GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

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Frosal
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GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Frosal »

Hi all, I'm having trouble getting this monitor to work with some consoles. At 720p@60Hz, the monitor shuts off after a while. At 1080p@60Hz the monitor will not work at all (but it does work after using Custom Resolution Utility on Windows).

PS3 at 720p@60Hz works, Xbox 360 at 720p@60Hz works for a while and shuts off (1680x1050 via the 360 VGA cable works just fine), Wii U will not work at all at 720p, VitaTV will not work at all at either 480p or 720p... I can't test 1080p with consoles yet as I'm using HDFury2 and am missing the power supply, but from what I've read this is a common problem with this monitor.

Now, HDFury2 user manual states that you can:
Yes. The HDfury2 EDID may be reprogrammed to remove support for certain resolutions if required. This is an feature reserved for advanced technical users.
I wonder if I can use Powerstrip (an old program) to make the HDFury2 use CRT timings (probably not)?

If not, does anyone know of any devices that can rectify this problem? I know of Corio C2-2355a, but can't find one for sale for a decent price. Also I would prefer not to use a scaler as it would introduce lag... Does anyone have this monitor and what do you use?
M3Patterns
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by M3Patterns »

Hello!

I have the W900 as well and have the same issues. I'm using the original HDFury.

It's actually good to hear that the PS3 is working for you in 720p, as it does not work for me at all at 720p, and that is something that I've been hoping a recap would fix.

I also just run the 360 at 1680x1050.

It's so odd, because it's not a bandwidth issue. It wil display up to 1920x1200 at 76hz, so it's rocking at least 262.7 megahertz of total video bandwidth.

My guess is that the monitor is trying to default to one of its 9 preset modes, 4 of which are Sony specialized modes that appear to predate current HDTV standards. One of the Sony modes is close to 1080p, but not quite. That mode is 1920x1080 at 60hz, with a horizontal refresh of 67.5khz. The monitor may be getting confused by the 1080p standard of 59.94hz (with a horizontal refresh of 67.7khz) since it's so close to that preset.

(I find it interesting that one of those 9 preset modes is actually listed as HDTV, but it is the obsolete and Japan only MUSE Hi-Vision 1035i standard.)

I'm guessing that if there was a way to disable those preset modes, it would sync to 1080p, but I don't know how feasible that would be.

However, that theory doesn't account for why 720p is so finicky as well, as there is not a preset that is close to that resolution.

So, I would also love to hear if anyone else has a lag-free solution.
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BazookaBen
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by BazookaBen »

I've always wondered if changing the timings in the EDID would actually change anything at the console side, but I've never tried it.

If you want to give it a shot, you can try this new software from ToastyX: https://www.monitortests.com/forum/Thre ... yID-Writer

Powerstrip is really ancient and I don't know if it would even work with modern GPUs.

You can probably export BIN files from CRU to use with the EDID writer.
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Fudoh
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Fudoh »

I've always wondered if changing the timings in the EDID would actually change anything at the console side, but I've never tried it.
it only determines which resolutions are offered by the console at all. It certainly does not alter the actual timings in any way.
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orange808
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by orange808 »

@Fudoh

Any ideas on a video processor for the job?

Crystalio II is the only machine I know of with reasonably low latency, 4:4:4, HDMI in, analog out, and frame lock--but that would cost OP a small fortune. :-(

Edit: I wonder. Did that warp processor you tried out (we spotted it at a good price a long time ago) have analog out?
We apologise for the inconvenience
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Fudoh
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Fudoh »

CII didn't have a frame lock.

But do we really need a processor with an analogue output? I think the majority of cheap D/A converters would conserve the original input timing, since any alteration would require an additional buffer in the first place.

The Extron 301 would allow a 1:1 mapping of the input onto any output resolution and offer a frame lock on top. Probably the cheapest way to try it. 1920x1200 output resolution should be supported on the output (though I only ever had it running at 1080p).
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Gunstar
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Gunstar »

Sorry to hijack this thread!

@Fudoh - Is the Extron 301 HD the best device to use to get 1080p from HDMI consoles to appear correctly on a PC CRT? On my Lacie IV (max res 1920x1440), 1080p would often not sync or if it did it would show an image with the sides cut off, with the monitor's OSD option not able to squeeze it in
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Fudoh
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Fudoh »

Probably not the best, but it's a cheap one and it does what's required (e.g. being able to transport a signal from the input to the output without any video degradation). The downside (but that's general problem) is that you're limited to what's possible within the single link DVI/HDMI specs, so you can't max out what your CRT might otherwise be able to do in terms of resolution and you won't be able to refresh rates higher than 60Hz.

