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Is there any way to use the iMac as just a monitor? To connect any device with a VGA cable, even if i have to make some modifications ?
Ist dies eine gute Frage?
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Funny you should ask, Yes you can pump the video to the display but it's not as simple as just plugging in a cable into the video board. These older displays only offered a Native Resolution 800x600 on the 15.0" (13.8" viewable area) screen. The display also supports: 640x480 at 117 Hz, 800x600 at 95 Hz, and 1024x768 at 75 Hz.
A small music group wanted to drive the screen with a video feed externally as a special effect. While we were able to get it working the image just wasn't stable for what they wanted. Ended up painting the display for a green screen fill-in.
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My intention isn't to use the monitor for 100% practical purposes, like playing video games, etc. I like to experiment with the screen, and even if the result isn't the best, I like to have the monitor on so I can transmit whatever the result is. So my main goal isn't to have a perfect monitor, but to be able to use it externally and see what we can achieve.
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@lucasbiffi is yours a slot loader or a tray loader? You do know that CRT's pack a punch due to the high voltages involved with this. If you are not familiar with that you may need to reconsider. Just as a starting point, make note of this and save it :
VGA to iMac
1 red video --- 17
2 green video --- 15
3 blue video --- 13
5 gnd --- 3
6 red rtn --- 18
7 green rtn --- 16
8 blue rtn --- 14
10 gnd --- 3
12 S data --- 1
13 hsync --- 9
14 vsync --- 11
15 S clock --- 2
Pins from little white 14-pin connector on video board end of salvaged video cable to VGA connector:
1 black SCL to VGA pin 15
3 yellow SDA to VGA pin 12
4 white vsync to VGA pin 14
6 blk/wt hsync to VGA pin 13
2 org ground to VGA pins 5 and 10
11 grn Power On to power board's signal inverter
You may need that pinout to connect VGA to the monitor.
von oldturkey03
I confess I'm not very experienced. But I'd like to try. As I mentioned in the comment below, my intention is to have a monitor not for 100% practical use, like playing a video game, but rather to stream something to it, even if the quality isn't the best. I like to keep a few CRTs like this on display here at home.
von Lucas Biffi
@oldturkey03, As soon as I have the iMac in hand I will bring more information here
von Lucas Biffi
@lucasbiffi so basically you just want the CRT do display a VGA signal; not necessarily using it as an iMac? If so, then yes, that can be done.
von oldturkey03
@oldturkey03 Exactly. I like to use a Raspberry Pi to automate some images to pass through my CRTs. I also like to connect cameras to them for a sort of local streaming. Just as a design object. I think I'll receive the device today, so I can confirm some other information to understand how to do this signal conversion.
von Lucas Biffi