Read LG 42LT560C / 42LT560E (CHASSIS:LA2AC) Service Manual online
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12. External Speaker Out
(1) Connect external speaker to speaker out port with phone jack on TV side as below
(2) Check the Max. speaker output is 1W or not. Sine wave with 1KHz will be displayed
(3) Check Both of the signal in speaker.
(Power only mode -> Fived 1W Default)
-> Check the input signal(1KHZ, Sine wave) and the wave of output by utilizing oscilloscope.
Recommended Input Signal
: RF, 1kHz, Sine wave
: RF, 1kHz, Sine wave
*
must remove Ground pin in plug
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