No power No audio Speaker checking method Remote control operation check.
B power error - No powerCheck the front standby display.
Front LED control: Menu > option > power indicator > standby light ON.
Standby condition – red
Power On condition – white
For 11 models, there is no voltage out for standby purpose. When standby, only 3.5 volt is normally
ON
Service
mode entry method
You
should have the service remote control of LG; to go further.
It can be bought from the authorized service centre for LG.
Press
the In-Start button of the remote
controller for adjustment
Check
the entry into adjustment item 3.
Checking method in menu, when there is no audio.
Press the menu button on the remote controller
Select audio function of the menu.
Select speaker from off to on.
Voltage and speaker checking method when there is no audio.
Check the contact condition of 20V or 24V connector of the main board. Measure the 24V input voltage supplied from the power board. If there is no input voltage, remove and check the connector.
Connect the tester RX1 to speaker terminal and if you hear the Chick Chick sound when you touch the Ground and output terminal, the speaker is normal.
Remote
controller operation method
1,2
Check the IR cable condition between IR and the main board.
3
check the standby 3.3V on terminal s.
4.
when checking the pre-amp when the power is ON condition, it is normal when the analog tester needle moves
slowly, and defective when it does not move at all.
