1. Can't Connect with Network or Apps (For internet supported model only)

Make sure there is a network connection
(Menu > Network > Network status)
Contact your service provider

2. No Picture/Sound or Distorted Picture/Sound with an External Device

Make sure your connection to the device is correct.
Perform a TV Self Diagnosis to identify the problem
(Menu > Support > Self Diagnosis > Sound or Picture Test)
Change the picture size (Use "P. Size" button on your remote)

3. Poor Picture Quality

Verify your signal is High Definition or Standard Definition
(Contact your service provider)

4. Your Settings are Lost after 30 Minutes

Change to Home Mode
("Tools" on your remote > Store Demo Off)

5. "Weak or No Signal" Displayed in TV Mode / Cannot Find Channel

Press Source button on your remote
Run Auto Program and search for channels
(Menu > System > Plug & Play > Enter)