LG 42LV5500 Training Presentation page 64

Audio Amplification for Speakers Information
IC1702 VOLTAGES
3.3V_AU_AVDD pin 13
3.3V_DVDD pin 27
All made from
3.3V Normal _
Right Channel:
24V pin 34, 35 (R-)
24V pin 40, 41 (R+)
Left Channel:
24V pin 44, 45 (L-)
24V pin 2, 3 (L+)
Use speaker out to test for defective Audio Amp IC1702
Note: (Normal, ½ Audio B+) 12.2V on each pin. Note: (Normal ½ Audio B+) 12 2V on each pin
R-
R+
L-
L+
Amp _Reset pin 25
Q1701 Back side of the board is (Mute) Active Low.
3.3V_ST Collector to AMP_MUTE_PDN Pin 19
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IC1702
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May 201 1 LCD TV 42LV5500