questionshow do i use my lg smart tv as a computer monitor?

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HDMI from the PC to the TV, or if your computron doesn't have HDMI maybe a DVI or VGA cord instead. If you need any of those cords try monoprice.com they have really good prices and from what I can tell, excellent quality.

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It's all about matching your computer's outputs to your TV's inputs. Can you tell me what outputs your computer has?

1. VGA
2. DVI
3. RCA
4. S-Video
5. HDMI
6. Component

I'm guessing your TV is new-ish and has a lot if input options. It should be fairly easy to connect if the TV is near the computer.

A more expensive solution is to get a wireless streaming setup like this:
http://www.woot.com/offers/nyrius-wireless-hdmi-sender

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To use @bsmith1: picture, I use option 1 and get true 1080, this is believe is unusual. Option 1 does not carry the audio.
Your best bet is option 2 and 5. (Some HDMI and DVI carry the audio signal).
3 would be the worst picture, followed by 4 then by 6.
5 and 2 you will have the best picture, and 1 is a crap shoot. (As I mentioned before I got lucky on that one) (you will get the best picture if you change your computer resolution to 1920x1080)

I have thought about Android on a stick.

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I have a DVI to HDMI cable on my PC to my T.V. Works great.
My sound is done separately through my stereo.

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@wickedd365: yep. I've done just about every configuration you can think of... I even had the RCA yellow video out on an old PC going to a S-Video converter to the TV. (because I needed a long cord to reach TV in another room) I also had a long 3.5mm audio cable going to an RCA (red/white) audio adapter for sound. I used the TV as a 2nd monitor to mirror the computer's screen for watching videos.

Nowadays, I do HDMI to HDMI from laptop to TV. I also have another media/security camera PC without HDMI so I do DVI to DVI with a separate 3.5mm audio cable for stereo sound. If you want surround sound, you pretty much need audio going through HDMI or Optical cable.

There are adapters for almost every situation. You'll only run into trouble trying to go from analog to digital signals and vice versa. In those cases, the "adapters" are powered boxes to convert the signal and they can be costly.

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@bsmith1: Not to be picky but your #4 image is not an S-Video connector. S-Video only has 4 pins like this image:

What you have is a MiniDin-7 socket:

The mini din-7 is usually capable of carrying both composite video and audio with a special cable.

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@cengland0: Good catch. Wasn't my image, so I just made an assumption. I'll stop talking now, cuz you're way smarter than me. I also don't know the differences in the DVI connections. I don't know how you tell if they carry audio or not.

Plus, I don't think the OP will be back anyway.

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@bsmith1: As far as I'm aware, none of the DVI connectors carry audio.

There are, however, two different DVI connectors. One is DVI-I, the other DVI-D.

WIthout discussing the dual link versus single link, the real difference between DVI-I and DVI-D is that the "I" version has 4 additional pins next to the horizontal bar pin. It is used with an adapter to convert the DVI signal into VGA. Without those, the DVI to VGA adapters will not plug in or work.

When you look closely at the adapter, you can see the additional 4 pins are populated and will not plug into a DVI socket that does not have the holes to accommodate those pins.