5 Troubleshooting Guide5.1. Self-check functionWhen phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at thetime of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits.Also,when "the power fails from time to time", display on the screen can be used to confirm the occurrence and to limit the scope forthe defective circuits.Any programmed channels, channels caption data and some other user defined settings will be erased and return to factory setting.5.1.1. How to access5.1.1.1. AccessProduce TV reception screen and, while pressing [VOLUME-] button on the main unit, press [SLEEP] button on the remotecontroller unit simultaneously.5.1.1.2. ExitWhen one of the buttons for channel selection etc. is pressed, the display returns to the normal screen.5.1.2. Screen displayDisplay Ref No. Description P.C.BMEMORY IC1106 EEPROM DG-BoardTNR1 TU3001 Tuner H-BoardMTS IC3002 TV sound multiplex decode H-BoardSOUND IC2001 Sound Control H-BoardAVSW-V IC3007 Audio input Switch H-BoardAVSW-A IC3001 Video input Switch H-BoardADV IC4005 A/D Converter DG-BoardGC4PRO IC4054 Video Processor (GC4PRO) DG-BoardGC4L IC4057 Video Processor (GC4L) DG-BoardHDMI IC5003 HDMI I/F DV-Board9TC-32LX50 / TC-26LX50