LG KU380 Service Manual page 111

4. TROUBLE SHOOTING
Analog Switch
Audio Amp
O
SELECT_SPK&RCV
+VPWR
C415 SPK-
0.01u
SPK_RCV-
R414 39
RCV-
SPK_AMP_EN : 2.6V
SPK_AMP_EN
R418 1K
LINE_N
R420 1K
LINE_P
LGE Internal Use Only
SPK_AMP_EN
R419 C427
U401
NLAS5223BMNR2G
1 10
VCC NO2 SPK+
2 9
SPK_RCV+
NO1 COM2
3 8
COM1 IN2 RCV_EN_N
39 R413
4 7
RCV+
IN1 NC2
5 6
NC1 GND
Audio AMP
1
R417
2
20K
C427 0.1u R419
5.6K 3
C428 0.1u
R421 5.6K 4
R422
20K
R421
C428
R420
R418
SPK_RCV-
SPK_RCV+
REV_B
NCP2890DMR2
8
_SD OUTB
7
U402
BYPASS VM
6
VP
INP
5
INM OUTA
C432
1u
C429
10u
Copyright © 2007 LG Electronics. Inc. All right reserved.
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Speaker
VIBRATOR PAD
L101 56nH
L102 56nH
SPK-
+VPWR
SPK+
Only for training and service purposes
RCVN
RCVP