Philips LC4.9E Service Manual page 91

Circuit Diagrams and PWB Layouts
SSB: DC-DC Converter
1 2
DC-DC CONVERTER
B6
A
FROM TOP CONNECTORS
+12VUNREG
2704
10u
+5V
B
3708 10K
+12VUNREG
6709
6708 3709 2708
SS14
SS24 6K8 RES
C
I710
5709
10u 7710
I711
L5973D
VCC
2710 2711
10u 10u 3
INH
2
SYNC
NC
SUP_GND2 SUP_GND2
GND GND_HS
D SUP_GND2
SUP_GND2
FOR UFD ONLY
SUPPLY TO TUNER & HERCULES
E
+12VSW 5730
I731
10u
I705
2730
2734
10u
22n
25V
2733
220p
3736
F
4K7
SUP_GND1
SUP_GND1
SUP_GND1 SUP_GND1
7738
+12VSW 5738 L78M08CDT
1
IN OUT
3
COM 2739 +3V3STBY
2738
47u 16V 47u 16V
2
G
+12VUNREG 6740
I740 3740 I741
BZX384-C8V2 1K5
3741 2741
1K5 220n
FOR UFD ONLY
3139 123 6141.1
1 2
LC4.9E AB
3 4 5
F701
+12VSW
16V
I706
2706 5704
10u 16V
7708
LF33CPT
I709
1 5
IN OUT
I708
2 4
CTRL NC NC
COM
2709
47u 16V
NC
Φ
VREF
5712 5713
I712 I713
1
OUT
33u 10u
I714
3712
5
FB
5K6
2715 1%
I715 I716
4
COMP
22n
6712 2714 3716 3713 2713
16V
SS36 220p 4K7 3K3 470u
1%
SUP_GND2
SUP_GND2 SUP_GND2 SUP_GND2 SUP_GND2
SUP_GND2
7730
L5970D
BAV99
8 I733
1
VCC OUT
I735
4 5 7735
COMP FB BC817-25
3 2
INH SYNC
7 I734
6
GND VREF
6733
5733 3735
SS14
220u 1K0
SUP_GND1 SUP_GND1
5735
SUP_GND1
1m0
SUP_GND1
SUP_GND1
3732 5737
3733 3K3 I736
SUP_GND1 1% 10u
1K0 1% I732
3743
22K
3742
15K
2731
I742
470u 16V
7742
BC847BW
7741
BC847BW
SUP_GND1
3 4 5
7. 91
6 7 8
FOR LCD ONLY
+3V3STBY
+5VSWI
5758
RES
2749
10u
3758
15K
FROM SCALER 7755
I760
F710 +3V3STBY
PDTC114ET
PANEL-PWR-CTL
(0V)
F755
0V6
SUPPLY TO SCALER
2716
470u 16V
+12VSW
I751
3751 3752
5752
1R0 1R0
10u
I752
32V9
F736 +VTUN
2753
3753 I753
470u 16V
TO TUNER CELL
6735 2736 1K0 1%
22u
35V 6736
2754
BZX384-C33
GND SUP_GND3
RES
SUP_GND3
2735
470p
SUP_GND1
SUP_GND1
TO HERCULES CELL
FROM HERCULES
3759
+5VSW
5V2 F737
1K0
0V
+8VSW_TV
8V F738
SC_STANDBY
F743 7756
POWER_DOWN
3V1 PDTC114ET
B5
2737
470u 16V
B7
B16
6 7 8
9 10
I757
7 6
5
+12VSW
4
I749
3
2
1
5755 5756 I750
1751
RES
RES
7754
5757
I756 SI2301BDS-T1-E3
2 3
11V5
3755 2751
5759 7753
10K 100n
1 RES L4940D2T12
I747 6V8
PAN_VCC
5700 F700
I759
1 3
IN OUT
3760
COM
100R
2759
RES 2752 2700 2701
100p
47u 16V
RES RES
2760
1u0
25V
FOR UFD ONLY
7752
MC34063AD
8 DCOL SWC 1
11V7
S Q
R
3734
7 IS 2K2
11V7
I755
SWE 2
IPK
I758
TIMC 3
OSC
2756 6751
5753
REFERENCE
470p SS14
6 220u
VCC REGULATOR
11V7
SUP_GND3
CIN_NEG GND 4
5
SUP_GND3
1V2 TO SCALER CELL
SUP_GND3
3754 I754 5754 F754
+5VSWI
10u 5V4
3K3 1%
2757 2758
2755
+3V3STBY
470u 16V 470u
4n7
3V2
SUP_GND3
2750
2u2
3750 2762
22K 22u16V
7758
4
SI9433BDY-T1-E3
I748 SI4433DY
+3V3SW
3V2
3761
100R
2761
1u0
25V
FOR UFD ONLY
9 10
11
1751 A10 7752 D8
2700 B10 7753 B9
B6
2701 B11 7754 B9
2704 A3 7755 B8
2706 B3 7756 G8
2708 C3 7758 F9
2709 C3 F700 B11
2710 C2 F701 A3
2711 C2 F710 B5
2713 D5 F736 E6
2714 D4 F737 F6
2715 D4 F738 G6
A
2716 D6 F743 G6
2730 F2 F754 E11
2731 G5 F755 C8
2733 F2 I705 E3
2734 F3 I706 B3
2735 F5 I708 C3
2736 E6 I709 B3
2737 G6 I710 C2
2738 G1 I711 C2
2739 G2 I712 C3
TO EPLD
2741 G2
I713 C4
B 2749 B8 I714 D3
LVDS_VCC
2750 F9 I715 D3
2751 B8 I716 D4
11V5
2752 B10 I731 E2
2753 E7 I732 G4
2754 E8 I733 E4
2755 F8 I734 F5
2756 E10 I735 E5
2757 F10 I736 F5
2758 F11 I740 G1
2759 B9 I741 G2
2760 C9 I742 G3
C
2761 G9 I747 B9
2762 F9 I748 F8
3708 C2 I749 A10
3709 C2 I750 A10
3712 D5 I751 D8
3713 D5 I752 E8
3716 D4 I753 E8
3732 F4 I754 E9
3733 F4 I755 D10
3734 D10 I756 B8
3735 F5 I757 A9
3736 F3 I758 E10
D
3740 G2 I759 B9
3741 G2 I760 B8
3742 G3
3743 G3
3750 F8
3751 E8
3752 E8
3753 E8
3754 E8
3755 B8
3758 B8
E
3759 F8
3760 B9
3761 G9
TO LIPSYNC
5700 B10
5704 B3
5709 C2
5712 C4
5713 C5
5730 E2
16V
5733 F4
5735 F5
5737 F5
F
5738 G1
5752 E7
5753 E10
5754 E10
5755 A8
5756 A8
5757 B9
5758 A8
5759 B9
6708 C2
6709 C2
6712 D4
G
6733 F5
6735 E5
6736 E6
6740 G1
6751 E10
7708 B4
7710 C3
7730 E3
7735 E5
G_15351_006.eps
7738 F2
080906 7741 G3
7742 G4
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