Philips 50PUN6102/61 Service Manual page 35

8-3-7 SYSTEM POWER
+12V= 16V for 50" & 55" power board
MAIN POWER
Connector
CN701
15 16
BL_DIM BL_ON
13 14
PS_ON
11 12
9 10
7 8
5 6
3 4
1 2
CONN
+12V
+12V_AUD
+12V +12V_AUD
FB703
1 2
120R 3A
16V -> 5V
Standby Power
R726 470K1/10W
U701
9/11 14V -> 5V(for
23 3
V5_VN
Power saving)
TON VN
17
VN
18
VN
19
16V -> 5V
VN
20
VN
21
VN
+12V
22
R728
BST
2.2 OHM
ZD701 2
VCC
RLZ9V1B
C710
8
R701 0.1uF 25V
LX
9
10UF 10V
LX
1 10
R720
AGND LX
16 V5_LX
LX
100K
56K 1%
2V_EN 5 6
EN PGND
11
PGND
12
R721
PGND
13
C717
PGND
4 14
PGOOD PGND
15
100nF 16V
PGND
V5_LX 25
39K 1%
LX-T
V5_VN 26
VN-T
7 24
20K--> 39K NC FB
G5383AQU1U
R730,C736,C737,C738--> NC
EN =(16V-9.1V)x(39k/(56k+39k)) = 2.83V
EN : LOW=1.65 , High=5V C716 NC---> 22pf
Standby Power +3V3SB
3V3SB / 186mA
+5V_Standby U704 +3.3V_Standby
3 2 +3.3V_Standby
VI VO
C730 C731 C732
100NF 16V 10UF 10V
100NF 16V
G1117-33T63Uf
SOT223 1A/3.3V
+12V
C701 C703 + C702
100PF 50V 0.1uF 100UF 25V
+19 use
PS_ON
+12V_AUD
C707 C708
100PF 50V 0.1uF
5VSB / 2.05A
+12V
C714 C734
Reserve C740 and C739
10uF 50V 0.1uF
for Ripple current.
C711 C740 C739
L701 10UF 10V 10UF 10V
4.7uH +5V_Standby
R730 R714 C713 C712 + C735
NC
10UF 10V 10UF 10V 220UF 16V
0R05 1/10W
C738 C716
NC R717
C736 C737 22PF 50V
22K-->21K
NC NC R729
21K 1% 0 OHM 1/8W
R719 4.7KOHM 1%
Vout = 0.9x(1+22K/4.7K) = 5.11V
DRAM Power 1.8V
+1.8V_DDR2
+5V_Normal U703
3 2
VIN VOUT
C728 R744 C729
4.7UF 6.3V
100NF 16V AZ1117CD-ADJTRG1
110R 1/10W 1%
R745
SOT252 48.7 OHM +-1% 1/10W
+5V_Standby +5V_Normal
Q702
AO3401A
R702
C704
C705
330NF 16V
47K 1/16W 5% 0.1uF
R703
7K5 1/16W 5%
R704 1K 1/16W 5%
Q701
C706 MMBT3904
1UF 10V
Backlight controller
BL_DIM R705 BRIGHT_ADJ
BRI_ADJ
100R 1/16W 5%
C709
100PF 50V
+5V_Normal
R709
4K7 1/16W 5%
R712
100R 1/16W 5%
7 BL_ON BL_ON BL_ON_OFF
R715
Q705
C715 MMBT3904 R716
4K7 1/16W 5%
1NF 4K7 1/16W 5%
R731
BL_ON
6 BL_O
4K7 1/16W 5%
+5V_Standby
C718 C719 R722 R723
10UF 10V 100NF 16V
U702
10R 1/16W 5% 4K7 1/16W 5%
9
E-PAD
1 8
VCC VIN
2 7
REF LX
3 6
C721 C722
GND PGND
4 5
FB EN
100NF 16V
100NF 16V C727
AT1529F11U
100PF 50V
+5V_Normal /
???mA
Standby controler
6
+5V_Standby
R706
1K 1/16W 5%
PS_ON
+3.3V_Standby
Q703
MMBT3904
R711 Back Light On / Off
HI => POWER_OFF
1K 1/16W 5%
LO => POWER_ON
BL_ON/OFF
VBL_CTRL 6
BL_ON/OFF
R718 NC
Core Power 1.15V
+1.15V_VDDC / 435mA
C720
4.7UF 10% 10V
2/6 4.7uH -->2.2uH
+1.15V_VDDC
L702 R724
2.2uH C724 C726 C723
C725 47UF 6.3V
10UF 10V 1UF 25V
6.2K OHM 1% 1/10W
R1
22UF 20% 6.3V R725
2/6 330ohm -->390ohm
Vout = 0.8x(R1+R2)/R2
390 OHM 1% 1/10W
R727
R2
15K 1/10W 1%
+3.3V_Standby
R707 +3.3V_Standby
R708
4K7 1/16W 5%
R710
4K7 1/16W 5%
4K7 1/16W 5%
PWR_ON
Q704 R713
PWR-ON/OFF 6
MMBT3904 4K7 1/16W 5%
H => POWER_ON
L =>
POWER_OFF