Main > Monitor/Video Forum
HDMI to Old CRT
buttersoft:
No need to apologise, garbled is probably fine for what you're talking about. I merely wanted to clarify what was going on.
Not having the modelines installed should not be a problem. Activating EDID emulation will read the monitor preset, and spoof an EDID based on that, so it should be pushing 480i when you do it. I believe you are selecting the right display head of the GPU as otherwise you wouldn't get anything onscreen, garbled or otherwise.
What is the CRT you are trying to connect to? If it's a PAL CRT, you should be using the PAL preset (at least to troubleshoot, which is where we are now). Do you own a multimeter? Most are capable of reading frequency. You could use one to read pin 13 of the VGA output and see if it reads 15kHz. It probably will, which would me it's probably not the PC at fault.
You have the TV working? With RGBS? Or you don't have any other RGBS sources, and you're trying the RGB-mod for the first time with this PC? something isn;'t
Zebidee:
For whatever reason, the forum site has suddenly decided that I can't see the pics you've attached unless I deliberately download the file and open it in a separate viewer app.
What this means is, commenting on your post, on any post with pics directly attached, is really hard
abstract3000:
--- Quote from: buttersoft on September 29, 2023, 05:23:46 am ---No need to apologise, garbled is probably fine for what you're talking about. I merely wanted to clarify what was going on.
Not having the modelines installed should not be a problem. Activating EDID emulation will read the monitor preset, and spoof an EDID based on that, so it should be pushing 480i when you do it. I believe you are selecting the right display head of the GPU as otherwise you wouldn't get anything onscreen, garbled or otherwise.
What is the CRT you are trying to connect to? If it's a PAL CRT, you should be using the PAL preset (at least to troubleshoot, which is where we are now). Do you own a multimeter? Most are capable of reading frequency. You could use one to read pin 13 of the VGA output and see if it reads 15kHz. It probably will, which would me it's probably not the PC at fault.
You have the TV working? With RGBS? Or you don't have any other RGBS sources, and you're trying the RGB-mod for the first time with this PC? something isn;'t
--- End quote ---
Ok so The Monitor is an NTSC SHARP 27R-S100
It has never been hooked up to and worked with the PC This is a First time
I know the RGB Mod was done as seen in the photo above that is the monitor, My friend demonstrated the mod with a Sencore CM2125 Monitor Analyzer he has in his shop.
I took the measurement off the Multimeter I get 15.7 kHz on Pin 13, & 60kHz on Pin 14
I tried slightly adjusting Screen Voltage on the Flyback with no Success, but let me explain the following:
When disconnecting the the VGA very slowly I noticed something appear on the screen. I started just jolting the cable around and for the brief Second I saw the image show up on the CRT but quickly disappear. I discussed it with my friend who stated while a loose connection is always a possibility is more inclined to believe my connecting and disconnecting was disrupting the sync lock and i was seeing the image prior to the lock taking place. So he does not know anything about the CRT Emudriver but asked if there was a Way for the Software to Invert the signal for shits and giggles.
Hopefully i have answered all your questions, if not feel free to ask anything else and i will see what info I can get :)
--- Quote from: Zebidee on September 29, 2023, 12:59:12 pm ---For whatever reason, the forum site has suddenly decided that I can't see the pics you've attached unless I deliberately download the file and open it in a separate viewer app.
What this means is, commenting on your post, on any post with pics directly attached, is really hard
--- End quote ---
Sorry about that i was uploading the photos first on imgBB and doing the img tags around the link but they would not show after posting so I started attaching afterwards, I will provide the direct links below to the images :)
https://ibb.co/q0Wb56L
https://ibb.co/r6mTpwq
https://ibb.co/9w5x8Gy
And here is the img tagged ones let me know if you can see them
abstract3000:
Well may have solved the issue, I can manage to get the picture on the screen, but not perfect. The black/white/Red/Blue/Green wires on the end appear to be the issue if I touch the resistor next to any of R/G/B the screen shows up in whichever hue I'm missing. MY friend asked if there was a way to send the Signal via TTL and stated that the circuit was built for sending to a CGA monitor :/
So if the software cant bend to that spec, he would need to redesign the board at best removing the resistors and decoupling caps..... Though he has to get the PC and try and figure out what kind of Signal is being sent from the Video Card, I didn't seem to see any documentation on it but i will keep digging.
PL1:
--- Quote from: abstract3000 on September 29, 2023, 03:59:55 pm ---And here is the img tagged ones let me know if you can see them
--- End quote ---
To embed the image in your post, you need to use the actual image URL, not the page URL.
On the page, right-click on the image thumbnail and open in a new tab.
For example:
- The first page you linked to is https://ibb.co/q0Wb56L.
- The image that page's thumbnail links to is https://i.ibb.co/1sdH6cY/crt.jpg.
- Put that image URL in IMG tags like this . . .
--- Code: ---[img]https://i.ibb.co/1sdH6cY/crt.jpg[/img]
--- End code ---
. . . and you get the full size image like this . . .
. . . or add width and/or height in pixels to scale the image. (readers can click on the image to blow it up to full-size.) ;D
--- Code: ---[img width=350]https://i.ibb.co/1sdH6cY/crt.jpg[/img]
--- End code ---
That said, it is better in the long term to upload images either here in your thread or -- the preferred approach -- upload them to the latest stickied "NOT A PROJECT" thread at the top of the Project Announcements sub-forum.
- IIRC Saint backs that thread up separately from the rest of the forum so the rest of the backup runs more quickly.
- Many great project threads have been rendered almost useless due to image hosting companies either going out of business, or changing their terms of service, or moving to new servers, or sites being hacked by spammers, or . . . .
Scott