Panasonic TC-55AS650U Service Manual

Also see for TC-55AS650U: Owner's manual Ehelp

167.2. Power LED Blinking timing chart1. SubjectInformation of LED Flashing timing chart.2. ContentsWhen an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, thedefective block can be identified by the number of blinks of the Power LED on the front panel of the unit.7.3. LCD Panel test modePurpose:To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed.How to Enter:While pressing [VOLUME ( - )] button of the main unit, press [OPTION] button of the remote control three times within 2seconds.How to Exit:Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.How to confirm:If the abnormal picture is displayed, go into LCD Panel test mode to display the several test patterns.And then, judge by the following method.Still abnormal picture is displayed: The cause must be in LCD Panel.Normal picture is displayed: The cause must be in A board.Remarks:The test pattern is created by the circuit in LCD Panel.In LCD Panel test mode, this test pattern is displayed unaffected by signal processing for RF or input signal.If the normal picture is displayed, LCD Panel must be okay and the cause of failure must be in A board.Blinking Times Contents Check point1 LED driver: BL_SOS LCD PANELP-Board3 Power on Problem(No F15V / SUB3.3V / SUB1.5V voltage)A-BoardP-Board7 No voltage SUB3.3V detected A-Board9 Audio Amplifier: SOUND_SOS A-BoardSpeaker12 Back End SOS (inside of Peaks) A-Board13 Emergency SOS A-Board