28
4. Sound problem
No sound or sound abnormal
Check the TV is muted, adjust the
volume or enter the menu to reset?
Reinsert the audio cable or
change the TV system
Replace the cable
Replace the speaker
Replace the main board
No
Yes
No
Check the cable between the
speakers and main board is ok?
Check the speaker resistance value is in spec
(Remark: The value is marked on the speaker)?
Check the audio source connection
and the TV system are correct
?
Yes
No
No
Yes
Summary of Contents for LT42A1
Page 31: ...31 6 PCB Layout 6 1 Main Board 715G3431 1 ...
Page 32: ...32 ...
Page 33: ...33 6 2 Power Board 715G3351 1 ...
Page 34: ...34 ...
Page 35: ...35 ...
Page 36: ...36 715G3358 2 ...
Page 37: ...37 6 3 Key Board 715G3293K01001004S 6 4 IR Board 715G3478R01002004M ...
Page 39: ...39 8 Block Diagram ...
Page 63: ...63 10 Exploded View ...