Philips PET940 Service Manual page 24

8.0 ELECTRICAL DIAGRAM
IF BOARD CIRCUIT DIAGRAM
2 2
1 1 3 3
BAT54S
TFT5V
L20 10uH/2.3A L20 10uH/2.3A
U1 U1
C9 C9 + + MP1540 MP1540
22UF/16V 22UF/16V
5 1
IN SW
R18 R18 100K 100K
4
EN
3
FB
2
GND
R16 R16
TFT3V3
FB FB
L11 L11 VR1 VR1 R1 R1
5K1 5K1
5K 5K
C48、C54 C48、C54 + +
10uF 10uF R10 R10
6K8 6K8
VX VX
VX
VCOM
+ + C47 C47 R42 R42
5.6k 5.6k
10uF 10uF
VGH
+12V_VOP
L13 33uH L13 33uH
+12V_VOP
C20 C20 C57 C57
C58 C58 C59 C59
+ + + + + +
0.1uF 0.1uF
10uF/16v 10uF/16v 16uF/16v 16uF/16v 0.1uF 0.1uF
CB1 CB1
100UF/16v 100UF/16v
L6 L6 2.7uH 2.7uH
89P_R R_IN
C24 C24 C27 C27
R13 R13
75R/1% 75R/1% 100pF 100pF 100pF 100pF
AMP_VDD V_BIAS
R22 R22 R26 R26 R27 R27
20k 20k 470R 470R 1M 1M
CE6 CE6
Vdc ROUT
CE3 CE3
10uF/16v 10uF/16v
R_IN
1
VD4 VD4
2412 2412
10uF/16v 10uF/16v
R19 R19 R25 R25 R28 R28
7.5k 7.5k 75R 75R 750K 750K
VD7 709 VD7 709
C49 C49
1 2 3
0.1uF 0.1uF
2
C2 C2 R37 R37 R38 R38
3 CE7 CE7 0.1uF 0.1uF 4.7K 4.7K
39K 39K
10uF/25V 10uF/25V VD8 VD8 C14 C14
709 709
VD6 VD6 C52 C52
1
SMD BAT54S SMD BAT54S 0.22uF 0.22uF 22UF/25V 22UF/25V
R39 R39
2.7K 2.7K
D1 D1 1N5819HW 1N5819HW L21 L21 10uH 10uH
VGH
1 2
VGH
+15V
+C51 、C11 +C51 、C11
C50 C50 +C1 +C1 C37 C37
R17 R17 0.1uF 0.1uF 10uF/25V 10uF/25V 22uF/25V 22uF/25V 0.1uF 0.1uF
110K 110K
R12 R12
100K 100K
10K 10K
C55 C55 15pF 15pF 89P VCOM DAC OUTPUT
R44 R44 150k 150k
-12V_VOP
N4A N4A
R43 R43 51K 51K 2
VCOM
1
R41 R41 0 0 3
C56 C56
NJM4558 OPA NJM4558 OPA 22pF 22pF
C3 Closed to HA2
+12V_VOP
VCOM DAC OP POWER
VGL
L14 L14 33uH 33uH
-12V_VOP
-12V_VOP
C61 C61 C15 C15 C60 C60 C62 C62
10UF/16V 10UF/16V 0.1uF 0.1uF 10uF/16v 10uF/16v 0.1uF 0.1uF
L7 L7 2.7uH 2.7uH
89P_B B_IN
C25 C25 C28 C28
R14 R14
75R/1% 75R/1% 100pF 100pF 100pF 100pF
AMP_VDD V_BIAS
R23 R23 R33 R33 R35 R35
20k 20k 470R 470R 1M 1M
CE5 CE5
Vdc BOUT
CE2 CE2
10uF/16v 10uF/16v
B_IN
1
VD3 VD3
2412 2412
10uF/16v 10uF/16v
R20 R20 R29 R29 R31 R31
7.5k 7.5k 75R 75R 750K 750K
L22 10uH L22 10uH
-10V
VGL
VGL
C3 C3 C6 C6
