Hp/Spk Amp Circuit Diagram - LG DP471B Service Manual

3. HP/SPK AMP CIRCUIT DIAGRAM

+5V_AUD
L81 0/J/0603
C278 C281 C286 C334
0.1U/25V/0402
GNDA GNDA
Power ON / OFF Mute
+3.3V_SYS
TP91
Reset
TC1 R239
47U/10V/B 10K/J/0402
R236
100/J/0402
Q33
B
D13 R237 PMBS3904
1N4148
49.9K/F/0402
GNDA
R286 0/J/0402
6019_RIN R82 0/J/0402
GNDA
6019_LIN R81 0/J/0402
R287 0/J/0402
GNDA
6019_RIN
OP_OUT_L
6019_LIN
OP_OUT_R
C347
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
R288 0/F/1206
L100
NC/10UH/1.49A/D63CB
EC8
EC13 C367 C368 C369 C370 L102
+
L95
0/J/0603
GND_DC GNDA GND_DC GND_DC
GNDA
SYS_MUTE
SYS_MUTE (14)
D15
1N4148
A K
IO_MUTE (19)
L:MUTE F/W control
H:ACTIVE
C302
NC
U12
EUA6019
1
GNDA
PGND1
SPK_R-
2
SPK_R-
ROUT-
3
+5V_AUD
PVDD1
C287 1U/16V/0603 RHPIN
4
RHPIN
C100 33N/16V/0603 RLINEIN
5
RLINEIN
C288 33N/16V/0402
6
RIN
7
+5V_AUD VDD
C289 33N/16V/0402
8
LIN
C99 33N/16V/0603 LLINEIN
9
LLINEIN
C290 1U/16V/0603 LHPIN
10
LHPIN
11
+5V_AUD
PVDD2
SPK_L-
12
SPK_L-
LOUT-
SW2
VR/50K/5PIN
R281 0/J/0603 VR_Rout
1
1
R282 0/J/0603
2
2
R283 0/J/0603 VR_Lout
3
3
R284 0/J/0603
4
4
5
5
C348 C349 C350
NC NC
GNDA
+5V_V
NC/10UH/1.5A/DS75LC
+5V_SYS_A
EC1
220U/6.3V/6.3*5.3/S
HP-ROUT
R126
1K/F/0402
GNDA
GNDA
24
ROUT+
23
SE/BTL
22
HP/ LINE
VOL
21
VOLUME
Headphone and speaker difference
20
SEDIFF
Headphone max volume
19
SEMAX
(500ms Fade On)
18
AGND
1U/16V/0603
17
BYPASS
16
GNDA
FADE
SYS_MUTE
15
SHOTDOWN
L:MUTE
14
LOUT+
SPK_L+
13
H:ACTIVE
PGND2
EC2
220U/6.3V/6.3*5.3/S
C298
GNDA
+5V_AUD
R128
R267
1K/F/0402
47K/F/0402
VOL
GNDA
R270
100K/F/0402
GNDA
3-25 3-26
SPK_R+
HP_R_OUT
+5V_AUD
GNDA
Q26
R226 BAV70-F
100K/F/0603
K
HP1_DET
J
A
HP2_DET
R223 100K/F/0402
GNDA
R234 100K/F/0402
+5V_AUD
R230 NC
SPK_L+
HP_L_OUT
LGE Internal Use Only