Philips PET744 Service Manual page 20

5
7.0 ELECTRICAL DIAGRAM
CIRCUIT DIAGRAM-TFT POWER/BL
D
DCPWM1
DCPWM1
DC_FBK1
DC_FBK1
+9V_TFT
+9V_TFT
VSW
100uH/COIL
1
+5VD
L3
C30
C29
2
0.1uF
10U/10V/0805
D4
BAT54C
C32 0.01uF
C
Q4
1
2 DCPWM1
R41 1K
3018
+9V_TFT
+9V_TFT 2
DCPWM1
DCPWM1 2
DC_FBK1
DC_FBK1 2
B
LP
LP 1
PCK1
PCK1 1
+3.3V_TFT
+3.3V_TFT 1
VGH
VGH 1
VGL
VGL 1
AVDD
1
AVDD
A
5
4
C18 0.1uF
1
3
C21 0.1uF
3
1
VSW
3
C23 0.1uF
1
+9V
SW_DC
3
C26 0.1uF
1 2 2
R40
13K
+9V
DC_FBK1 2
R42
1.8K
+5V_TFT
LD24 FB 600R
EC5
+
C35
100uF10V
0.1uF
R43 R44
10K
10K
3
Q5
BL_EN
2
3904
1
4
3
SS214U DN1
VGL
3 3 2
VGL
2 2
R34 Q1
1
3906
C19 2 1
3
1uF/0805 C20
2 2 4.7k
C22 D1
1
10U/10V/0805
7.5V
1uF/0805
DN2 SS214U
DN3
1
2 2
3
SS214U
R35
VGH
3 2 VGH
Q2
10R
R36
3904
C24
1k
1uF/0805
C25
+
D2 10U/25V/1206
18V
DN4
1
3
SS214U
R37
AVDD
3 2
AVDD
Q3
10R
R38
3904
C27
1k
1uF/0805
C28
+
10U/25V/1206
D3
12V
C33
0.1uF
D5
L5 22uH/CD54 SSD03
1 2
U2
6 1
VIN SW
2 5
GND OV R45
4.7k
FB
4 3
EN FB
SS6610
R46 R47
0R 1R
R27 10K R23 90K
PWM
C34
0.1uF
3
2
LD21 FB 600R
+5VD
IR
DCPWM1
DC_FBK1
PWM
+3.3VTFT
LD23 FB 600R
+9VIN
LP
PCK1
LED +1
+ EC4
2.2UF/16V/0805
LED —1
R48
0R
2
1
D
C
J1
+5V_TFT
14
R18 0R
13
12
R5 0R
11
10
R7 0R
9
8
7
6
+9VIN_TFT
5
BL_EN
4
3
R16 0R
2
1
R14 0R
CON 14P*1.25
B
A
1