Chapter 9. Trouble shooting
9-1. Simple check
No picture/ No sound
Verify if the television is properly plugged
Verify if the television is properly supplied power
Verify if electricity is available.
Blank screen
Verify if correct signals are input
Press INPUT button to change signal input to TV input
Restart the television of power supply is interrupted
No sound
Press Mute button and verify if Mute mode is set.
Switch to otger channel and verify if the same problem
happens.
Press VOL+ button to see of he problem can be solved.
Poor sound
Verufy if sound system is correct .Refer to some chapter for
adjust.
No picture in some channel
Verify if correct channel is selected.
Adjust the antenna.
Make adjustments by Fine Tune and MANUAL Scan.
No color for some channel program
(black and white)
Verify if the same problem exists in other channels.
check out of picture and sound system.
Refer to relative instructions in the Manual for color adjust.
Spots with some or all pictures
Verify if the antennal is correctly connected.
Verify if the antennal is in good condition.
Make fine adjustment of channel.
Horizontal/ vertical bars or picture
shaking
Check for local interference such as an electrical appliance
or power tool.
Television out of control
Disconnect the television from power supply and 10
seconds later, connect the television to the power supply.
If the problem still exists, contact authorized after-sales
service for technical assistance.
Service Manual
Model No.: LET40T3
49
