1.Press and hold INPUT and V- buttons on control panel at the some time while plugging in appliance
2."K" should bi displayed on the scren
3.Relase buttons
4.Press V- and CH- buttons to enter service mode
5.Press UP/DOWN buttons to select settings
6.Press LEFT/RIGHT buttons to adjust values
7.Press OK button to enter the selected settings
8.In LAMP options clear LAMP errors
9.Repeat poit 1. to exit service mode