View Full Version : VGA out from laptop problem
8th April 2002, 03:04 PM
i've been humming and harring for a while and eventually made a decision over scan converters, i got the 'trust televiewer 1600', it was ?70 and seems pretty good quality etc. i haven't put it through its paces yet, but expect a review sometime soon. anyhow there is one big problem with it, although it probably is'nt its fault.....
connected to the scan converter is the VGA through cable one end goes in the VGA on your computer the other end attatches to the monitor - no problem...however with a laptop you obviously don't want to have to connect to a monitor - this is where the problem is, my laptop will not send an external VGA signal unless there is something attatched to the VGA cable (it does not see the scan converter) - even if the monitor attatched to the cable is switched off it still works fine...
here are the questions:
1. is this typical laptop behaviour? do all laptops have to 'see' something connected, to export VGA? i hope not (i don't actually use my laptop for vjiong, its a dell 266, i borrow a friends laptop where hopefully this won't be a problem)
2. can i construct something that will fool the laptop into thinking a monitors connceted and so send VGA? for example grounding all the VGA pins??
3. errrr thats it.
ps. i am the first to post!!!!!!
8th April 2002, 03:42 PM
This is a pretty basic thing, so it probably won't help...but just in case:
There's normally a FCTN+key that forces your laptop to output through the VGA output regardless of if it detects something or not. I had the same problem trying to get a laptop to output to a powered down projector (I had it dolly-chained to another projector after that we were using earlier on).
8th April 2002, 03:43 PM
You will usually find on laptops that if you hold Fn + F5 or F6 it switches between LCD and VGA out. Try that. It works on most laptops.
8th April 2002, 03:54 PM
Isn't it possible to have both LCD and VGA out? Just wondering because I never tried. I have a graphic card with twinview so I always set it up as 'clone' when I need to do this.
8th April 2002, 03:55 PM
Yup, there's usually three modes to switch between : LCD, VGA, and LCD/VGA
8th April 2002, 04:06 PM
fnc f8 - cycles thru LCD, LCD and VGA, VGA, but unfortunetly it only works if a monitor (on or off) is attatched to the VGA port, the scan converter on its own doesn't seem to be enough....
thats why i wondered if grounding the cable to monitor pinsmight trick the computer into thinking its attatched to a montior??? i guess i ought to try this, its unlikely to damage anything isn't it (errr... isn't it)
keep trying :)
9th April 2002, 05:21 AM
Hmmmm tried forcing it to the VGA port with the screen properties or the properties of the video card settings???
Yeah personally I would have though the Fn+F(no.) would have worked (works on every one I have seen)
Although I think you should really be calling Trust tech support on this one...
Yeah and cross your fingers for your friends laptop to work.... personally I would test your new scan on a few laptops, and also try to test your/your friends laptop with a few scannies. Then you found find out whats @ fault.
10th April 2002, 03:20 PM
after a lot of surfing i've solved the problem. some computers including mine look for a monitor (it would seem most don't), there seem to be various ways they can detect monitors:
1.a combination of pins 4, 11, 12, being grounded or not connected
2.plug and play pins 9,12,15
3.is the RGB signal being delivered? pins 1,2,3
macs are different.
anyhow after using my multimeter rather a lot i found my laptop was detecting using method 3 so this morning i built a vga dummy (costs ?3) and now everything is sweet.
watchout for VGA dummy tutorial on vjcentral
and trust televiewer 1600 review coming soon (so far it looks good but doesn't save zoom position, but this is'nt a problem as you seem to be able to move the zoom box anywherre on the screen)
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13th May 2008, 01:57 PM
We had this problem at work with laptops permanently plugged into installation projectors via VGA 15 pin cables. Try the BIOS settings > Video output RGB Analog and LCD on Startup.
Worked for me.
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