Audio Amp(Ti); Headphone Block - LG 28LB45 series Service Manual

AUDIO AMP(TI)

R3453
0
Separate DGND AND AVSS
+3.3V_ST
OPT
R3450
10K
R3454
10K
R3455
C
R3451
100
10K
B Q3450
AMP_MUTE
MMBT3904(NXP)
OPT E
R3452
10K

Headphone block

+3.3V_Normal
Head Phone
R3400
47K
Head Phone
R3412
1K
VA3401
20V
OPT
6 M6
JP3400
1 M1 JP3406
3 M3_DETECT
JP3405
VA3400
4 M4
JP3407 20V
VA3402
5 M5_GND
20V
KJA-PH-1-0177-2
JK3400
Head Phone
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
This parts are Located
on AVSS area.
50V
C3455 4700pF
C3454
R3458
25V 470
0.047uF
+3.3V_Normal
AVDD
C3451 R3457 2K A_SEL_FAULT
0.1uF
MCLK
16V
18K
OSC_RES
1% DVSSO
R3456
VR_DIG
AUD_MASTER_CLK
LRCLK
C3450
SCLK
1000pF
C3453
50V 0.1uF SDIN
16V
AUD_LRCK
AUD_SCK
AUD_LRCH
R3464
AMP_SDA
0 R3465
AMP_SCL
0
AMP_RESET
+3.3V_Normal
C3452
0.1uF
16V
HP_DET
OPT
Q3402
C
E
MMBT3904(NXP) OPT
B Q3404
MMBT3904(NXP)
B
E
C
C
OPT
E
OPT
Q3400
B Q3403
MMBT3904(NXP)
MMBT3904(NXP)
B
E
C
+19V
C3466
C3464
10uF
0.1uF
25V
50V
[EP]
PGND_AB_2
13 48
PGND_AB_1
47
14
OUT_B
46
15
NC_6
16 45 50V
NC_5 0.033uF
44
17
C3468
BST_B
43
18
PDN BST_C
19 42
NC_4
20 41
50V
NC_3
40
21 0.033uF
39 OUT_C C3469
22
SDA PGND_CD_2
23 38
SCL PGND_CD_1
37
24
+19V
C3460
0.1uF
16V
C3465 C3467
0.1uF 10uF
50V 25V
0.033uF
C3463
50V
C3456
0.1uF
16V
HP_LOUT
Head Phone
Head Phone
C3406
C3402
10uF
R3415 1000pF
10V
1K
50V
OPT
HP_ROUT
Head Phone
C3405
Head Phone
10uF
C3400
R3414
10V
1000pF
1K
50V
OPT
+3.3V_ST
OPT
Q3405
MMBT3906(NXP)
MUTE control
OPT
D3400
OPT
MMBD6100
C
OPT
R3416
R3417
B C
3.3K
10K
Q3406
E
MMBT3904(NXP)
OPT
COIL_GETPLUS COIL_GETPLUS COIL_GETPLUS COIL_GETPLUS
L3451-*1 L3453-*1 L3450-*1 L3452-*1
10.0uH 10.0uH 10.0uH 10.0uH
COIL_ABCO
L3451
10uH
R3460
18
C3470
330pF
C3476
50V
0.1uF
50V
C3474
0.47uF
50V
C3471
C3477
330pF
0.1uF
50V
50V
R3461
18
COIL_ABCO
L3453
10uH
COIL_ABCO
L3450
10uH
C3478
C3475
0.1uF
0.47uF
50V
50V
C3472
330pF
50V
C3479
0.1uF
50V
C3473
330pF
50V
COIL_ABCO
L3452
10uH
Dip Detection Circuit
+19V
OPT
AC KDS226
D3401
OPT OPT
C
R3418 A
R3420
47K
470
B
OPT
OPT
C3429 C3410
R3419
4.7uF 10uF
220K
50V
25V
OPT
85C 11.10.27
Apply->OPT
A2
SB_MUTE
A1
HP_MUTE
MA55
AMP_TAS5733/HP
Close to Speaker
SPK_L+
OPT
C3480
2200pF
50V
OPT
SPEAKER_L
C3481
2200pF
50V
SPK_L-
SPK_R+
SPEAKER_R
OPT
C3482
2200pF
50V
OPT
C3483
2200pF
50V
SPK_R-
P3401
WAFER-ANGLE
SPK_L+
4
SPK_L-
3
SPK_R+
2
SPK_R-
1
OPT
C3428
47uF
E
25V
OPT
105C
MMBT3906(NXP)
Q3407
3K:
With SCART MUTE BLOCK
C
OPT
R3421
12K:
12K
Without SCART MUTE BLOCK
SB_MUTE
OPT
R3422
12K
2013/05/23
34
LGE Internal Use Only