are showing me -

AV composite / S-Video 15khz (no surprise):
Spoiler: show
Image


RF on 'white noise' screen showing 15khz/50hz... is this normal? Or is this PAL only? Seems odd. Maybe I just need a history lesson, it's not like I will ever be using RF anyway:
Spoiler: show
Image


DC menu and in-game 31khz/60hz from an OEM DC-VGA box:
Spoiler: show
Image Image


I unfortunately do not have a remote control, but it seems like I can navigate pretty far from the front face buttons. I might try and find a code with a universal remote because the onscreen menu (as shown above in the DC examples) shows M:01, which makes me wonder if there is a M:02 mode or something, only toggled by a remote? Just a hunch.

From the research I have done on these sets, I found some info from other forums from user "SignOfZeta" which helps out a ton. I still haven't tried to access the secret menu, but it seems to affect the AV inputs anyway... And it appears he is confirming that the RGB lines only handle 480p+, so it looks like I have a giant PC CRT. But again I will still do more testing, I am all ears!! Here is the source, and here is the helpful post (not sure if this is 'forum ethical' to copy/paste b/w the two, but here it goes. it was from 2011):

Quote:
UPDATE:

For people anywhere on the internet that may stumble upon this info...

I managed to find a photocopied service manual for this TV on eBay. Actually, the manual is for a Sampo DTV29X, but they are really similar. I haven't really dug into it yet, but I did learn a few things:

All supported resolutions are spelled out in the manual, and it really does go no lower than 640x480 progressive on the RGB inputs.

I did learn some good things about adjusting it though, for that I'm really glad. This monitor has some barrel/pincushion/trapezoid issues and it was frustrating me that I couldn't adjust them. Well, if you are currently viewing the VGA inputs you can adjust all that stuff like with any computer monitor. The advanced geometry settings are only visible in RGB/VGA mode though. You can adjust them for the SD inputs, but for that you need to enter service mode. You do this by holding down the power button, pulling he plug, and then reinserting the plug (all with the power button still held down). The service menu will then appear where you can adjust all sorts of L337 shit.

I'm posting this now because there are a lot of these displays turning up at school auctions and stuff for even less than what I paid and its a great fucking monitor for gaming. Information is REALLY hard to find on it though. In fact, the expired craigslist ad for the very one I now own is on the first page of Google hits (I imagine this thread is pretty high up too). Anyone into classic games who stumbles across one of these monitors might really appreciate finding this info here (I certainly would have).


So far the only testing I have done is run VGA out from a gscartsw AND from the output of my BVMD20 via a bnc-to-vga cable that is confirmed to work on a PEXHDCAP60L, which I figured might not work since its just raw R,G,B,HV...


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Jun 04, 2017 6:35 pm 


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Joined: 08 Mar 2015
Posts: 3762
Location: Qu├ębec City
At least you can get 240p with S-video! not bad at all
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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Mar 08, 2020 12:47 pm 


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Posts: 151
Sorry to dig up an arcane thread, but I scored one of these the other day for free! It came with an enormous metal cabinet w/ wheels (with an old PC in it! Gotta turn the thing into an emulation PC!), and also a bunch of wacky late 90s video conference equipment. Using an OSSC with it currently, and got a used scanline generator for insanely cheap on eBay. Looking forward to comparing those to the OSSC's own scanline feature.

I also have a SECOND one that only has the composite & Svid, but there's some empty slots where the VGA ports would be. Unfortunately, I am going to have to toss the second one out soon, but if there's anyone near Massachusetts (I'm located about 20 minutes west of Boston) I would be elated to give it a good home!

EDIT: 'tis gone now, off to who-knows-where. Incredibly happy with the VGA one that I kept! OSSC 240p/480i resolution changes on Saturn/PS1 are very quick to recover, and the image adjustment options on the menu are very smooth and quick (hold the button down and the values ZOOM up and down, no incessant tapping like on my NEC PC CRT). Craigslist is pretty barren nowadays overall, but this monitor reminded me there's still gems to be found if you put in the time :)


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Mar 08, 2020 7:06 pm 


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Posts: 166
kitty666cats wrote:
Sorry to dig up an arcane thread, but I scored one of these the other day for free! It came with an enormous metal cabinet w/ wheels (with an old PC in it! Gotta turn the thing into an emulation PC!), and also a bunch of wacky late 90s video conference equipment. Using an OSSC with it currently, and got a used scanline generator for insanely cheap on eBay. Looking forward to comparing those to the OSSC's own scanline feature.

