Samsung J120FN Troubleshooting Manual
8. Level 3 Repair
8-1. Components Layout
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
ANT1000
ANT1001
ANT5000
ANT5001
BH4000
BH4001
BH4002
BTC4000
C1001
C1004
C1005
C1006
C1007
C1010
C1012
C1013
C1015
C1016
C1019
C1020
C1021
C1022
C1023
C1027
C1029
C1030
C1031
C1032
C1033
C1034
C1035
C1037
C1038
C1040
C1041
C1042
C1043
C1044
C1045
C1046
C1047
C1048
C1049
C1050
C1051
C1052
C1053
C1054
C1055
C1056
C1057
C1058
C1059
C1060
C1061
C1062
C1063
C1064
C1065
C1066
C1067
C1069
C1070
C1071
C1072
C1073
C1074
C1075
C1076
C1077
C1078
C1079
C1080
C1081
C1082
C1083
C1085
C1087
C1088
C1089
C1090
C1091
C1092
C1093
C1097
C1099
C1100
C1102
C1103
C1105
C1106
C1108
C1110
C1113
C1114
C1115
C1116
C1117
C1118
C1119
C1120
C1122
C1123
C1124
C1125
C1126
C1127
C1129
C1130
C1131
C1132
C1133
C1134
C1135
C1138
C1139
C1140
C1917
C2001
C2002
C2003
C2004
C2006
C2007
C2008
C2009
C2010
C2011
C2012
C2015
C2016
C2017
C2020
C2021
C2022
C2025
C2026
C2031
C2032
C2033
C2034
C2035
C2036
C2037
C2038
C2039
C2040
C2041
C2042
C2043
C2044
C2045
C2046
C2047
C2048
C2049
C2050
C2052
C2054
C2056
C2058
C2061
C2064
C2065
C2067
C2071
C2072
C2073
C2074
C2075
C2077
C2079
C2081
C2082
C2083
C2084
C2085
C2086
C2089
C2090
C2091
C2092
C2093
C2094
C2095
C2959
C2960
C2965
C2966
C3002
C3004
C3005
C3006
C3007
C3008
C3009
C3010
C3012
C3013
C3016
C3018
C3019
C3020
C3022
C3023
C3024
C3025
C3026
C3027
C3028
C3029
C3030
C3031
C3032
C3035
C3037
C3038
C3039
C3041
C3044
C3045
C3046
C3049
C3050
C3051
C3052
C3053
C3054
C3055
C3056
C3057
C3058
C3059
C3060
C3061
C3062
C3063
C3064
C3065
C3066
C3067
C3068
C3069
C3072
C4000
C4002
C4003
C4005
C4006
C4008
C4009
C4010
C4011
C4012
C4013
C4014
C4015
C4016
C4017
C4018
C4019
C4020
C4021
C4024
C4025
C4026
C4028
C4029
C4031
C4032
C4033
C4034
C4037
C4038
C4039
C4042
C4043
C4044
C4045
C4048
C4049
C4050
C4051
C4052
C4053
C4055
C4056
C4057
C4058
C4059
C4060
C4061
C4062
C4063
C4064
C4065
C4067
C4068
C4069
C4070
C4071
C4076
C4077
C4078
C4079
C4080
C4081
C4082
C4083
C4084
C4085
C4086
C4087
C4088
C4089
C4090
C4091
C4092
C4093
C4094
C5001
C5002
C5003
C5004
C5005
C5007
C5008
C5009
C5011
C5012
C5013
C5014
C5015
C5016
C5017
C5020
C5022
C5023
C5024
C5026
C5027
C5029
C5031
C5033
C5034
C5036
C5037
C5038
C5039
C5040
C5043
C5044
C5045
C5046
C5047
C5049
C5051
C5053
C5054
C6000
C6005
C6008
C6009
C6011
C6012
C6013
C6014
C6015
C6016
C6017
C6018
C6019
C6022
C6023
C6024
C6025
C6026
C6027
C6028
C6029
C6031
C6032
C6033
C6034
C6036
C6037
C6038
C6039
C6040
C6041
C6043
C6044
D4000
D5000
EAR5000
F1000
F1003
F1004
F1005
F1006
F2000
F2002
F2003
F2004
F2006
F2007
F2900
HDC6000
HDC6001
IFC4000
L1000
L1001
L1002
L1003
L1004
L1005
L1006
L1007
L1009
L1010
L1011
L1012
L1014
L1016
L1017
