Samsung SGH-X400 User manual

SGH-X400
SERVICE
Manual
GSM TELEPHONE CONTENTS
1. Specification
2. Exploded Views and Parts List
3. Electrical Parts List
4. Flow Chart of Troubleshooting
5. Block Diagrams
6. PCB Diagrams
GSM TELEPHONE

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1. SGH-X400 Specification
1-1
This Document can not be used without Samsung's authorization
GSM900
Phase 1 EGSM 900 Phase 2 DCS1800 Phase 1 PCS1900
Freq. Band[MHz]
Uplink/Downlink 890~915 935~960 880~915 925~960 1710~1785 1805~1880 1850~1910 1930~1990
ARFCN range 1~124 0~124 &
975~1023 512~885 512~810
Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz
Mod. Bit rate/
Bit Period 270.833kbps 3.692us 270.833kbps 3.692us 270.833kbps 3.692us 270.833kbps 3.692us
Time Slot
Period/Frame Period 576.9us 4.615ms 576.9us 4.615ms 576.9us 4.615ms 576.9us 4.615ms
Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Power Class 5pcl ~ 19pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm -100dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km -
1. GSM General Specification

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1-2
SGH-X400 Specification
This Document can not be used without Samsung's authorization
TX Power
control level GSM900
5 33±2dBm
6 31±3dBm
7 29±3dBm
8 27±3dBm
9 25±3dBm
10 23±3dBm
11 21±3dBm
12 19±3dBm
13 17±3dBm
14 15±3dBm
15 13±3dBm
16 11±5dBm
17 9±5dBm
18 7±5dBm
19 5±5dBm
TX Power
control level DCS1800
0 30±2dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
TX Power
control level PCS1900
0 30±2dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
2. GSM TX power class

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2. SGH-X400 Exploded View and its Parts list
2-1
This Document can not be used without Samsung's authorization
1. Cellular phone Exploded View
1
2
3
4
5
7
8
9
10
6
11
12
13
14
15
16
17
18
19
21
22
20
23

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2-2
SGH-X400 Exploded view and its Part list
This Document can not be used without Samsung's authorization
NO Description SEC.CODE REMARK
1DUAL WINDOW LCD GH75-03088A
2FOLDER UPPER GH75-02636B
3DUAL LCD GH07-00319A
4SPEAKER 3001-001393
5MOTOR 3101-001351
6MAIN LCD GH07-00247A
7FOLDER LOWER GH75-02635B
8MAIN WINDOW LCD GH72-07620A
9SCREW 6001-001155
10 HOLE SHEET(A) GH74-04896B
HOLE SHEET(B) GH74-04897B
11 FRONT COVER GH75-02633B
12 SIDE KEY GH75-02632A
13 KEYPAD GH75-03162A
14 MAIN PBA GH92-01422A
15 DOME SHEET GH59-00745A
16 IF COVER GH73-01688B
17 MIC GH30-00015A
18 ANTENNA GH42-00285A
19 REAR COVER GH75-02634B
20 SCREW 6001-001478
21 SCREW CAP GH73-01692B
22 RF COVER GH73-01743B
23 BATTERY GH43-00830B 900MAH
GH43-00853B 620MAH
2. Cellular phone Parts list

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SGH-X400 Exploded view and its Part list
2-3
This Document can not be used without Samsung's authorization
3. Test Jig (GH80-00865A)
3-1. RF Test Cable
(GH39-00090A)
3-2. Test Cable
(GH00-00127A)
3-3. Serial Cable
3-4. Power Supply Cable 3-5. DATA CABLE
(GH39-00159A)

