• Press and hold the {VOL -} button ON THE PLASMA.
• Then press the {INFO} button on the remote control 3 times.
  
  
• The Service Menu will be displayed with the following options:
  
  
  • ADJUST {Picture Adjustment}
  • WB-ADJUST {White Balance Adjustment}
  • OPTION {Option Setting}
  • V-SUS {V-SUS Adjustment}
  • AGING
  • SRV-TOOL {Service Tool}

  {1} & {2} buttons move through options

  
  
• Press the {2} button once to select "SRV-TOOL".
  
  
• And press the {OK} button to access it.
  
  
• Using the cursor keys, highlight the right side
  of the last item "PTCT :00.00.00.00.00" :
  
  
  
  
  
  
• Then press and hold the {MUTE} button for 3 seconds.
  
  
• Time and Count will be displayed in red color:
  
  
  
  

  __TIME = Hours : Minutes of operation. 
  COUNT = Times the Plasma was powered on.

  
  
• To exit, unplug the power cable.

_<<<<<<<<<<< WARNING BY BRUZZI >>>>>>>>>>> 
_-The {VOL+} & {VOL-} buttons are used to change values
_-while in the Service Menu. Make sure not to touch those
_-buttons anytime while checking the hours used.

Link:  http://www.highdefjunkies.com/showthread.php?1772-The-Official-quot-How-to-Check-the-Hours-Used-on-Your-Plasma-quot-Thread - http://www.highdefjunkies.com/showthread.php?1772-The-Official-quot-How-to-Check-the-Hours-Used-on-Your-Plasma-quot-Thread