But to get a regular full HD signal into a more compatible signal format (in terms of timings), it seems like a reasonable choice.
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Gunstar
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Gunstar »

Appreciate the info, Fudoh
Ryeno
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Ryeno »

Gunstar wrote:Sorry to hijack this thread!

@Fudoh - Is the Extron 301 HD the best device to use to get 1080p from HDMI consoles to appear correctly on a PC CRT? On my Lacie IV (max res 1920x1440), 1080p would often not sync or if it did it would show an image with the sides cut off, with the monitor's OSD option not able to squeeze it in
Isn't the 301 HD only HDMI output? Are you using an HDMI to VGA adapter?

The DVS 605 appears to have native VGA output.
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Gunstar
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Gunstar »

Ryeno wrote:
Gunstar wrote:Sorry to hijack this thread!

@Fudoh - Is the Extron 301 HD the best device to use to get 1080p from HDMI consoles to appear correctly on a PC CRT? On my Lacie IV (max res 1920x1440), 1080p would often not sync or if it did it would show an image with the sides cut off, with the monitor's OSD option not able to squeeze it in
Isn't the 301 HD only HDMI output? Are you using an HDMI to VGA adapter?

The DVS 605 appears to have native VGA output.
I would be using a DAC adapter when I get my hands on one, yes. Thank you for pointing out the DVS 605, looks like it's more expensive than the 301 HD. Do you know if it has the same amount of lag as the 301? I believe 301 has 1 frame of lag although I'm not sure if that's the same if you're just 'formatting' 1080p60 into a signal/'container' PC CRTs likes
Frosal
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Frosal »

M3Patterns wrote:It's actually good to hear that the PS3 is working for you in 720p, as it does not work for me at all at 720p, and that is something that I've been hoping a recap would fix.
Yeah, it's not a capacitor issue, I have found at least 3 other people on Reddit having this same problem.

PS3 works at 720p, but for some reason I had to recenter the image and the image has different (and quite terrible) geometry I didn't bother to fix when compared with the 360.

I forgot to mention, the 360 worked for a time @720p (when I first got the monitor) and then it would just start flashing redder and redder until it flashed white sporadically and went into standby. Very, very strange. I think I still have the video around here somewhere. When I changed the resolution to 1080p it went into standby immediately.

(The monitor and the tube are almost brand new by the way. It was used by a photographer and put aside and not used for like 17+ years.)
I also just run the 360 at 1680x1050.
Any downsides to this (after all, this is a 16:10 monitor)? To be honest, the 720p resolution is not all that very appealing on the W900 IMO. 1680x1050, 1920x1080 and 1920x1200 look miles better. But I don't think the 360 is rendering at 1680x1050?
My guess is that the monitor is trying to default to one of its 9 preset modes, 4 of which are Sony specialized modes that appear to predate current HDTV standards. One of the Sony modes is close to 1080p, but not quite. That mode is 1920x1080 at 60hz, with a horizontal refresh of 67.5khz. The monitor may be getting confused by the 1080p standard of 59.94hz (with a horizontal refresh of 67.7khz) since it's so close to that preset.
Yeah, that resolution works with 67.2xxx kHz.
(I find it interesting that one of those 9 preset modes is actually listed as HDTV, but it is the obsolete and Japan only MUSE Hi-Vision 1035i standard.)

I'm guessing that if there was a way to disable those preset modes, it would sync to 1080p, but I don't know how feasible that would be.
There's a service port in the back that uses cable "1-690-391-21" and you can supposedly use a DOS program to configure it. Someone posted about it on Reddit 3 years ago, but nothing ever came of it. There is much less documentation on this monitor than the FW900. I have asked in FW900 thread on Hard Forums and nothing.

I saw someone on Reddit say they use an HD Fury 3D on a post about this monitor and a Switch game, but they never answered me. Gonna see If I can contact them again.

