How do I change my LG 4k to a higher resolution.

1. Press MENU on your set-top box remote control.
2. Use the RIGHT ARROW button to select SETTINGS on the horizontal menu bar.
3. Select SYSTEM OPTIONS, and then scroll to SELECT SCREEN ASPECT RATIO AND HIGH DEFINITION press the OK button.
4. Select Screen aspect ratio and high definition, and then press OK. The Screen aspect ratio and high definition Settings screen appears.
5. Select the desired aspect ratio and resolution, and then press OK:
   1. 4:3 standard definition. Used for ordinary televisions.
   2. Widescreen standard definition. Used if you have a wide-screen TV (16:9 aspect ratio) that does not display in high-definition.
   3. 720p on high-definition screens. Used if you have a wide-screen TV that displays images 720 pixels wide (this is sometimes called "enhanced definition").
   4. 1080i on high-definition screens. Used if you have a wide-screen TV that displays high-definition images (1080 pixels wide). Note Depending on you set-top box model, the following item in the list might also appear, enabling you to set the display for 1080p format.
   5. 1080p on high-definition screens. Used if you have a wide-screen TV that displays high-definition images (1080 pixels wide) in 1080p format.
6. If you select an SD mode setting (either 4:3 SD or Widescreen SD), and then click CONTINUE, the change is made, and you go back to the SETTINGS menu. If you click Cancel changes, the change is not made, and you go back to the SETTINGS menu.
7. If you select an HD setting (720p, 1080i, or 1080p) and then click CCONTINUE, the HD Mode wizard appears. The HD Mode wizard enables you to check that the TV can display HD content properly.
8. You will be prompted to KEEP SETTING (or you can cancel the changes). Press OK.

Today's TVS are mostly IN 4K, but sometimes the picture is blurry and of poor quality. You want to set the definition of your TV to get a better picture. Most TVS don't need to be set up because it's not the problem of TV, it's the source.

Whether it is TV programs or movies and TV series on the network, the first thing to see the source of the resolution, the closer to 4K, the clearer, the better the effect. Conversely, the effect is poor and fuzzy. Because we basically need not the effect in the picture in the picture, full screen plays the effect not ideal again, so now TV of big size liquid crystal has watch a distance. It looks good at a distance. If it's not clear, the source is too bad and the resolution is too low to change.

BTW, you can also watch 4K video ob PC and then playback with free 4K video player. Here is the recommendation.
www.leawo.org/tutorial/5-best-4k-video-player-software.html?fixya=1410

I had an LG tv before and had this problem because 720p resolution wasn't enough for me. I can recommend you to find your LG tv model at http://lg.manymanuals.com/
You can choose the necessary manual and find out hot to change to higher resolution.

It depends on your source video resolution. If you're willing to play in 4K, you can upscale your 1080p or 720p video to 4K resolution in advance. Here is the video tutorial:
After conversion, it will be played in 4K on your TV. Of course, it's all based on that your TV supports 4K.

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Check more details: http://4k.com/tv/

You cannot change anything from the tv side. TV automatically select the resolution based on the content you are playing. Play a 4K video the tv will take care of it.