59FAQs, etc.Frequently Asked QuestionsProblem ActionsBefore requesting service or assistance, please follow these simple guides to resolve the problem.If problem still persists, please contact your local Panasonic dealer or Panasonic Service centerfor assistance. For details (p. 63, 64)No sound is producedWhirling sound isheardSound is unusual• Is “Sound Mute” active? (p. 12)• Is the volume set to the minimum?• Is “Speakers” set to “Off”? (p. 32)• Change “SAP” settings. (p. 19)• Check “HDMI1 in” or “HDMI2 in” settings. (p. 32)• Set “SAP” setting to “Stereo” or “Mono.”• Check the HDMI device connected to the unit.• Set the audio setting of the HDMI device to“Linear PCM.”• If digital sound connection has a problem,select analog sound connection.• The sound is from built-in cooling fan(not a sign of faulty operation).“Press any key to return”moves on the screenScreenOne spot remains darkChaotic image, noisyNo image can bedisplayedOnly spots are displayedinstead of imagesNeither image norsound is produced• The function to prevent “after image” is activated.(Not a faulty symptom)The screen saver is activated if the TV unit is not operated fora certain time in SD mode.“after image” (p. 5)• A pixel or luminescent spot can occasionallybe missing in plasma displays.(Not a faulty symptom)• Check nearby electrical products(car, motorcycle, fluorescent lamp).• Check Picture menu (p. 32)• Check the channel settings. (p. 40)• Check the antenna cables.• Is the AC power cord plugged into the outlet?• Is the TV unit turned On?• Check Picture menu (p. 19) and volume.• Are the remote control codes correct? (p. 49-50)Black Box appears • Change settings of Closed Caption (CC). (p. 42)“Control with HDMI”function does not work • Switch the TV unit on again with the equipment on.• Set “Control with HDMI” to “Off”, then set to “On” again.(p. 34)Sound HDMI