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3. SGH-X400 MAIN Electrical Parts List
3-1
This Document can not be used without Samsung's authorization
Design LOC SEC Code
GH92-01553A PBA
GH41-00443A PCB
2203-000995 C1003
2203-000233 C1004
2203-002677 C1005
2203-002677 C1006
2203-000233 C1007
2203-002677 C1008
2203-002677 C1009
2203-000812 C101
2203-000233 C1010
2203-005234 C1012
2203-005234 C1013
2203-000812 C1014
2203-000995 C1015
2203-000812 C1016
2404-001151 C1017
2203-000438 C1018
2203-000812 C1019
2203-005061 C102
2203-000812 C1020
2404-001151 C1021
2203-001598 C103
2203-000812 C104
2203-000812 C105
2404-001105 C106
2203-000254 C1063
2404-001268 C107
2203-005482 C108
2203-001652 C109
2203-001652 C110
2203-000438 C1101
2203-000679 C1102
2203-000995 C1103
2203-001405 C1104
2404-001105 C1105
2203-000885 C1106
Design LOC SEC Code
2203-005512 C1107
2203-000254 C1108
2203-005065 C1109
2203-006053 C111
2203-001405 C1110
2203-005509 C1111
2203-001405 C1112
2203-001405 C1113
2203-005065 C1114
2203-005480 C1115
2203-005481 C1116
2203-005481 C1117
2203-005481 C1118
2203-005480 C1119
2203-006053 C112
2203-000438 C1120
2203-000278 C1121
2203-005050 C1122
2203-001405 C1123
2203-001405 C1124
2203-001652 C113
2203-001598 C114
2203-000254 C115
2203-006053 C116
2203-006053 C117
2203-000233 C118
2203-000812 C119
2203-005061 C120
2203-001598 C121
2203-000254 C201
2203-006113 C202
2203-006113 C203
2203-006113 C204
2203-006113 C205
2203-006113 C208
2203-006113 C209
2203-006257 C212

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SGH-X400 Electrical Parts List
3-2
This Document can not be used without Samsung's authorization
Design LOC SEC Code
2203-005509 C213
2203-005061 C214
2203-005061 C215
2203-005682 C220
2203-005682 C221
2203-005682 C222
2203-005682 C223
2203-005682 C224
2203-005682 C225
2203-005682 C226
2203-005682 C227
2203-005061 C301
2203-005061 C302
2203-005061 C303
2203-005061 C304
2203-000812 C305
2203-000359 C401
2203-005061 C402
2203-001405 C403
2203-005061 C404
2404-001086 C405
2203-000995 C406
2203-000995 C407
2203-000885 C408
2203-005061 C409
2203-005065 C410
2404-001086 C413
2203-000438 C416
2203-005061 C417
2404-001151 C420
2404-001151 C421
2203-005061 C422
2203-005065 C423
2203-000438 C425
2203-000438 C426
2203-005682 C430
2203-005682 C431
Design LOC SEC Code
2203-005682 C432
2203-005682 C433
2203-005682 C434
2203-005682 C435
2203-005682 C436
2203-005682 C437
2203-000812 C441
2203-000940 C450
2203-005061 C501
2203-005061 C502
2203-005061 C503
2203-000254 C504
2203-005061 C505
2203-005496 C601
2203-005496 C602
2203-000254 C603
2203-000254 C604
2203-000254 C605
2203-000254 C606
2203-005480 C607
2203-005061 C608
2203-001405 C609
2203-000679 C610
2203-000254 C611
2203-000628 C613
2203-000233 C614
2203-000628 C615
2203-005496 C704
2203-005065 C705
2203-005061 C706
2203-000254 C707
2203-005480 C708
2203-005480 C709
2203-000254 C710
2203-000254 C711
2203-000254 C712
2203-000233 C801

