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Samsung LCD tv to PC connection problems

Last response: in Graphics & Displays
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May 20, 2013 2:16:14 AM

Hi, I'm new here so sorry if I posted this in the wrong section.

My problem is this -
I've just bought a secondhand Samsung 46" LCD tv (model number LA46M81BDX/XSA) and connected it to my PC via a VGA cable. When I change the tv source to the PC channel it displays my extended desktop (the way I had it set up with the tv the Samsung replaced, a Toshiba 42" LCD) for approx 3 secs then seems to switch off ie. it clicks and the screen goes black. When I press the source button again it goes back to the av channel, but takes a couple of seconds to fire up, the same like it does when I turn the tv on.

I'm using a Dell Inspiron 550 Dual Core with a NVIDIA GeForce 210 grahpics card and running Windows 7 Home Premium x64. If you need more system details I'll happily supply them.

Thanx in advance for any help.
a b x TV
a b Ô Samsung
May 20, 2013 3:09:53 AM

The VGA output may be set to an unsupported combination of resolution and refresh rate. Right click on the desktop, goto screen resolution and check the settings. 1920*180p at 60Hz should work.
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May 20, 2013 2:52:47 PM

Thank you for the suggestion noidea.... I tried it, but to no avail.
I looked up a user manual for the tv, but it only covered Win XP, and the resolution/refresh rate figures (a lot of them) they gave confused me and there was no mention of a vga input, the closest was 'vesa'.

Update - I tried several different resolutions and the only ones that didn't switch the tv off were 1600x1200, 1280x1024, 1280x960, 1200x800, 1152x862 etc. (all at 60Hz, it won't let me change the refresh rate). The trouble with these settings is they all stretch the display.

Another Update - the NVIDIA Control Panel says the refresh rate is 60Hz and gives me no other option, whereas the onboard Screen Resolution settings say the monitor is set at 59Hz and won't let me change it to 60Hz (the option is there, but every time I click 60Hz/apply/ok then reopen the window no changes have been made, it's back at 59Hz). Also, the tv is plugged into the VGA output on the graphics card (my mobo won't let me run a graphics card & onboard graphics at the same time)
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a b x TV
a b Ô Samsung
May 21, 2013 5:54:55 AM

For the VGA input, the manual says:
"1600 x 1200 75.000 60.000 162.000 + / +"
"1920 x 1080 66.587 59.934 138.500 + / -"
As you can see, the 60Hz are not supported with the 1920 resolution, so the 59Hz sounds right. I have no idea, why it doesn't work at 1920*1080.
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May 21, 2013 8:27:13 PM

noidea_77 said:
For the VGA input, the manual says:
"1600 x 1200 75.000 60.000 162.000 + / +"
"1920 x 1080 66.587 59.934 138.500 + / -"
As you can see, the 60Hz are not supported with the 1920 resolution, so the 59Hz sounds right. I have no idea, why it doesn't work at 1920*1080.


Thanks again noidea, I found the figures you mention and it makes a little more sense now.
But yeah, the tv still does the "switch off" thing at those settings.
It doesn't actually turn off, the LED on the power button flashes and if I leave it in that state for a few minutes then turn it back 'on' the computer channel the picture stays for longer before it 'switches off' again.
Would doing a factory reset on the tv help? Or would it just make things worse?
Thanks again for your help.
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Best solution

a b x TV
a b Ô Samsung
May 22, 2013 3:48:52 AM

A little google research says you are not the only one with this problem. It seems to be a more electrical problem with the sync signal. I couldn't find a solution so far. I've seen problems like this with other devices and sometimes a different / better / shorter cable helps to fix it, but there is no guaranty.
http://www.justanswer.com/tv-repair/7kks0-samsung-46-in...
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May 25, 2013 10:27:21 PM

Ok, after a busy weekend I've finally had a chance to re-address the problem again.
I tried your suggestion of a different/shorter cable, but the problem persisted.
I then tried using an HDMI cable (to the HDMI output on my graphics card) and voilé ! the problem is solved !!
So to anyone having the same problems I did, I recommend trying to go the HDMI way.
And many thanks to noidea, your suggestion of changing cables made me look in a long forgotten box where I found a spare HDMI cable !!
(is there somewhere I can click 'solved' for this thread?)

(update ~ found a solved button ^_^ )
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