Samsung SGH-P400 Service Manual page 13

SG H- P400 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)
VCCD
R110
NC
TA_VEXT
Q102
CHG_DET
3
1
2
CN100
6
1 1 6
22 5 5
4
3 3 4
C100 G G G G
C103
C104
100NF 10 9 8 7
33PF
33PF
VBAT
49 50
54
SIMRST
UP_RST
53 UP_CLK
SIMCLK
52
SIMDATA
UP_I O
44
ADC_AUX1
45 ADC_AUX2
56 ADC_TRI G
3
VACC
2
VBAT
R1130
1
TA_VEXT
VEXT
43
BTEMP
46
PWR_ON
PWR_SW1N
47
JIG_ON
PWR_SW2
13 RTC_ALMN
21
PWR_KEEP
20
PSW1_BUF
14
INTRQ
15
UP_SDI
SDI
16
SDO
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
BACKLIGHT_1
BACKLIGHT_2
R111
10K,1%
CHG_ON
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VBAT
C101
33PF
C105
C106 1UF
100NF
VREF
VOSC
51 48 29 30 28 6
40
VLDO_7
VDD67 41
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
VDD34 38
VCC_1.8A VCCD
39
VLDO_3
12
VRTC
11
VLDO_2
19
RESETN
9
VLDO_1
10
VDD12
C116
1UF
5 4 7 8
R112
0
4
U101
3
ISENSE
1 6
DRIVE
2 GND 5
VSENSE
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 VPAC
C111 C112
VBAT
1UF 470NF
C113
100PF
R105
10
RST
C114 C115
C117
2.2UF 10NF
1UF
Q101
6
5
2
1
C118
10UF
6.3V
R108
TA_VEXT 10K,1%
ICHRG
R109
3K
VRTC
R103
1.2K,1%
1
POS
M1
NEG
2
VBAT