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3-3
SGH-X400 Electrical Parts List
This Document can not be used without Samsung's authorization
Design LOC SEC Code
2203-000233 C802
2203-000233 C803
2203-000254 C804
2203-000254 C805
2203-000254 C806
2203-000995 C904
2203-001405 C905
2203-000812 C906
2203-000233 C908
2203-001405 C909
2203-000233 C910
2203-001405 C911
3705-001255 CN1001
3709-001187 CN101
3711-005078 CN201
3710-001816 CN300
3722-001715 CN401
0405-001110 D1101
0405-001110 D1102
2909-001191 F1001
2904-001450 F1002
2203-005234 L1001
2203-001195 L1002
2703-002602 L1003
2703-002603 L1004
2703-001734 L1005
2703-002608 L1006
2703-001409 L1007
2703-001794 L1101
2703-002102 L1102
2703-002102 L1103
2703-001235 L401
2703-001235 L402
2703-001235 L403
2703-001235 L490
2703-001751 L901
0601-001819 LED201
Design LOC SEC Code
0601-001819 LED202
0601-001790 LED203
0601-001790 LED204
0601-001790 LED205
0601-001819 LED206
0601-001790 LED207
0601-001819 LED208
0601-001819 LED209
0601-001819 LED210
0601-001790 LED211
0601-001790 LED212
0601-001790 LED213
0601-001790 LED214
0601-001819 LED215
0601-001819 LED216
0604-001261 LED217
0601-001790 LED218
0601-001790 LED219
0601-001790 LED220
0601-001790 LED221
4302-001130 M101
2801-004189 OSC1101
2801-004025 OSC601
2809-001260 OSC801
0502-001201 Q101
0506-001052 Q102
0504-000168 Q103
0504-000168 Q104
0504-001012 Q1101
0501-000225 Q401
2007-001288 R1001
2007-001307 R1002
2007-007008 R1003
2007-007008 R1004
2007-001288 R1005
2007-001307 R1006
2007-007008 R1007

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SGH-X400 Electrical Parts List
3-4
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Design LOC SEC Code
2007-007008 R1008
2007-007107 R1009
2007-000171 R101
2007-007142 R102
2007-007139 R103
2007-001323 R104
2007-000758 R105
2007-000171 R106
2007-000171 R107
2007-000171 R108
2007-000172 R109
2007-001319 R110
2007-000172 R1101
2007-007135 R1102
2007-000148 R1103
2007-000162 R1104
2007-000172 R1105
2007-000174 R1106
2007-000775 R1107
2007-000148 R1108
2007-000162 R1109
2007-000171 R111
2007-000148 R112
2007-000172 R201
2007-001291 R202
2007-001301 R218
2007-008587 R220
2007-008587 R221
2007-008587 R222
2007-008587 R223
2007-008587 R224
2007-008587 R225
2007-008587 R226
2007-008587 R227
2007-000157 R301
2007-000157 R302
2007-000157 R303
Design LOC SEC Code
2007-000140 R304
2007-000140 R305
2007-000140 R306
2007-000140 R307
2007-000140 R308
2007-000140 R309
2007-000140 R310
2007-000140 R312
2007-000140 R313
2007-003001 R401
2007-000162 R402
2007-003001 R403
2007-000164 R404
2007-000161 R405
2007-000775 R406
2007-000159 R407
2007-000148 R408
2007-001325 R410
2007-000159 R411
2007-000141 R412
2007-001316 R413
2007-000141 R414
2007-000148 R415
2007-000159 R416
2007-001333 R417
2007-000140 R418
2007-000171 R419
2007-000148 R421
2007-008587 R430
2007-008587 R431
2007-008587 R432
2007-008587 R433
2007-008587 R434
2007-008587 R435
2007-008587 R436
2007-008587 R437
2007-000171 R502

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3-5
SGH-X400 Electrical Parts List
This Document can not be used without Samsung's authorization
Design LOC SEC Code
2007-000172 R503
2007-000160 R504
2007-000157 R601
2007-000171 R602
2007-000170 R603
2007-000157 R605
2007-007142 R606
2007-007308 R607
2007-007308 R608
2007-000162 R609
2007-000157 R610
2007-000157 R611
2007-000162 R701
2007-007200 R702
2007-007200 R703
2007-000162 R704
2007-000162 R705
2007-000171 R710
2007-000172 R801
2007-000137 R802
2007-001313 R803
2007-000138 R804
1201-001889 U1001
GH71-01052A U1002
1203-002127 U101
1203-002902 U102
1204-002023 U1101
1201-001951 U1102
1203-002054 U1103
1009-001010 U202
1001-001183 U401
1204-002161 U402
1001-001152 U403
1109-001274 U501
GH09-00023A U601
1209-001219 U602
1204-001984 U701
Design LOC SEC Code
0504-001042 U702
0504-001042 U703
0504-001042 U704
1205-002185 U901
1205-002268 U902
1209-001434 U903
3404-001152 VOL_DOWN
3404-001152 VOL_UP
0406-001150 ZD301
0403-001427 ZD302
0406-001150 ZD303
0406-001150 ZD304
0406-001150 ZD305
0406-001150 ZD306
0406-001150 ZD307
0406-001150 ZD308
0406-001150 ZD309
0406-001150 ZD310
0406-001150 ZD311
0406-001184 ZD312
0406-001150 ZD313
0406-001150 ZD402
0406-001150 404