P.S. Does anyone know what video timings the different consoles use?? Why does the PS3 specifically work and not the other consoles?
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Ryeno »

Gunstar wrote:
I would be using a DAC adapter when I get my hands on one, yes. Thank you for pointing out the DVS 605, looks like it's more expensive than the 301 HD. Do you know if it has the same amount of lag as the 301? I believe 301 has 1 frame of lag although I'm not sure if that's the same if you're just 'formatting' 1080p60 into a signal/'container' PC CRTs likes
I don't know. I have a CPD-G520 and I have a different issue. In 1080p from PS3 or Wii U, I get this weird distortion on the left side of the screen. I was thinking the centering shift of these scalers could maybe fix my issue.

https://imgur.com/EAahUcv
https://imgur.com/EtoZfit
Frosal wrote:
M3Patterns wrote:It's actually good to hear that the PS3 is working for you in 720p, as it does not work for me at all at 720p, and that is something that I've been hoping a recap would fix.
Yeah, it's not a capacitor issue, I have found at least 3 other people on Reddit having this same problem.

PS3 works at 720p, but for some reason I had to recenter the image and the image has different (and quite terrible) geometry I didn't bother to fix when compared with the 360.

I forgot to mention, the 360 worked for a time @720p (when I first got the monitor) and then it would just start flashing redder and redder until it flashed white sporadically and went into standby. Very, very strange. I think I still have the video around here somewhere. When I changed the resolution to 1080p it went into standby immediately.

(The monitor and the tube are almost brand new by the way. It was used by a photographer and put aside and not used for like 17+ years.)
I also just run the 360 at 1680x1050.
Any downsides to this (after all, this is a 16:10 monitor)? To be honest, the 720p resolution is not all that very appealing on the W900 IMO. 1680x1050, 1920x1080 and 1920x1200 look miles better. But I don't think the 360 is rendering at 1680x1050?
My guess is that the monitor is trying to default to one of its 9 preset modes, 4 of which are Sony specialized modes that appear to predate current HDTV standards. One of the Sony modes is close to 1080p, but not quite. That mode is 1920x1080 at 60hz, with a horizontal refresh of 67.5khz. The monitor may be getting confused by the 1080p standard of 59.94hz (with a horizontal refresh of 67.7khz) since it's so close to that preset.
Yeah, that resolution works with 67.2xxx kHz.
(I find it interesting that one of those 9 preset modes is actually listed as HDTV, but it is the obsolete and Japan only MUSE Hi-Vision 1035i standard.)

I'm guessing that if there was a way to disable those preset modes, it would sync to 1080p, but I don't know how feasible that would be.
There's a service port in the back that uses cable "1-690-391-21" and you can supposedly use a DOS program to configure it. Someone posted about it on Reddit 3 years ago, but nothing ever came of it. There is much less documentation on this monitor than the FW900. I have asked in FW900 thread on Hard Forums and nothing.

I saw someone on Reddit say they use an HD Fury 3D on a post about this monitor and a Switch game, but they never answered me. Gonna see If I can contact them again.

P.S. Does anyone know what video timings the different consoles use?? Why does the PS3 specifically work and not the other consoles?
Xbox 360 renders at different resolutions depending on the game and sometimes will even render a low resolution depending on the selected resolution. e.g. NFS:MW will only render at 480p even if you select 1280x1024. In general you should select a 16:9 or 16:10 resolution unless you know the game can render at something else.

You can use WinDAS to calibrate the monitor. There is a gaint thread on a different forum.
https://hardforum.com/threads/windas-wh ... s.1830788/

The program is tricky to use and there are some pitfalls. If do decide to use it, backup the factory firmwire first. I also don't recommend using the [*]weird[/*] Max, Mid, and Min resolutions in WINDAS to do calibrations because they could damage the monitor. Use standard resolutions that are close to the weird resolutions and it'll work fine.
strayan
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by strayan »

Frosal wrote: P.S. Does anyone know what video timings the different consoles use?? Why does the PS3 specifically work and not the other consoles?
I really wish someone around here had an HDMI protocol analyzer.
Frosal
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Frosal »

Ryeno wrote:You can use WinDAS to calibrate the monitor. There is a gaint thread on a different forum.
https://hardforum.com/threads/windas-wh ... s.1830788/

The program is tricky to use and there are some pitfalls. If do decide to use it, backup the factory firmwire first. I also don't recommend using the [*]weird[/*] Max, Mid, and Min resolutions in WINDAS to do calibrations because they could damage the monitor. Use standard resolutions that are close to the weird resolutions and it'll work fine.
I'm not sure if WinDAS can be used with the W900 specifically. I found some Sony service bulletins and they say you're supposed to use DAS, the precursor to WinDAS.

