My LG led google tv won't let me adjust the picture such as image size, brightness and etc. how can I enable this option so I can change the brightness?

Have you replaced the main board in the TV by chance?

Question edited for clarity.

Common issue with those sets.

https://www.google.com/search?q=lg+led+tv+picture+upside+down

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Go to menu, picture and adjust as desired

LG 42LS5700 - LG.com

www.lg.com > Home > Support > Product Support

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Many units will self adjust the image size, but the size of the image you will see depends on what size it was originally recorded in. You can change it in the settings of the TV but most likely it will not go bigger if it was shot smaller.

You can change the picture size by using either the TV remote or the cable box remote (which ever you are using). Just go into the TV settings option, scroll through the different options that adjust everything from color and tint, sound, contrast, etc, and you should find one for changing the screen size (my Sony TV can be changed from normal, and wide, to wide zoom).

Check to see if you have a daylight savings option in your TV's settings. It will adjust the screen automatically according to the light changes in your home if it is enabled.

Follow the below mentioned steps :

1.Turn on the LED TV and let it warm up for 30 to 40 minutes before making any changes or adjustments.
2. Put on the lights that you would normally use when watching the TV. You want to create the same ambiance that would constitute normal watching conditions for you. Make sure there is no glare or reflection from other items in the room such as a mirror.
3.Open the menu on the screen of the LED TV with your remote control and find the options for adjusting the color, contrast and brightness. Menu options will vary by TV, but look for options that will say "Contrast," "Color" and "Brightness."
4.Start with the "Brightness" control. It would be best to have a DVD playing so that you can get a better idea of the control settings. Pause the picture at a place that you can see a variety of scenery, such as sky, mountains and people in the forefront. Adjust the "Brightness" by pressing the up and down arrows until you are happy with the picture. Press "Save" or "OK" to set the brightness at this level.
5.Repeat this with the "Contrast" and "Color" controls, remembering to save your settings. Look for the "Mode" setting. Press the arrow to get to "Normal" or "Movie/Cinema." Press that setting and save it.6.Turn off any settings that are titled "Flesh Tone Correction" or "Vivid Sports." These will make the colors unnatural, use up energy and damage the TV over time.

Hi,
The TV may be in Dynamic Mode - which would cause the screen to change brightness.
To change this you have to go to the picture settings and change it to Normal mode or cinema mode etc.

To adjust the display settings:

1. Press the flywheel control. The main menu appears.

The current display settings appear across the top of the main menu.

2. Rotate the flywheel to highlight an option. The name of the
highlighted option appears in the center of the menu.

3. Press the flywheel control to select the highlighted option, then
rotate the flywheel to adjust it.

Some options can only be enabled or disabled. There are also some
options that contain additional menus.

4. Repeat Steps 2 and 3 until you have made all your changes.

5. Rotate the flywheel control until Exit is highlighted, then press
it to exit the OSD control system.


OSD OPTIONS:

Contrast increases or decreases display image contrast.

Brightness increases or decreases display image brightness.

Horizontal Size increases or decreases the width of the display image.

Horizontal Position moves display image to the left or right side of
the screen.

Vertical Size increases or decreases the height of the display image.

Vertical Position moves display image to the top or bottom of the
screen,

Pincushion curves the sides of the display image inward or outward.

Trapezoid increases or decreases the trapezoid distortion of the
display image.

Degauss removes magnetic discoloration from the display image.

Recall returns most options to the original factory default settings
if the monitor is currently using a preset video mode. (See the “Video
modes” section in this guide for information about the factory preset
modes.)

Advanced Option opens the Advanced Option menu. Color opens the Color
Manager menu.

Language changes the display language for the OSD control system.

User displays information about the monitor’s preset modes.

OSD Manager moves the OSD control window on the screen.

Exit closes OSD control system.