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4. SGH-X400 Flow Chart of Troubleshooting
4-1
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1. Power On
Check the current
consumption more
than 100mA
'Power On' does not work
Check the Voltage
more than 3.3V
Download again
Charge the Battery
Check the pin
11 of U102 is
more than 2.8V
Check U102 and C117
U102 pin 39,33
=2.8V Check U102 and C116
Check the clock
signal at pin3 of
OSC801
Freq=13MHz ?
Vrms≥300mV ?
Vpp is around
900mVpp ?
Checktheclockgeneration
circuit
(related to OSC801)
Check the initial operation
END
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
U102 pin 9
=1.8V
No
Yes

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4-2
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
2. Initial
Check the signal at the
pin 19 of U102 is "High"
when the phone is boot
on
Initialization Failure
Check U102
END
No
Yes
Check the pin 26 of
U102 is "High"
Yes
Check the U701
Check the pin 4 of
OSC801 is around 2.8V
Check the soldered status of
OSC801,R801,U102
Yes
No
Yes
Check LCD connector CN201,
and resolder bridge
Yes
No

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SGH-X400 Flow Chart of Troubleshooting
4-3
This Document can not be used without Samsung's authorization
3. Sim Part
Check the pin 1 of
CN101. voltage 3V ?
Phone can't access SIM card
Check the SIM
connector's (CN101)
connection to SIM
card
Check the circuit related to
U102
Resolder or change CN101
Check the circuit around CN101
input
circuitry
END
No
Yes
Yes
Yes
Yes
No
Check the related circuit of
CN101
No
Check the circuit around U601
output
and vlotage supply circuitry
Yes
Check the related circuit of
U601 and U102
No

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4-4
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
4. Charging Part
Check the pin 17, 18
of CN300 is
TA_VEXT>4?
Abnormal charging part
Check the pin 5 of
Q102 is "High"?
Replace TA,Check CN300
Check the Q102
Check the Q102
END
No
Yes
Yes
Yes
Yes
No
No
Check the pin 3 of
Q102 is "Low"?
Check the pin 5 of
U101 is "3.2~4.2V"? Check the U101
No
Yes
Check the pin 5
1.5V~1V(during
charging) and around
200mV(full charging)?
No Check the U101 or Resolder or
change R102
Yes

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SGH-X400 Flow Chart of Troubleshooting
4-5
This Document can not be used without Samsung's authorization
3
1
2
5
6
4
10V
VCCD
Q101
VBAT
C107
10UF
VCC_1.8A
C102
100NF
0
R106
R105
VBAT
330K
33PF
C105
2.2UF
C103
33
445
56
6
G
78GG
910
G
CN101
112
2
1
3
2
R104
3K
C115
Q103
0
10NF
1UF
R111
VBAT
C117
VBAT
470NF
C113
VRTC12
VSIM
48
31
VLDO_19
VLDO_211
VLDO_339
VLDO_437
VLDO_533
42
VLDO_6
40
VLDO_7
VREF
30
VDD34
VDD534
VDD6741
1VEXT
VIB_DRV
4
36
VL4S_A
VL4S_B35
32
VL5S_A
VL5S_B
51
49
SIM_RST
53UP_CLK
52UP_IO
UP_RST
54
VACC
3VBAT
2
10
VDD12
38
19
RING_DRV
5
RING_PW
M
55
13RTC_ALM
N
SCLK
17
SDI
15
SDO
16
SIM_CLK
50
SIM_IO
28
GNDQ
INTRQ
14
7
LED1_DRV
8
LED2_DRV
PSW1_BUF
20
21PWR_KEEP
PWR_SW1N
46
47PWR_SW
2
RESETN
EN_5A
26
EN_5B
27
57GND
58GND
GND
59
60GNDG
GNDD1
6
45ADC_AUX2
56ADC_TRI
G
43BTEM
P
29
CREF
18CSN
22EN_3
EN_4[0]
23
24EN_4[1]
EN_5
25
U102
ADC_AUX1
44
10K,1%
R102
1.2K
R110
DRIVE
6
GND
2
1
ISENSE
PROG
4
3
VCC
5
VSENSE
VRTC
U101
4
R103
47K,1%
Q102
2
5
6
3
1
C106
10UF
6.3V
C116
C109
1UF
VCCB
470NFC110
470NF
10K
R112
33PF
C101
33PF
C104
Q104
13
2
C112
1UF
33PF
C119
VPAC
1UF
C111
100NF
C108
0
R107
VRF
VOSC
R101
0
C118
100PF
TP101
R109
10
VCCA
NEG
2POS
1
C114
2.2UF
R108
0
M101
JIG_O
N
SIMCL
K
SIMRST
RST
KEY_ROW(0)
KEY_COL(2)
TA_VEXT
CHG_DET
ICHR
G
TA_VEXT
UP_SCL
K
UP_CS
EN_VRF
EN_VPAC
VREF
CHG_DISABLE
TA_VEXT
TA_VEXT
XOENA
KEY_BL
PWR_KEEP
PWR_ON
RTCALARM
UP_SDI
SIMDATA

