LG 55UB820T Service Manual page 36

THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
Copyright © 2014 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
EARPHONE AMP
C1401
C1400 HP_OUT HP_OUT
180pF
1uF R1400 R1402
10V 10K 43K
HP_ROUT_MAIN
HP_OUT
1%
R1401
33K
HP_ROUT_AMP
+3.3V_NORMAL
4.7K
R1403
HP_OUT
SIDE_HP_MUTE
IC1400
TPA6138A2
+INR +INL
1 14
C1407
180pF
HP_OUT HP_OUT
R1404 R1406
-INR -INL
43K 10K
2 13
HP_OUT
HP_OUT
HP_OUT
1%
C1403
C1405
R1405
10pF 10pF
OUTR OUTL
33K
50V 3 12
50V
GND_1 UVP
+3.3V_NORMAL
4 11
HP_OUT
MUTE GND_2
5 10
L1400
120-ohm
BLM18PG121SN1D
VSS VDD
6 9
HP_OUT
HP_OUT
HP_OUT
C1408
C1406
C1402 CN CP
1uF 0.1uF
7 8
1uF
16V
10V
10V
C1404
1uF
10V
HP_OUT
C1409
1uF
10V
HP_LOUT_MAIN
HP_OUT
HP_LOUT_AMP
UB83
HEADPHONE AMP
2013-10-28
14
LGE Internal Use Only