Some types of noises are normal in an LCD, LED, and/or Plasma Television. You will need to determine the type of noise to properly troubleshoot the issue.
Having volume present
Increase the volume to a setting between 30 and 50. Listen for the popping/cracking noise to see if it is coming from the TV speakers or inside the cabinet.
If so, check multiple channels and inputs.
If not, it is normal for the television cabinet (Television case) to expand and contract due to varying heat temperatures and this may result in the cabinet producing a popping or cracking noise.
Note: The cabinet may vibrate if the volume level is set too high.