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4-6
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
C802
100PF
C803
100PF
1
330
R803
OSC801
2
GND
3
OUTVCC
4
VT
VOSC
10
R801
C805
10NF
C1063
10NF100
C806
10NF
10NF
C804
R804
100PF
C801R802
2K
AFCCLK13M_RF
CLK13M_YMU
13MHZ_BB
CLK13M_MC
CLK13M_TR

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SGH-X400 Flow Chart of Troubleshooting
4-7
This Document can not be used without Samsung's authorization
BOARD_HOLE
JTAG
C614
100PF
10NF
C604
R610
47K
VCC_1.8A
VCC
D
33K,1%
R607
C602
220NF
VCCD
VBAT_1
GND_1
10NF
C603
VCCD
TMS_1
VBAT
TX_1
G7
RX_1
G2G3
GND
G1
BGAT
C610
27PF
TDI_1
OSC601
HP_PWR_1
TX
VCCD
VCC_1.8A
R601
F_WE_1F_WE
47K
TCK
C609
TCK_1
22NF
VDD11
33K,1%
R608
PPI3
8
PPI49
10
PPI5
12
PPI6
RSTB
4
SCK
2
3SCN
1SDI
14
CS_OUT1
13
CS_OUT2
GND
17
21
NC
NC
22
5
PPI0
PPI1
67
PPI2
U603
16
CS_IN
CS_OUT0
15
TRST_1
TDO_1
R602
0
R606
10K,1%
C615
22PF
C605
10NF
VCC_1.8A
R603
1M
VCC_1.8A
VRTC
G6
33NF
C607
TMS
10NF
C606
220NF
C601
VCCB
10NF
C611
C613
RX
22PF
TRST
HP_PWR
GND
3
2VOVS1
TP600
R611
U602
47K
R605
47K
C612
NC
G4
VCCB
TDO
100K
R609
TP602
XSM0_DATA
XTIC_MODED12
F10
XVREF
T15
XPA6/BE1N
XPA7/IRQ1
M9
T5
XPA8/IRQ2
XPA9/IRQ3
P2
XPWM1
R5
XRTCALARM_NE8
XSM0_CLK
N1
0
U1
2
H14
XPA32_CS0N
N1
7XPA33_T_REQA
XPA34_T_REQB
M1
7
XPA35_A22
L13
N15
XPA36_A23_CS5N
XPA3/CS4N
N14
XPA4/OEN
P16
XPA5/WAITN
P15
XPA24/PWM3
XPA25_OM0
M3
XPA26_OM1
G2
G4XPA27_SM1_CLK
XPA28_IOM0
G5
XPA29_IOM1
F1
M11
XPA2/CS3N
F3XPA30_IM0
XPA31_IM1
E1
P1
3XPA18_T_ACK
XPA19/CP_MOSI
L2
M14
XPA1/CS2N
L1XPA20/CP_MISO
K4XPA21/CP_SCK
XPA22/SSN
J6
H6XPA23/PWM2
H5
N2
XPA10/IRQ4
XPA11/IRDARX
K5
N1XPA12/IRDATX
XPA13_TX1
G6
G3XPA14_RX1
XPA15/TX0
H4
L3XPA16/RX0
XPA17_DRQ0
E4
XCP_KB9/SOUT4
D7XCP_TCK
XCP_TDO
D13
XCP_TMS
G8
F9XCP_TRSTN
C13
XCP_WEN
F4XFRSTB
C6
XOSC32OUT
XPA0/CS1N
M15
