Audio Amplifier - Philips LC4.2E Service Manual

Circuit Diagrams and PWB Layouts
TV & Scaler Board: Audio Amplifier
1 2

AUDIO AMPLIFIER

A
F701
A3
AUDOUTLSL
For ITV Only
I705
2704
3708
SC2_L_MON_OUT
A2
33K
1u0
I707
2706 3709
SC2_R_MON_OUT
A2
1u0 33K
B
F702
A3
AUDOUTLSR
For ITV Only
+3V3STBY AUD-SUP
C
3719 3717
10K 10K
+3V3STBY
I720
11V2 3725
10K
7702-1
I715 7702-2
BC847BS
BC847BS
3V3
I716
3V2
3V3
A2
STANDBY
D
HP_DET_IN
A3
4703
A3
AUDOUTLSL
A3 HP_DET_R_DC
+3V3STBY
7706-1
14
74HC08PW
SOUND_ENABLE
A2 4708 1
F711
POWER_DOWN
A6
2
4709
E 7
7706-2
14
74HC08PW
4
3V3
5 3V3
3V3
7
7706-3
14
74HC08PW
9
F 3V3
10
3V2
7
7706-4
14
74HC08PW
12
F712
A2 EXT_MUTE
13
3V3
7
3139 123 5804.2
1 2
LC4.2E AA
3 4
I701
2702
3703
HPIC_LIN
10K
1u0
3705
RES
4701
*EMC *EMC
2739 2740
I706
470p 470p
2705 1u0
I704
3710
33K
4702
3712 2708
HPIC_RIN
2716
10u 16V
10K 1u0
3713
RES
2712
* 3714 I709 1u0
12K
3715
1K8
AUD-SUP
AUD-SUP
3722
8K2
+3V3STBY
+3V3STBY
3747
100K
I714
7703-1
4V5
11V2 BC847BS
7703-2
4V5
BC847BS
3748 I729
3749
3V3 3V3
10K
10K
3V3
3V3
F714
F715
I717 3726 I718 2718 I719
*
12K 1u0
3727
1K8
3
3V3
6 AUD-SUP
MUTE
3730
10K
I721
3731
ST_BY
8 0V
0V
470R
3732
0V7
7710
BC847BW
1K0
3733
470R
11
3V
3 4
7. 29
5 6
4704 RES
4705 RES
1701
* AV BUNDLE I730
+T
4R8
2701
7707
15 16 100n
TDA1517ATW
VP1 VP2
P-GND
I702
?
HPIC_LOUT
3 8
IN1+ OUT1A
9
I703 POWER
OUT1B
18
AMPLIFIER
IN2-
HPIC_ROUT
12
OUT2A
13
OUT2B
I710
17 1
MODE
2
I711
5 6
SVRR
7
NC
14
19
20
3720
PGND
10K
SGND 1 2 HS
4 10 11 21
F713
P-GND
I712
ITV 1W BATHROOM AMP
*EMC
2741
470p
AUD-SUP
2713 2719 2714
100n 100n 470u
3746 P-GND P-GND P-GND
100K
11V3
7709
3706
I723 I713
TDA7297D 15 6
10K
VCC
3750
14 19
IN1 OUT1+
68K
2703 1V4 5V8
10u 16V
16
? OUT1-
5V8
POWER
7 2
AMPLIFIER
IN2 OUT2+
1V4 5V9
5
OUT2-
*EMC 5V9
2742
12 18
ST_BY
470p
4V5 17
13 9
MUTE NC
4V5
4
3
PW GND
3744
SGND
8 20 11 10 1 21
I728
10K
MAIN AMP
2746
P-GND
3751
10V 1u0
68K
P-GND
HP_LOUT
0V8
7708-1
PUMH7
HP_ROUT
0V8
F701 F702 F705
7708-2
PUMH7
20mV / div AC 20mV / div AC 50mV
1ms / div 1ms / div
5 6
7 8
HPIC_LIN
HPIC_RIN
+3V3STBY
HEADPHONE AMP
I731
3740 22K
2743 1u0
3741
100K
7740-1
3739 22K 2
TS482IDT
1V7 1
I725 I732
2744 1u0
3
1V7
1V7
3745 100K
+3V3STBY
2745
I724 5
100u 16V
7
I737
6 1V7
3743 22K
1V7 7740-2
TS482IDT
3742 22K
2707 I726
3711
470u 16V 0R
** 4706
2710
470p
I727
2715
3718
470u 16V 0R
16V
** 4707
2711
470p
F705
F706
F707
F708
*EMC
*EMC *EMC
3735 3736 3737
2R2 2R2 2R2
I738 I739 I740
*EMC
*EMC *EMC
2735 2736 2737
1n0 1n0 1n0
F706 F707 F708
/ div AC 50mV / div AC 50mV / div AC 50mV / div AC F710
OUT_MUTE
1ms / div 1ms / div 1ms / div 1ms / div
7 8
9 1701 A6 7706-4 F2
1704 D9 7707 A5
2701 A6 7708-1 F5
2702 A4 7708-2 F5
2703 D5 7709 D6
2704 A2 7710 F4
2705 B3 7740-1 A9
2706 B2 7740-2 B9
2707 B7 F701 A1
2708 B3 F702 B1
2709 B5 F705 D9
A
2710 C8 F706 D9
HPIC_ROUT
2711 D8 F707 D9
2712 C3 F708 E9
2713 C6 F710 F9
2714 C7 F711 E1
2715 C7 F712 F1
2716 B4 F713 B6
HPIC_LOUT
2718 D4 F714 D4
2719 C6 F715 D3
2735 E8 I701 A3
2736 E9 I702 A5
2737 E9 I703 A5
2738 E9 I704 B4
2739 A4 I705 A2
B
2740 A5 I706 A2
2741 C5 I707 B2
2742 D5 I709 C3
2743 A8 I710 B5
2744 A8 I711 B5
2745 A8 I712 C5
2746 E6 I713 D5
A3
HP_ROUT
3703 A3 I714 D3
3705 A3 I715 D1
3706 D5 I716 D2
3708 A2 I717 D2
3709 B2 I718 D4
3710 B3 I719 D4
3711 B8 I720 C2
C
HP_LOUT A3 3712 B3 I721 F4
3713 B3 I723 D5
3714 C3 I724 A7
3715 C3 I725 A7
3717 C2 I726 B8
3718 C8 I727 C8
3719 C1 I728 E6
3720 B5 I729 D4
3722 C2 I730 A6
3725 C2 I731 A8
3726 D4 I732 A8
3727 D4 I737 A8
3730 F4 I738 E8
D
3731 F4 I739 E9
3732 F3 I740 E9
3733 F3 I741 E9
1704
3735 E8
+
4
3736 E9
R
-
3
3737 E9
+
2
3738 E9
- L
1
3739 A8
3740 A8
3741 A8
3742 B9
*EMC
3738
3743 B8
2R2
3744 E5
E
3745 A8
3746 C5
I741
3747 D3
*EMC
3748 D4
2738
3749 D3
1n0
3750 D5
3751 E5
4701 A4
4702 B4
4703 D2
4704 A5
4705 A5
4706 B8
4707 C8
F
4708 E1
4709 E2
7702-1 D2
7702-2 D2
7703-1 D4
A2 / A3
7703-2 D3
7706-1 E2
7706-2 E2
E_14490_030.eps
7706-3 F2
030604
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