The Self Diagnostics option is a set of diagnostic features that are built into the Help or Customer Support menu of the TV to help customers diagnose and resolve basic setup and configuration issues.
How to perform the Self Diagnostics
The following are examples of how to start the Self Diagnostics test. Choose your TV model type from the following.
If you did not observe any problems with the test pictures and sound, the TV is functioning correctly. If you are experiencing picture or audio issues while using an externally connected device, verify the physical cable connection between the TV and the device as well as the external device settings.