XCP_KB1/SIN1
XCP_KB2/SIN2
M4
T1XCP_KB3/SIN3
R2XCP_KB4/SIN4
XCP_KB5/SOUT0
T3
U3XCP_KB6/SOUT1
XCP_KB7/SOUT2
P3
XCP_KB8/SOUT3
T4
N3
XCP_D4
XCP_D5
D6
XCP_D6
E7
D5
XCP_D7
C4
XCP_D8
XCP_D9
B4
C7XCP_TDI
XCP_KB0/SIN0
L4
L5
C1
XCP_D11
XCP_D12
C2
D2
XCP_D13
D3
XCP_D14
XCP_D15
E3
F8
XCP_D2
XCP_D3
F7
C5
XCP_A6
XCP_A7
A15
XCP_A8
B17
C17
XCP_A9
A13
XCP_CSRAMEN
XCP_CSROMEN
A12
XCP_D0
A6
B5
XCP_D1
XCP_D10
B3
XCP_A18
XCP_A19
L14
XCP_A2
E14
XCP_A20
L15
L16
XCP_A21
D15
XCP_A3
B15
XCP_A4
XCP_A5
C14
A16
XCP_A10
XCP_A11
F14
XCP_A12
G14
G13
XCP_A13
XCP_A14
G17
J12
XCP_A15
K12
XCP_A16
XCP_A17
K13
K14
XAG0
XAG1A11
XAG2E11
D11
XAG3
XBSWNB7
XCPTSTSTOP_CKOM12
B13
XCP_A0_BEO
N
F11
XCP_A1
D16
VSS
H11
J7
VSS
K6
VSS
E10
VSSA
E15
VSS_DPL
L
X1RTCA7
D10
X2RTC
B11
L8
VSS
J11
VSS
VSS
L9
A3
VSS
F6
VSS
VSS
G9
G10
VSS
VSS
H7
E17
VDDE
VDD_DPL
LG16
VRTC
D8
VSS
A2
VSS
K7
VSS
L6
L10
VSS
VSS
M7
VDDE
VDDE
B14
VDDE
M1
U2
VDDE
VDDE
P8
U15
VDDE
VDDE
U16
N16
VDDE
VDDE
E16
R4
VDD
VDD
T13
R16
VDD
VDD
R17
A5
VDD
VDD
C16
VDDA
C11
B1
TDI
H12
F12
TDO
G12
TMS
TRST
F15
VDD
E2
L17
VDD
G1
VDD
VDD
R1
INT#0
R12
IO7
IOBIT#1
K11
IOBIT#2
L12
NC1
2
NC
RSTB
C12
RWN
U5
TCK
H13
DB#2
DB#3
P6
U7
DB#4
T7
DB#5
DB#6
R7
M6
DB#7
P7
DB#8
DB#9
N7
N4
U6
DB#1
DB#10
N8
M8
DB#11
DB#12
U11
T11
DB#13
R11
DB#14
DB#15
P10
R6
AB#3
AB#4
P11
P12
AB#5
AB#6
R14
AB#7
T14
T17
AB#8
F17
CKI
G15
CKO
DB#0
P5
U601
U13
AB#0
AB#1
M10
R13
AB#2
N11
C608
100NF
CHG_DET
YMU_EN
VOL_UP_DOWN
RADIO_SHUTDOWN
AUDIO_AMP_EN
CHG_DISABLE
VOL_CTRL
YMU_LED_CT
R
TDI
ICHR
G
VRE
F
WR_PROTECT
CP_TDO
CP_TDI
CP_TMS
CP_TCK
CP_WEN
UP_SDI
UP_SCLK
RST
XLATCH_CS
UP_CS
I2C_CLK
I2C_DATA
DEBUG_R
I
SIMRST
PWR_KEEP
DEBUG_CTS
DEBUG_DTR
DEBUG_RTS
DEBUG_DSR
A(22)
DLC_DETECT
RTCALARM
SIMCLK
SIMDATA
KEY_ROW(2)
KEY_ROW(3)
KEY_ROW(4)
CP_TCK
CP_TDO
CP_TMS
TR_RST
FLASH_RESET
CLK32K
IRDA_RX
IRDA_TX
SDS_TXD
SDS_RXD
