Samsung SGH-P408 Service Manual page 14

SG H- P408 F low Chart of Troubleshooting
C102
2.2UF
VRTC
R101
NC
RTCALARM
PWR_KEEP
R102
330K
Q100
KEY_COL(2)
3
1
2
KEY_ROW(0)
BACKLIGHT_1
BACKLIGHT_2
VCC D
R110
NC
TA_VEX T
Q102
CHG_DE T
3
1
2
CN100
6 6
11
5
2 2 5
4 4
33
G G G G
C100
C103
C104
100NF 10 9 8 7
33PF
33PF
VBA T
49 50
54
SIMRST UP_RST
53
SIMCLK
UP_CL K
52
SIMDAT A
UP_IO
44 ADC_AUX1
45
ADC_AUX2
56
ADC_TRI G
3 VACC
2 VBAT
1
TA_VEX T VEXT
43
BTEM P
46
PWR_ON
PWR_SW1N
47
JIG_ON PWR_SW 2
13
RTC_ALMN
21
PWR_KEE P
20 PSW1_BUF
14
INTRQ
15
UP_SD I
SD I
16
SD O
17
UP_SCLK
SCLK
18
UP_CS
CSN
22
EN_VRF
EN_3
23
EN_VPAC
EN_4[0 ]
24
EN_4[1 ]
25
XOENA
EN_5
26
EN_5A
27
EN_5B
55 RING_PWM
57
GND
58
GND
59
GND
60
GNDG
R111
10K,1 %
CHG_ON
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VBA T
C101
33PF
C105
C106 1UF
100NF
VRE F
VOSC
51 48 29 30 28 6
VLDO_7 40
41
VDD6 7
42
VLDO_6
32
VL5S_A
31
VL5S_B
33
VLDO_5
C110
34
VDD5
1UF
36
VL4S_A
35
VL4S_B
U100
37
VLDO_4
38
VDD3 4
VCC_1.8A
39
VLDO_3
12
VRTC
11
VLDO_2
19
RESETN
9
VLDO_1
10
VDD1 2
C116
1UF
5 4 78
R112
NC
4
U101
ISENSE
1 6
DRIVE
2 GND 5
VSENS E
3 4
VCC PROG
U102
C119
10UF
6
1
10V
2
R107
47K,1%
5
3
4
3- 2
VCCA VCCB
C108 C109
1UF 1UF
VRF VPA C
C111 C112
VCC D VBA T
1UF 470NF
C113
100PF
R10 5
10
RS T
C114 C115
C117
2.2U F 10NF
1UF
6
Q101
5
2
1
3
C118
10UF
6.3V
R108
TA_VEX T 10K,1%
R10 9
3K
VRTC
R103
1.2K,1%
1
POS
M1
NE G
2
VBAT
ICHRG