Either specifically "DAS Ver. JA1.0.1" or "DAS Ver. J4.5.2"... See: https://usermanual.wiki/Document/DASDig ... 813761.pdf (it seems you can use a certain DAS version with the FW900 as well).

But even if I knew where to find these programs, I'm still stuck on the esoteric cable used (see: https://old.reddit.com/r/crtgaming/comm ... t_voltage/)

I don't think the FW900 has problems with these 2 resolutions at all...

I compared the preset mode timings of both W900 and FW900:

W900 - 1920x1080@60Hz - 67.5 kHz (conforming perfectly to the "Automatic LCD Standard" and "Automatic LCD Native" - the "LCD Reduced" timing is 66.663 kHz)
1920x1080@60Hz that works on the W900 after using CRU and "Automatic CRT standard" - 67.201 kHz
FW900 - 1920x1080@60Hz - 67.080 kHz (this conforms perfectly to the "Automatic Old Standard" option by CRU)
Ryeno
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Ryeno »

Frosal wrote:
Ryeno wrote:You can use WinDAS to calibrate the monitor. There is a gaint thread on a different forum.
https://hardforum.com/threads/windas-wh ... s.1830788/

The program is tricky to use and there are some pitfalls. If do decide to use it, backup the factory firmwire first. I also don't recommend using the [*]weird[/*] Max, Mid, and Min resolutions in WINDAS to do calibrations because they could damage the monitor. Use standard resolutions that are close to the weird resolutions and it'll work fine.
I'm not sure if WinDAS can be used with the W900 specifically. I found some Sony service bulletins and they say you're supposed to use DAS, the precursor to WinDAS.

Either specifically "DAS Ver. JA1.0.1" or "DAS Ver. J4.5.2"... See: https://usermanual.wiki/Document/DASDig ... 813761.pdf (it seems you can use a certain DAS version with the FW900 as well).

But even if I knew where to find these programs, I'm still stuck on the esoteric cable used (see: https://old.reddit.com/r/crtgaming/comm ... t_voltage/)

I don't think the FW900 has problems with these 2 resolutions at all...

I compared the preset mode timings of both W900 and FW900:

W900 - 1920x1080@60Hz - 67.5 kHz (conforming perfectly to the "Automatic LCD Standard" and "Automatic LCD Native" - the "LCD Reduced" timing is 66.663 kHz)
1920x1080@60Hz that works on the W900 after using CRU and "Automatic CRT standard" - 67.201 kHz
FW900 - 1920x1080@60Hz - 67.080 kHz (this conforms perfectly to the "Automatic Old Standard" option by CRU)
IBM AT = Standard PC = 9 pin D-Sub = Serial Port.

So you just need to convert the mini din to serial port. If you can find a complete service manual then the pinout should be in the schematic. Else you could open the case and reverse engineer the pinout.
M3Patterns
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by M3Patterns »

Frosal wrote: Yeah, it's not a capacitor issue, I have found at least 3 other people on Reddit having this same problem.

...

I forgot to mention, the 360 worked for a time @720p (when I first got the monitor) and then it would just start flashing redder and redder until it flashed white sporadically and went into standby. Very, very strange. I think I still have the video around here somewhere. When I changed the resolution to 1080p it went into standby immediately.
The redder and redder - white - standby issue almost always happens when I feed it anything that's 720p. Very occasionally it will stay, but the image has odd artifacts and is virtually unusable. 1080i basically does the same thing for me as well (it is sometimes a little more stable, but still virtually unusable.)

Since 720p isn't working at all on the PS3 for me, I still think that caps are contributing at least somewhat for my issues. I also tried a bunch of resolutions on the monitor today, and I am getting some preset modes that are near the edge of the max scan range / refresh rates not wanting to sync. 1920x1200@76hz wasn't working at all, and 1600x1200@75hz gave an out of range error.
Frosal wrote:Any downsides to this (after all, this is a 16:10 monitor)? To be honest, the 720p resolution is not all that very appealing on the W900 IMO. 1680x1050, 1920x1080 and 1920x1200 look miles better. But I don't think the 360 is rendering at 1680x1050?
From what I've read, the Xbox 360 is doing hardware scaling so it should be rendering at the full 1680x1050. Scaling was one of the advantages that it had over the PS3, which apparently had a poorer hardware scaler (720p games always show at 720p, not at 1080p, etc.)