DEBUG_TXD
DEBUG_RXD
JACK_IN
XLATCH_C
S
UP_SDI
UP_SCLK
DSP_TMS
TR_RST
BP_V
F
TR_RST
CP_TDI
KEY_COL(0)
KEY_COL(1)
KEY_COL(2)
KEY_COL(3)
KEY_COL(4)
KEY_ROW(0)
KEY_ROW(1)
DSP_DB(3)
DSP_DB(4)
DSP_DB(5)
DSP_DB(6)
DSP_DB(7)
DSP_DB(8)
DSP_DB(9)
DSP_INT
DSP_IO
LED_EN
EL_EN
TR_RST
DSP_RWN
DSP_TCK
DSP_TD
I
DSP_TDO
DSP_AB(4)
DSP_AB(5)
DSP_AB(6)
DSP_AB(7)
DSP_AB(8)
CLK13M_TR
DSP_DB(0)
DSP_DB(1)
DSP_DB(10)
DSP_DB(11)
DSP_DB(12)
DSP_DB(13)
DSP_DB(14)
DSP_DB(15)
DSP_DB(2)
DSP_DB(15:0)
D(0:15)
A(0:20)
KEY_ROW(0:4)
KEY_COL(0:4)
A(21)
DSP_AB(8:0)
CP_CSROM2EN
RST
TR_RST
DSP_AB(0)
DSP_AB(1)
DSP_AB(2)
DSP_AB(3)
D(3)
D(4)
D(5)
D(6)
D(7)
D(8)
D(9)
CP_CSROMEN
CP_CSRAMEN
MLCD_EN
SLCD_EN
CP_WEN
CP_OEN
DEBUG_DCD
UPPER_BYT
E
EAR_SWITCH
FLIP_SNS
YMU_IRQ
CP_INT
A(19)
A(2)
A(20)
A(3)
A(4)
A(5)
A(6)
A(7)
A(8)
A(9)
D(0)
D(1)
D(10)
D(11)
D(12)
D(13)
D(14)
D(15)
D(2)
RESET_INT VBAT
JIG_ON
SDS_RXD
SDS_TXD
A(0)
A(1)
A(10)
A(11)
A(12)
A(13)
A(14)
A(15)
A(16)
A(17)
A(18)

SAMSUNG Proprietary-Contents may change without notice
4-8
SGH-X400 Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
5. Microphone Part
Check the
reference voltage
on mic path
C410 ≒ 2.0V
Microphone does not work
Resolder microphone
END
No
Yes
Yes
Yes
Yes
Is microphone ok? No
Check U701
check the soldered
status of
microphone.
Check the
pin 42 of
U102 is
"2.8V"
Resolder or change R413,
C420, R412, R411, R408,
C410
No
No
Yes

SAMSUNG Proprietary-Contents may change without notice
SGH-X400 Flow Chart of Troubleshooting
4-9
This Document can not be used without Samsung's authorization
6. Speaker Part
Check the
connection from
CN201 to LCD
module
Speakerdoesnotwork
Check the PIN 4
and PIN 8 of
U401='High'?
Check the circuit related
to U401
Check U601
Is speaker ok?
Check U701
END
No
Yes
Yes
Yes
Yes
No
No
Is speaker ok?
Change Speaker
Yes
No