Philips PET740 Service Manual page 23

8.0 ELECTRICAL DIAGRAM
IF BOARD CIRCUIT DIAGRAM
2 2 C45 C45
0.1uF 0.1uF
1 3
1 3 2
BAT54S
VCC_TFT
L11 10uH/2.3A L11 10uH/2.3A D1 D1 1N5819HW 1N5819HW
1 2
U1 U1
MP1540 MP1540
C9 C9 + +
5 1
IN SW
10uF/16V 10uF/16V
R8 R8 100K 100K
4
EN
3
FB
2
GND
R10 R10 100K 100K
TFT3V3
601 601
R7 R7
L20 L20 VR1 VR1
5K 5K
8K2 8K2
R1 R1
3K9 3K9
VX VX R43 R43 47k 47k
VX
VCOM R41 R41 0 0
C48 C48 C54 C54 R42 R42
+ + + +
5.6k 5.6k
10uF 10uF 10uF 10uF
VCOM DAC OP POWER
VGH VGL
+12V_VOP
R3 R3 100 100 +12V_VOP R2 R2 100 100 -12V_VOP
C2 C2
+ + + + CE14 CE14 + + CE13 CE13 C59 C59 CE12 CE12 CE11 CE11
47uF/16v 47uF/16v 16uF/16v 16uF/16v 16uF/16v 16uF/16v 0.1uF 0.1uF 10uF/16v 10uF/16v 10uF/16v 10uF/16v
L6 L6 2.7uH 2.7uH
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
ROUT
Vdc
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 L2 L2 33UH 33UH
1 2 3
VD6 VD6
SMD BAT54S SMD BAT54S
CE8 CE8 R17 R17 R37 R37
3 10uF/25V 10uF/25V 4.7K 4.7K
39K 39K
VD8 VD8 CE9 CE9 C14 C14
709 709 10uF/25V 10uF/25V 22uF/25V 22uF/25V
C46 C46 1
0.22uF 0.22uF
R18 R18
2.7K 2.7K
L1 L1 33UH 33UH
VGH
VGH
+15V
+CE7 +CE7 +C1 +C1 C37 C37
R16 R16 10uF/25V 10uF/25V 22uF/25V 22uF/25V 0.1uF 0.1uF
110K 110K
GNDV
R12 R12
10K 10K
C55 C55 15pF 15pF
89P VCOM DAC OUTPUT
R44 R44 120k 120k
-12V_VOP
N4A N4A
2
VCOM
1 6
3
C56 C56
5
NJM4558 OPA NJM4558 OPA 22pF 22pF
C3 Closed to HA2
+12V_VOP
-12V_VOP
C62 C62
0.1uF 0.1uF
L7 L7 2.7uH 2.7uH
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
BOUT
Vdc
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
-10V
VGL
VGL
C34 C34
0.1uF 0.1uF
+5V
L12 L12 33UH 33UH VCC_TFT
+ + C36 C36 C8 C8
22uF/16v 22uF/16v 100N 100N
3V3
GND
FB FB L15 L15 L4 L4 FB FB
FB FB L16 L16 C18 C18
+ + C17 C17 C19 C19 C41 C41
FB FB L18 L18 100N 100N
22uF16v 22uF16v 100N 100N 100N 100N
FB FB L17 L17
N4B N4B
7
NJM4558 OPA NJM4558 OPA
R11 R11
R5 R5 10k 10k
C16 C16
C4 Closed to HA2
10pF 10pF R6 75 R6 75
CPH1
L5 L5 FB FB
+5V
+ + C23 C23
22uF/16v 22uF/16v
BJT Amplifier for RGB Video
L8 L8 2.7uH 2.7uH
G G_IN
C26 C26 C29 C29
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
GOUT
Vdc
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
24x1 24x1
3V3
24
GND
23
VCOM
22
GND
21
R
20
GND
19
B
18
GND 17
G
16
GND
15
CPH1
14
STHL 13
OEH
12
OEV
11
CKV
10
STVL 9
GND
8
SPL+
7
SPL-
6
SPR- 5
SPR+
4
VCC_TFT
+5V GND
3
+5V
2
+5V 1
C21 C21 C31 C31 C32 C32 J4 J4
+ + + +
22uF/16V 22uF/16V 22uF/16V 22uF/16V 100N 100N
TFT3V3
C40 C40
100N 100N
TFT3V3 HEADER 26 SMD0.5 BOTTOM HEADER 26 SMD0.5 BOTTOM
1 GND
GND 2 VCC
26
VCC 3 VGL
25
VGL VGL VGH
24 4
VGH 23 VGH 5 STVR
STVR 6 STVL
22
STVL STVL 7 CKV
21
10K 10K CKV CKV 8 U/D
20
UND 19 U/D 9 OEV
OEV OEV 10 VCOM
18
VCOM VCOM VCOM VCOM VCOM 11 VCOM
17
R9 10K R9 10K VCOM 12 L/R
16
LNR 15 LR 13 MOD
MOD MOD 14 OEH
14
OEH OEH 15 STHL
13
STHL STHL 16 STHR
12
11 STHR 17 CPH3
CPH3 18 CPH2
10
CPH2 19 CPH1
09
CPH CPH1 20 VCC
08
07 VCC 21 GND
C38 C38 GND 22 VR
06
ROUT VR 23 VG
05
22P 22P GOUT VG 24 VB
04
BOUT 03 VB 25 AVDD
AVDD 26 AVSS
02
AVSS
01
C22 C22
XS2 XS2
100nF 100nF
+5V
V_BIAS
L3 L3 33UH 33UH 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 601 601
AMP_VDD
+ + C33 C33 C35 C35
10uF/16v 10uF/16v 0.1uF 0.1uF
GND