Samsung E715 Service Manual Trouble Shooting
2. SGH-E715 Flow Chart of Troubleshooting
1. Power ON
'Power ON' Does not work
Check the current consumption
Current consumption
≥100mA ?
YES
Check the V bat. voltage
Voltage ≥ 3.3V ?
YES
Check the pin of U100
pin #11 ≥ 2.8V ?
YES
pin #39 and #33 = 2.8V
NO
NO
NO
NO
Down load again
Charge the Battery
Check U100 and C110
YES
Check the clock signal
at pin #3 of OSC400
Freq.=13MHz,Vrms 300mV
YES
Check the Initial operation
END
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Pin #9=1.8V?
YES
NO
2-1
NO
Check U100 and C109
Check the clock generation
circuit (OSC400, U402 pin#4)
SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams
2. System Initial
Initial Failure
The pin #9 of U100 = 1.8V
and pin #11 of U100=2.8V?
YES
Is the pin #19 of U100
" Low --> High" ?
YES
There is 32.768KHz wave
form at the C324, C325 ?
YES
Is the pin #25 of U100
is High ?
NO
NO
NO
NO
Check the U100
(If it has some problem,
it has to be replaced.)
Check the U100
(If it has some problem,
it has to be replaced.)
Check the U303
Check the U300
YES
The voltage is "High"
at the C106,C112,C113 ?
YES
LCD Display OK ?
YES
Sound operation OK ?
YES
END
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NO
NO
NO
2-2
Check the U100
Check the LCD part
Check the Audio part
3. SIM Part
"Insert SIM" is displayed on the LCD
SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams
Is there any signal
pin #52,53,54 of U100 ?
YES
Is there any signal
pin #1,2,3,6 of CN100 ?
YES
Check the SIM Card
NO
Check the U303
NO
Check the U100
END
2-3
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SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams
4. Charging Part
Abnormal charging operation
The pin #17,18 of CN101
(VEXT) is 5V ?
YES
The pin#2 of U102 is Low?
YES
The pin#3 of U102 is Low?
YES
The pin#5 of U101 is
3.2~4.2V?
NO
NO
NO
NO
Replace TA or check CN101
Check the U102
Check the U102
Check the U101
YES
The ICHRG =1V(during charging)
&180mV(fullcharging)?
YES
END
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2-4
NO
Solder again or change
R119
RTCALAR M
PWR_KEEP
KEY_COL(2)
KEY_ROW(0)
TA_VEXT
CHG_DET
PWR_O N
JIG_ON
3
2
VRTC
R11 0
390K
Q102
DTC144EM
C103
470N F
C105
100N F
1
Q100
SGH-E715 Flow Chart of Troubleshooting and Circuit Diagrams
CN100
1
4
1
4
2
5
2
5
6
3
3
6
G
G
GG
7
89
54
53
52
44
45
56
3
2
1
43
46
47
13
21
20
14
15
16
17
18
22
23
24
25
26
27
55
57
58
59
60
C117
10UF
10V
10
49
UP_RST
UP_CLK
UP_IO
ADC_AUX1
ADC_AUX2
ADC_TRIG
VACC
VBA T
VEXT
BTEM P
PWR_SW1N
PWR_SW 2
RTC_ALM N
PWR_KEEP
PSW1_BUF
INTRQ
SDI
SDO
SCLK
CSN
EN_3
EN_4[0]
EN_4[1]
EN_5
EN_5A
EN_5B
RING_PW M
GN D
GN D
GN D
GNDD
D
N
G
2
1
6
6
D
N
G
3
6
C102
C101
33PF
33PF
SIMRST
SIMCLK
SIMDATA
VBAT
TA_VEXT
R114
UP_SDI
330K
UP_SCLK
UP_CS
EN_VRF
EN_VPAC
XOEN A
R118
CHG_O N
10K,1%
1
3
2
C100
33PF
C104
100NF
30
48
50
51
T
K
I
M
O
S
L
I
S
_
R
C
V
_
_
M
I
M
M
I
I
S
S
S
U100
R
V
V
D
R
_
D
G
_
D
D
N
B
N
N
I
I
V
R
G
G
4
5
4
6
U103
1
2
3
6
28
29
F
F
1
Q
E
E
D
D
R
R
D
N
V
C
N
G
VLDO_7
G
VDD67
VLDO_6
VL5S_A
VL5S_B
VLDO_5
VDD5
VL4S_A
VL4S_B
VLDO_4
VDD34
VLDO_3
VRTC
VLDO_2
RESETN
VLDO_1
VDD12
V
V
R
R
D
D
_
_
1
D
E
L
78
1
2
6
5
4
2
D
E
L
ISENSE
GND
VCC
U101
D
N
G
5
6
6
6
DRIVE
VSENSE
PRO G
R120
47K,1%
D
D
D
N
N
N
G
G
G
8
7
6
6
BACKLIGHT2
BACKLIGHT1
6
5
4 3
VBA T
VREF
40
41
42
32
31
33
34
36
35
37
38
39
12
11
19
9
10
C107
10U F
10V
Q101
6
5
2
4
1
3
TA_VEXT
R121
3K
C108
470NF
C109
2.2UF
R119
10K,1%
VBAT
VCC D VCC_1.8A
VRF
C110
2.2U F
C116
10U F
10V
C106
2.2U F
ICHRG
VPAC
C111
2.2U F
VOSC
C112
2.2U F
VCC A
10U F
C113
VCC B
C114
2.2U F
10V
C115
100PF
VRTC
S
O
P
G
E
N
R115
1.2K
1
2
RST
M1
2-5
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