CE8 CE8 0.1uF 0.1uF 0.1uF 0.1uF
10UF/25V 10UF/25V
C5 C5
22uF/25V 22uF/25V
+5V
L12 L12 33UH 33UH
C8 C8 + + C7 C7
C36 C36
+ +
100N 100N 22uF16v 22uF16v
22uF/16v 22uF/16v
3V3
GNDV FB FB L15 L15 GND L4 L4 FB FB
FB FB L16 L16 C18 C18
+ + C17 C17
FB FB L18 L18 100N 100N
22uF16v 22uF16v
FB FB L17 L17
N4B N4B
6
7
5
NJM4558 OPA NJM4558 OPA
R5 R5
C16 C16
C4 Closed to HA2
10pF 10pF
L5 L5
+5V
BJT Amplifier for RGB Video
L8 L8 2.7uH 2.7uH
89P_G G_IN
C26 C26 C14 C14
R15 R15
75R/1% 75R/1% 100pF 100pF 100pF 100pF
AMP_VDD V_BIAS
R24 R24 R34 R34 R32 R32
20k 20k 470R 470R 1M 1M
CE4 CE4
Vdc GOUT
CE1 CE1
10uF/16v 10uF/16v
G_IN
1
VD5 VD5
2412 2412
10uF/16v 10uF/16v
R21 R21 R30 R30 R36 R36
7.5k 7.5k 75R 75R 750K 750K
J1 J1
3V3
1
GND
2
VCOM
3
GND
4
R
5
GND 6
B
7
GND 8
G
9
GND 10
CPH1
11
STHL 12
OEH
13
OEV
14
CKV
15
STVL
16
GND
17
SPL+
18
SPL-
19
SPR-
20
TFT5V SPR+
21
TFT5V
+5V GND
22
+5V
23
C12 C12 +5V
24
100UF/16V 100UF/16V
+ + C21 C21 + + C31 C31 C32 C32 24x1 24x1
22uF/16V 22uF/16V 22uF/16V 22uF/16V 100N 100N
TFT3V3
C19 C19 C41 C41
100N 100N 100N 100N
TFT3V3 XS2 XS2
1
26
GND
2
25
VCC
VGL 3
24
VGL
TP1 TP1 VGH
23 4
VGH
STVR 5
22
STVR
STVL
21 6
STVL
R11 R11 10K 10K CKV 7
20
CKV
UND 8
19
U/D
OEV 9
18
OEV
VCOM VCOM VCOM VCOM 10
17
VCOM
R9 10K R9 10K 11
16
VCOM
10K 10K LNR 12
15
LR
MOD 13
14
MOD
OEH 14
13
OEH
STHL 12 15
STHL
STHR 16
11
TP2 TP2
STHR
10 17
CPH3
18
9
CPH2
CPH1 8 19
CPH1
20
7
VCC
R8 0 R8 0 C38 C38 C45 C45 C46 C46 6 21
GND
R7 0 R7 0 ROUT 22
5
VR
GOUT 23
R6 0 R6 0 22P 22P 22P 22P 22P 22P 4
VG
FB FB BOUT 24
3
VB
25
2
AVDD
26
1
AVSS
+ + C23 C23 C10 C10 C22 C22
HEADER 26 SMD0.5 BOTTOM HEADER 26 SMD0.5 BOTTOM
22uF/16v 22uF/16v 100nF 100nF 100nF 100nF
+5V
V_BIAS
L10 L10 FB FB V_BIAS
+ + C39 C39 C42 C42 C30 C30 C44 C44 C43 C43
10uF/16V 10uF/16V 0.1uF 0.1uF 22pF 22pF 22pF 22pF 22pF 22pF
+5V
L9 L9 FB FB
AMP_VDD
+ + C33 C33 C35 C35
22uF/16v 22uF/16v 0.1uF 0.1uF
GND
GND
VCC
VGL
VGH
STVR
STVL
CKV
U/D
OEV
VCOM
VCOM
L/R
MOD
OEH
STHL
STHR
CPH3
CPH2
CPH1
VCC
GND
VR
VG
VB
AVDD
AVSS