Samsung X105 Service Manual TSHOO
4. SGH-X105 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 pin#33 =
2.8V
Yes
No
No
No
No
pin#9 = 1.8V
Download again
Charge the Battery
Check U100 and C116
No
Check U100 and C115
Check the clock
signal at pin4 of
OSC400
Freq = 13MHz ,
Vrms ≥ 300mV
and
Vpp = 900mVpp
Yes
Check the initial operation
END
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Yes
No
4-1
Check the clock generation circuit
(related to OSC400, U401 pin 19)
SGH-X105 Flow Chart of Troubleshooting
2. Initial
Initialization Failure
Yes
The pin #9 of U100 = 1.8V
and
the pin #10 of U100 =
2.825V ?
Yes
Is the pin #19 of
U100
"Low -> High"?
Yes
There is 32.768kHz
wave forms at the C320
and C322
Yes
The pin #25 of U100 is
"High"
Yes
No
No
No
No
(If it has some problem, it has to be
Check the U100
replaced.)
Check the U100
(If it has some problem, it has to be
replaced.)
Check the U301
Check the U200
The Voltage is "High"
at the C111,C118
Yes
LCD display is O.K
Yes
Sound is O.K
Yes
END
4-2
No
No
No
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Check the U100
Check the LCD Part
Check the Audio Part
3. Sim Part
"Insert SIM" is displayed on the LCD
SGH-X105 Flow Chart of Troubleshooting
Yes
Is there any Signals
pin#52, #53, #54 of U100?
Yes
Is there any Signals
pin#1, #2, #3, #4 of CN100?
Yes
Check the SIM Card
END
No
Check the U301
No
Check the U100
4-3
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SGH-X105 Flow Chart of Troubleshooting
VRTC
VCCB
VOSCVPAC VCCA
VRF
VCC_1.8A VCCD
VBA T
VREF
34
VLDO_5
U100
VEXT
1
43
TA_VEXT
VDD5
BTEMP
36
VL4S_A
PWR_SW1 N
46
35
VL4S_B
RTC_ALMN
PWR_SW2
13
47
37
VLDO_4
PWR_KEEP
21
CN100
4
4
112233
33
42
41
32
31
VDD67
VL5S_A
VL5S_B
GNDD1
GND
Q
VREF
CREF
VSI
M
SIM_IO
SIM_CLK
SIM_RST
UP_CLK
UP_IO52UP_RST54VACC3VBAT
53
SIMCLK
SIMRST
SIMDATA
44
VLDO_640VLDO_7
ADC_AUX1
45
VBAT
ADC_AUX2
56
ADC_TRIG
2
628
C106
100NF
33PF
C101
5
6
5
6
78
G
G
910
G
G
33PF
C104
33PF
C103
100N F
C102
2.2UF
C105
30
29
48
50 51
49
0
R112
38
VDD34
INTRQ
PSW1_BUF
20
14
UP_SDI
R113
C107
39
VLDO_3
16
330K
100NF
12
VRTC
SCLK17SDI15SDO
CSN22EN_3
18
UP_CS
UP_SCLK
EN_VRF
23
1.2K,1%
R114
11
VLDO_2
EN_4[0]
EN_4[1]
24
25
EN_VPAC
3
EN_5
26
XOENA
1
RST
0
R115
19
RESETN
EN_5A
EN_5B27GND
55
Q100
2
C152
33PF
C151
33PF
C150C14 9
33PF33PF
C148
C147
33PF
C146
33PF
C113
GNDD
2
NEG
1UF
C111
1UF
C110
1UF
C109
1UF
C108
1UF
C112
GND
68
GND
67
GND
66
GND
65
8
LED2_DRV
7
LED1_DRV
4
VIB_DRV
5
RING_DRV
GND
64
GND
63
GND
62
GND
61
C118
C117
100N F
C116
C115
C114
100PF
1UF
2.2U F
1UF
1UF
BACKLIGHT
15
16
17
18
19
20
13
12
D1
D0
21
14
D3
D4
D5
D6
D7
D8
D9
D2
1
22
23
24
25
26
27
D10
D11
D12
D13
D14
D15
U104
RDB
RESETB
RS
VCC
VCC
29
30
VCCD
C123
100NF
CS1B
7
LCD_CSL
WRD
GND
11
10
CP_WENL
BLIGHT_P
28
CP_OENL
LED+
3
BLIGHT_P
8
9
RST
A(2)L
M1
1
POS
9
10
VDD12
VLDO_1
RING_PWM
GND
GND
60
57
58
59
ZD114
2
DUMMY31DUMMY
DUMMY
LED-
4
BLIGHT_N
5
DUMMY32DUMMY
BLIGHT_N
6
DUMMY
C131
R135
R133
C145
C144
C143
C142
C141
C140
C139
C138
C137
C136
C135
C134
C133
C130
33PF
33PF
33PF
33PF33PF
33PF
33PF
33PF33PF
33PF33PF
33PF
33PF 33PF
100NF
1UF
15
15
ZD111
3
2
1
FB
SW
GND
15uH
L100
U105
_SHDN
VIN
4
5
16V
C132
R134
10UF
15K
VBAT
JIG_O N
PWR_ON
RTCALARM
PWR_KEEP
KEY_COL(2)
KEY_ROW(0)
4-4
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LED_EN
SGH-X105 Flow Chart of Troubleshooting
4. Charging Part
Abnormal charging operation
The pin #17, #18 of
CN201 is TA_VEXT =
5V?
Yes
The pin #3 of U101 is
"low"?
Yes
The pin #3 of Q101 is
"low"?
Yes
The ICHRG = 1V(during
charging) and = 180mV(full
charging)?
No
No
No
Replace TA or Check CN201
Check the U101
Check the Q101
No
Solder again or change R130
Yes
END
4-5
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