I also have a SECOND one that only has the composite & Svid, but there's some empty slots where the VGA ports would be. Unfortunately, I am going to have to toss the second one out soon, but if there's anyone near Massachusetts (I'm located about 20 minutes west of Boston) I would be elated to give it a good home!

EDIT: 'tis gone now, off to who-knows-where. Incredibly happy with the VGA one that I kept! OSSC 240p/480i resolution changes on Saturn/PS1 are very quick to recover, and the image adjustment options on the menu are very smooth and quick (hold the button down and the values ZOOM up and down, no incessant tapping like on my NEC PC CRT). Craigslist is pretty barren nowadays overall, but this monitor reminded me there's still gems to be found if you put in the time :)


Awesome! Also from the sounds of it we are very close... Always cool to see when those in the hobby are around. Small world :)

These beaut's are MASSIVE but honestly are pretty sweet. I am kind of surprised more people don't praise these as much.

I've got to ask if yours happened to come with a remote? If so please send me a model# and/or picture I would love to see if they are around. My IR Samsung S6 still acts as a sweet universal remote but I am kind of a sucker for original sh*t. :P

One day I will attempt an RGB mod on this thing. Maybe our paths will cross one day (Western Mass. here)

Cheers


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Mar 08, 2020 7:18 pm 


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Posts: 151
korpse413 wrote:
kitty666cats wrote:
Sorry to dig up an arcane thread, but I scored one of these the other day for free! It came with an enormous metal cabinet w/ wheels (with an old PC in it! Gotta turn the thing into an emulation PC!), and also a bunch of wacky late 90s video conference equipment. Using an OSSC with it currently, and got a used scanline generator for insanely cheap on eBay. Looking forward to comparing those to the OSSC's own scanline feature.

I also have a SECOND one that only has the composite & Svid, but there's some empty slots where the VGA ports would be. Unfortunately, I am going to have to toss the second one out soon, but if there's anyone near Massachusetts (I'm located about 20 minutes west of Boston) I would be elated to give it a good home!

EDIT: 'tis gone now, off to who-knows-where. Incredibly happy with the VGA one that I kept! OSSC 240p/480i resolution changes on Saturn/PS1 are very quick to recover, and the image adjustment options on the menu are very smooth and quick (hold the button down and the values ZOOM up and down, no incessant tapping like on my NEC PC CRT). Craigslist is pretty barren nowadays overall, but this monitor reminded me there's still gems to be found if you put in the time :)


Awesome! Also from the sounds of it we are very close... Always cool to see when those in the hobby are around. Small world :)

These beaut's are MASSIVE but honestly are pretty sweet. I am kind of surprised more people don't praise these as much.

I've got to ask if yours happened to come with a remote? If so please send me a model# and/or picture I would love to see if they are around. My IR Samsung S6 still acts as a sweet universal remote but I am kind of a sucker for original sh*t. :P

One day I will attempt an RGB mod on this thing. Maybe our paths will cross one day (Western Mass. here)

Cheers


I have a remote that does everything but access the menu for the screen adjustments on RGB/VGA mode... I have to dig through this nasty box, the official remote may be in there too. I'll have to snap some pics of all the silly conference room tech that came with it, it's all very very dirty. The fucking keyboard is shaped exactly like a Sega Genesis controller, lol. I will let you know if I dig out a better remote that 'does it all'!