In terms of resolution differences, even though 1680x1050 is about 85% of the resolution of 1920x1080, it is showing that resolution on an area that is 11% bigger. On top of that, the general consensus from back in the day was that the max resolution of a CRT monitor was not what you would actually want to run the display on, with the manufacturer recommended resolution usually the next resolution down. (At some point you hit a wall, where a black and white linepair will just barely show up as more than a gray blur.) While this monitor doesn't list a recommended resolution, it should have a sharper (more contrast / higher MTF) image at 1680 than it does at 1920, with likely less of a pure resolution drop than what you would get on a fixed pixel display. On top of that, I doubt most 360 games actually were giving a full 1920x1080 amount of resolution. All in all, it's probably a wash.
Frosal wrote:Yeah, that resolution works with 67.2xxx kHz.
I tested several different resolutions today, just to see if any additional info could be obtained. I have the piLagTesterPRO, which, in additional to testing lag, also has the option to run at just about whatever resolution you want. There are built-in resolutions that caused the same issues, but the custom resolutions did sync. Here's what I got:

1920x1080 60p - synced at 67.2 kHz / 60 Hz - (piLag showed 59.96 Hz)
1920x1080 59.94p - synced at 67.1 kHz / 60 Hz - (piLag showed 59.87 Hz)
1920x1080 60i - synced at 33.8 kHZ / 60 Hz - (piLag showed 59.99 Hz)
1920x1080 59.94i - synced at 33.7 kHz / 60 Hz - (piLag showed 59.81 Hz)
1280x720 60p / 59.94p - synced at 44.8 kHz / 60 Hz - (piLag showed 59.85 Hz) [for this one, I believe I got the same results regardless of inputting 60p or 59.94p]

Everything was tested through the HDFury. This doesn't give me any additional clues, but it might be helpful?
Frosal
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Frosal »

I found someone on Kijiji selling this monitor and noticed they have a Switch running on it. Lo and behold, they told me they're using the Extron with it. So that's six people I found so far having the exact same problem. And he mentioned he never even figured out how to get 720p running, but just upscaled everything to 1080p (or 1280x800). (Still waiting to hear from the guy on Reddit that I messaged about HDFury 3D.)

He also mentioned that I could buy the service cable on AliExpress and use DAS to service the monitor, which he apparently already did. Still no idea what the specific cable (the W900 and the F520 service manuals mention the specific part number, but can't find anything about it) is, waiting to hear back from him, but the guy was incredibly helpful.

And yes, I've noticed some red shift with my monitor so I will most likely need a service cable. My monitor was made in June 1999 and I think Sony's G2 problems started in 1998 and ended in 2002.
Frosal
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Frosal »

This is the cable apparently: https://www.aliexpress.com/item/32880986077.html (use at your own risk, check pinouts first)

"DB9 RJ45 Camera Control Cable Extension Cord Short Length for Sony VISCA Daisy Chain PTZ EVI/BRC/SRG rs232 series cameras" (web archive: https://web.archive.org/web/20220811053 ... 4itemAdapt)

Using DAS (DOS version): https://www.youtube.com/watch?v=Lt1NtRH4BOg

Starting from 20:30, it seems that factory preset modes might be editable.

Sony service manuals for DAS versions:

http://nonzero.narod.ru/lit/DAS_C_p0034.pdf
https://usermanual.wiki/Document/DASDig ... 813761.pdf

Download DAS: https://archive.org/details/sony-das-original

This is also useful for other Sony monitor models.
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by H6rdc0re »

I also have a W900 and found this PDF of the cable pinout some time ago. Much better to construct your own cable according to the PDF than buy some random cables on AliExpress.

W900 Cable Pinout
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by BazookaBen »

Gunstar wrote:Sorry to hijack this thread!
On my Lacie IV (max res 1920x1440), 1080p would often not sync or if it did it would show an image with the sides cut off, with the monitor's OSD option not able to squeeze it in
I have the electron22blueIV, and I can get 1080p from consoles to display, but since it's LCD timings the picture warps at the far edges.

I don't find this to be too big of a deal though. I just overscan those warped parts, and it comes out to about 5% overscan, which is far from game breaking.
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by Gunstar »

BazookaBen wrote:
Gunstar wrote:Sorry to hijack this thread!
On my Lacie IV (max res 1920x1440), 1080p would often not sync or if it did it would show an image with the sides cut off, with the monitor's OSD option not able to squeeze it in
I have the electron22blueIV, and I can get 1080p from consoles to display, but since it's LCD timings the picture warps at the far edges.

