Philips LC4.31E Service Manual page 54

Circuit Diagrams and PWB Layouts
SSB .2: DC-DC Converter
1 2
DC-DC CONVERTER
B6
A
+5V
F701
+12VSW +12VSW
2704
10u 16V
B
+12VSW
3718
2719
100n 10R
C
I714
7710
L6910
I711
2717 100n
1 VREF
Monitor
I712
2718
100n
4 SS
Protection & Ref
2 OSC
OSC
D
SIG_GND2
8
EAREF
2702
100n
SIG_GND2
E
FOR 37"-50" LARGE SCREEN I722
SUPPLY TO TUNER & HERCULES
+12VSW 5730
I731
10u
7730
L5973D
2730
22u 16V VCC
3
F INH
SUP_GND1
2
SYNC
SUP_GND1
GND GND_HS
G
7738
5738
+12VSW I702 L78M08CDT
1
IN OUT
3
120R
2738 COM 2739 +3V3STBY
47u 16V 47u 16V
2
+12VSW 6740
I740 3740 I741
7741
BC847BW
PDZ8.2-B 1K5
3741 2741
H
1K5 220n
FOR 37"-50" LARGE SCREEN
3139 123 6117.2
1 2
LC4.31E AA
3 4 5
I706
5704
7708
2706 LF33CPT
10u 16V
I709
1 5
IN OUT
I708
2 4
CTRL NC NC
COM
2709
3709 2708
47u 16V
6K8 RES
5709
I710
10u
2710 2711
22u 16V 22u
16V
SUP_GND2 SUP_GND2
2720
3719
680R 1n0
2724
1n0
I715
I724
7711-1 2725
2 SI4922DY 1n0
I717
BOOT 12 2721 100n
I716
3701
HGATE 11 3720 2R2
3723
I719 10K
I718
PHASE 10 10R
7711-2
SI4922DY
LGATE 14 3721 2R2 4
I720
I721 3702 SUP_GND2
PGND 13
10K
F717
GND 7
SIG_GND2
I723
VFB 6
2722
3722
1n0 2K7
2723 47n
I762 3734
100R
6
8 6734
Φ
VREF
1
6735
OUT
BAV99
I733
5
FB
7735
I705
I735
4 2N7002
COMP
2734
2733
22n
9 220p I734
7 2735
680p
I701
6733
SUP_GND1
5733 3735
SS14
3736 33u 1K0
4K7 SUP_GND1 SUP_GND1
5735
SUP_GND1
SUP_GND1
100u
SUP_GND1
SUP_GND1
3732 5737
3K3 I736
3733
SUP_GND1 1%
10u
I732
1K0 1%
3743
22K
3742
15K 2731
I742
470u 16V
7742
BC847BW
SUP_GND1
3 4 5
7. EN 54
6 7 8
FOR 26"-42" SCREEN
F710 +3V3STBY
2716
16V
470u
5717 I725 5713
FROM SCALER
7755
PDTC114ET
10u 3u3
PANEL-PWR-CTL
F755
SUPPLY TO SCALER
5752
+12VSW
10u
2753
22u 16V
SUP_GND2
GND
2763
22n
3727
1%
1K0
SIG_GND2
3737
4K7
SUP_GND3
32V9
F736 +VTUN
TO TUNER CELL
2736
22u
35V 6736
BZX384-C33
SUP_GND1
FROM HERCULES
SUP_GND1
TO HERCULES CELL
3759
12K
0V
+5VSW SC_STANDBY
5V2 F737
7756
3V1 PDTC114ET
+8VSW_TV
F738
8V
F743
POWER_DOWN
B5
2737
470u 16V
B7
B16
6 7 8
9 10
+12VSW
5756
SS = 4V9
7754 5757
PAN_VCC 5700
I757
I756
SI2301BDS-T1-E3
2 3
11V5
120R 120R
RES
2749 3755 2751
2752 2700
10K 4u7 47u 16V
1 RES
6V8
I747
3758
15K 3760
100R
I760
2760
1u0
(0V)
25V
0V6
RES
I764
RES
7752
L5970D
8 1 I755
VCC OUT
SUP_GND3
I758
4 5
COMP FB
6751
5753
2756
3 2 220u SS14
INH SYNC
220p
7 6
GND VREF
SUP_GND3 SUP_GND3
SUP_GND3
TO SCALER CELL
3753 3754 I754 5754 F754 +5VSWI
I753
10u 5V4
1K0 1% 1V2 3K3 1%
SUP_GND3
2757 2758
470u 16V 470u
+3V3STBY
3V2
RES
SUP_GND3
2750
3750 2762
22K 22u 16V
7758
4
SI4423DY
I748
+3V3SW
3V2
3761
100R
2759
I704
100u 16V
2761
1u0
25V
RES 5751
10u
9 10
11
2700 B11 6736 F6
2701 B11 6740 H1
2702 D1 6751 E10
B6
2704 B2 7708 A5
2706 A3 7710 C2
2708 B4 7711-1 C4
2709 B4 7711-2 D4
A
2710 B4 7730 F2
2711 B4 7735 F5
2716 B7 7738 G2
2717 D1 7741 H3
2718 D1 7742 H3
2719 C2 7752 D9
2720 C3 7754 B9
2721 D4 7755 C8
2722 E4 7756 G8
2723 E4 7758 G9
2724 C5 F700 B11
TO PACIFIC3
2725 C5 F701 B2
B
LVDS_VCC 2726 C5 F710 B6
F700
2727 D6 F717 D3
11V5 2730 F2 F736 F6
2731 H5 F737 G6
2701
100p
2733 F4 F738 G6
2734 F3 F743 G6
2735 F5 F754 F11
2736 F6 F755 C8
2737 H6 I701 F3
2738 G1 I702 G1
2739 G2 I704 G8
C 2741 H2 I705 F3
2749 B8 I706 A3
2750 F9 I708 B4
2751 B9 I709 B4
2752 B10 I710 B3
2753 D8 I711 D2
2756 E8 I712 D2
2757 F10 I714 C2
2758 F11 I715 C3
2759 G10 I716 D3
2760 C9 I717 D4
2761 G9 I718 D3
D
2762 G9 I719 D4
2763 E8 I720 D3
3701 D4 I721 D4
3702 D4 I722 E2
3709 B4 I723 E4
3718 C2 I724 C5
3719 C3 I725 C6
3720 D4 I726 C6
3721 D3 I731 E2
3722 E4 I732 G4
3723 D5 I733 F4
3724 C6 I734 F4
E
3725 C6 I735 F5
3726 C6 I736 G5
3727 E6 I740 H1
3732 G3 I741 H2
3733 G4 I742 H3
3734 E4 I747 B9
3735 G5 I748 G8
3736 G3 I753 F9
TO LIPSYNC
3737 E8 I754 F10
3740 H2 I755 D10
3741 H2 I756 B9
F 3742 H3 I757 B9
3743 G3 I758 E8
16V 3750 G8 I760 C8
3753 F9 I762 E4
3754 F10 I764 D8
3755 B9
3758 C8
3759 G8
3760 C9
3761 G9
5700 B11
5704 A3
G
5709 B3
5713 C6
5717 C5
5730 E2
5733 G4
5735 G5
5737 G5
5738 G1
5751 H10
5752 D8
5753 E10
5754 F10
H
5756 B9
5757 B10
6717 C3
6718 C5
6733 G4
G_16210_006.eps
6734 F4
160106
6735 F5
11