Western Massachusetts is beautiful! The fact that we both got these and live in the same state leads me to believe that, perhaps, some salesman may have convinced a bunch of offices/schools up our way to use these... or it's just a funny coincidence :p

Also, the reason they don't get much praise is probably because they go by so damn many different names! Sampo is the original manufacturer, they made all sorts of monitors (arcade stuff, industrial stuff). My monitor's model number is SME-23DL3(A). Here's a spec sheet: https://www.manualslib.com/manual/31593 ... 23dl3.html

I'm sure our paths will cross eventually! My friend and I are setting up an arcade/console night soonish at this bar near his house, he maintains all the arcade cabs there. Unfortunately, it's in Canton which is QUITE far from you :( I posted in the meetups subforum last time we had one, and will be sure to do the same next time :)

EDIT:

https://boston.craigslist.org/sob/zip/d ... 10001.html

Here's a picture of the Craigslist post where I found them. Those wheely-cabs are fucking monsters, I assumed they'd be hard plastic but they were metal and had a thick layer of cast iron built into the base. Very fun lifting those into my uncle's pickup truck this morning to take them away to get disposed of *barfs*


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Sun Mar 15, 2020 3:04 am 


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Update: Also that old forum post from elsewhere was wrong about resolutions, I have a PS4 hooked up right now (Portta HDMI to VGA, I doubt a Tendak would work since those dumb things don't have external power) set to 720p. I believe the monitor is 1024x768 :)


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Fri Mar 20, 2020 1:33 am 


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I think mine may have died already... absolutely heartbroken right now. Hopefully I can find someone to help me move it, and then take it into another room with the space to open it up and inspect. I was so excited to use this VGA RaspPi image I was working on, having more fun using PS4 on it via the Portta HDMI to VGA, all sorts of things! And now I'm just sitting there with it staring at me across my bedroom, breaking my heart :(


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Fri Mar 20, 2020 3:04 am 


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what happened? was it a funky signal from the rasp pi or something?


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Fri Mar 20, 2020 6:14 am 


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korpse413 wrote:
what happened? was it a funky signal from the rasp pi or something?


I don't believe so, it would simply not display in a standby mode/would show a scrambled image and "out of range" indicator if it encountered a funky signal. I think it was just because this thing was stored in a dirty cold garage for 15 years and used for god-knows-what beforehand. I've found a service manual online, and it seems to either be the standby circuit or the KA3842A chip. I think I can fix it, I'm not gonna be deterred! I need to play more gorgeous CRT Dark Souls :)


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Wed Mar 25, 2020 2:23 am 


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@korpse413 An unlikely miracle has occurred! It turns out the monitor itself wasn't borked, but actually the power strip it was plugged into!

I let the thing chill for a couple days and got it to power on, only to have it turn back off. After making sure it was FULLY off, I unplugged it fro the power strip and noticed the strip was making funky noises that sounded just like the monitor was. I put two and two together, and plugged the monitor directly into the wall socket... BINGO! Got 'er turned on and working just fine, happily displaying PS4 via a Portta HDMI to VGA!

BTW, someone on Reddit just scored one recently:

https://www.reddit.com/r/crtgaming/comm ... s_to_come/

This makes FOUR different brand names I've seen these under. It's interesting that yours isn't a PictureTel, as that company was/is(?) based out of Massachusetts. But when it comes down to it, they are all Sampo monitors with Toshiba tubes.

The Reddit guy didn't nab one of the models with YPbPr, unfortunately. I would kill to have one of those! Unfortunately the YPbPr is only 15kHz, but it supports 240p just like the composite and s-video. If mine had component, I wouldn't particularly need to hold onto the 32" WEGA I have sitting right next to it. My poor, poor dresser... got 2 bigbois on top of it. At least I don't have 2 XBRs on it! xD


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Wed Mar 25, 2020 7:12 am 


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Location: San Jose, CA
I had one of these, they are great. You can inject 15khz trivially into the jungle chip, as there's an unused RGB input just hanging out.

Details here:

http://mikejmoffitt.com/articles/0051-nettv-rgb.html
Image
Image


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 Post subject: Re: NetTV DTV34x monitor
PostPosted: Wed Mar 25, 2020 7:43 am 


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mikejmoffitt wrote:
I had one of these, they are great. You can inject 15khz trivially into the jungle chip, as there's an unused RGB input just hanging out.

Details here:

http://mikejmoffitt.com/articles/0051-nettv-rgb.html
Image
Image


Very awesome! At the moment I'm plenty happy using an OSSC (and after I get to work on it, a modded GBS8200 w/ my Mini-SLG), but this looks like an awesome project I ought to undertake one of these days. Thanks for the link, I'll bookmark the hell outta this. Why did you eventually get rid of it? Too massive? Heh


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