I don't find this to be too big of a deal though. I just overscan those warped parts, and it comes out to about 5% overscan, which is far from game breaking.
Looks like you got a lot more to play with on the 22 model, mine is only a 19, sadly. Not seen any warping but then again I can't even fit the whole 1080p picture into view. I have Extron 301 now so will see how things go, if not looks like the OSSC Pro will let you change the timings to something a PC CRT will like
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by BazookaBen »

Gunstar wrote:
Not seen any warping but then again I can't even fit the whole 1080p picture into view.
I think we're talking about the same thing but wording it differently.

Have you tried squeezing the raster as close to a 16:9 image as you can, with maybe leaving a little bit of overscan on the right and left sides?
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by M3Patterns »

I feel so dumb, but I had no idea that reduced blanking (AKA LCD) timings existed.

Are all component timings non reduced blanking, then? Would that mean that running 720p or 1080i/1080p through component, with a component to VGA converter, would solve the issue?
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by BazookaBen »

M3Patterns wrote:Are all component timings non reduced blanking, then? Would that mean that running 720p or 1080i/1080p through component, with a component to VGA converter, would solve the issue?
Worth a try.

But even when I used 720p over HDMI I didn't notice it was using reduced timings, that was just 1080p really
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by M3Patterns »

BazookaBen wrote:Worth a try.

But even when I used 720p over HDMI I didn't notice it was using reduced timings, that was just 1080p really
I just found out that 720p over HDMI is using reduced timings. It's using the CTA-861 standard, but a CRT should be using the regular CVT standard.

More info here:
https://en.wikipedia.org/wiki/Coordinated_Video_Timings
https://en.wikipedia.org/wiki/Extended_ ... ation_Data

I also found this super helpful page: https://tomverbeure.github.io/video_timings_calculator .


Checking that page for 720p shows that CTA-861 is using only 14 fewer total horizontal and 2 more total vertical pixels for blanking intervals. That's got to be why 720p over HDMI is inconsistent on this monitor, as it seems to be very close to actual CRT timings, but not quite there.

The math on that page also matches what I documented earlier, which was that 720p was syncing for me on the piLag at 44.8 kHz / 59.85 Hz AND that both 60/59.94p synced at 59.85 Hz. All those numbers match the CVT standard.

I also just got a completely different PC-style monitor that will take 720p. Doing that over HDMI has some moderate geometric distortion/waviness around the edges, while known CRT timings have perfect geometry.

Looking at that timings calculator page also shows why 1080p isn't working - the CTA-861 spec is much further off CRT timings: 376 fewer horizontal pixels.


I just purchased a component to RGB VGA transcoder, but it will take several weeks to get here. I'll report back when I test it out.
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BazookaBen
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by BazookaBen »

M3Patterns wrote: I just purchased a component to RGB VGA transcoder, but it will take several weeks to get here. I'll report back when I test it out.
You found one that can handle 1080p? A lot of them are only good for 720p and 1080i
M3Patterns
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by M3Patterns »

The Retrotink COMP2RGB does say that it handles 1080p.

I actually went with the wakabavideo / linuxbot3000 component to VGA converter, as I both wanted to avoid SCART in favor of D-sub, and wanted to connect it as RGBHV. It is only listed as going up to 1080i, which is actually fine for my use case. If it works correctly for 720p component, I may try the Retrotink as well.
H6rdc0re
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by H6rdc0re »

M3Patterns wrote:The Retrotink COMP2RGB does say that it handles 1080p.

I actually went with the wakabavideo / linuxbot3000 component to VGA converter, as I both wanted to avoid SCART in favor of D-sub, and wanted to connect it as RGBHV. It is only listed as going up to 1080i, which is actually fine for my use case. If it works correctly for 720p component, I may try the Retrotink as well.
If you have one you might want to try the OSSC. It’s also a great signal converter. I have mine connected in a pure pass-through mode.
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kitty666cats
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Re: GDM-W900 problem with LCD timings [720p & 1080p @60Hz]

Post by kitty666cats »

If anyone tries SMPTE 1080p from PS3/PS4/Switch/consoles and converting it to VESA 1920x1080p on an Extron DSC 301 HD, lmk how the results are. 1080p HDMI being incompatible with PC CRTs from certain consoles is a known, common thing. I have a feeling the DSC 301 HD just converting it to VESA timings may possibly fix things, as well as fix the limited/full range RGB issue a lot of DACs have haha
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