L1018
L1019
L1020
L1021
L1022
L1023
L1024
L1025
L1026
L1027
L1028
L1029
L1030
L1031
L1032
L1033
L1035
L1036
L1038
L1039
L1040
L1041
L1042
L1043
L1045
L1048
L1049
L1050
L1051
L1052
L1053
L1054
L1057
L1058
L2001
L2002
L2004
L2005
L2006
L2007
L2008
L2009
L2010
L2011
L2012
L2013
L2014
L2016
L2017
L2019
L2021
L2022
L2024
L2025
L4001
L4002
L4003
L4004
L5002
L5003
L5004
L5005
L5006
L5007
L5008
L5009
L5010
L5011
L5012
L5014
L5017
L6000
L6001
L6002
L6003
L6004
OSC2000
OSC2001
PAM1001
R1000
R1001
R1003
R1004
R1005
R1006
R1007
R1008
R1009
R1010
R1011
R1012
R2000
R2001
R2002
R2003
R2004
R2005
R2006
R2007
R3005
R3006
R3007
R3008
R3009
R3010
R3011
R3012
R3013
R3014
R3015
R3016
R3017
R3018
R3019
R3020
R3024
R3026
R3027
R3029
R3030
R3031
R3033
R3034
R3035
R3036
R3037
R3040
R3041
R3043
R3044
R4001
R4002
R4003
R4004
R4005
R4006
R4007
R4008
R4009
R4010
R4011
R4014
R4015
R4016
R4017
R4022
R4023
R4024
R4025
R4026
R4027
R4028
R4030
R4031
R5000
R5001
R5002
R5006
R5018
R5028
R5030
R5034
R5035
R5036
R5038
R5039
R5043
R5045
R5046
R5048
R5049
R5051
R5054
R5055
R6000
R6002
R6006
R6007
R6008
R6009
R6010
R6012
R6014
R6015
R6016
R6017
R6018
R6019
R6020
R6021
R6022
R6024
R6027
R6029
RFS1000
SIM6000
SIM6001
SPK5000
TAC5000
TAC5001
TAC5002
TCX1000
TH3000
TH4000
TP_ACC_INT
TP_BT_PWR_ON
TP_BT_UART_CTS_N
TP_BT_UART_RTS_N
TP_BT_UART_RXD
TP_BT_UART_TXD
TP_C6000
TP_C6001
TP_C6002
TP_C6003
TP_C6004
TP_GPS_RTS
TP_GPS_RXD
TP_GPS_TXD
TP_LCD_MIPI_CLK_N
TP_LCD_MIPI_CLK_P
TP_LCD_MIPI_D6000
TP_LCD_MIPI_D6001
TP_LCD_MIPI_D6002
TP_LCD_MIPI_D6003
TP_NFC_EN
TP_NFC_FIRM
TP_NFC_IRQ
TP_RF0_SPI_RST
TP_WLAN_D2000
TP_WLAN_HOST_WAKE
TP_WLAN_PWR_ON
TP2000
TP2003
TP2004
TP2005
TP2006
TP2007
TP2009
TP2010
TP3003
TP4000
TP4002
TP4004
TP4006
TP4007
TP4008
TP4011
TP6000
U1000
U1001
U1002
U1003
U1006
U1008
U1009
U1010
U2000
U2001
U2002
U2003
U2004
U2006
U2008
U2010
U2013
U2014
U2018
U2019
U2021
U2022
U2023
U2024
U2025
U2026
U2027
U2028
U2029
U2031
U2033
U2034
U2035
U2037
U2038
U2900
U2905
U4002
U4003
U5000
U5003
U6000
U6001
U6002
U6003
U6006
U6007
U6008
U6009
U6010
U6012
U6013
U6014
UCP3000
UME5000
VR4000
ZD4000
ZD4001
ZD5000
ZD5002
ZD5004
ZD5005
ZD5007
ZD5008
ZD5009
ZD5010
ZD5011
ZD5012
ZD5013
ZD5014
ZD6000
ZD6001
ZD6004
8. Level 3 Repair
POT
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
ANT5002
ANT5003
ANT5004
ANT5005
C1136
CN6000
L5001
L5015
L5016
MIC5000
SUS3000
SUS3001
SUS3002
TP_LPDDR_CKN
TP_LPDDR_CKP
TP_PM_PERI2000
TP4005
U6011
8. Level 3 Repair
MOTTOB
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
8. Level 3 Repair
8-2. Block Diagram
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
8. Level 3 Repair
8-3. Flow Chart of Troubleshooting
Oscilloscope Digital Multimeter
Power Supply + driver, ESD Safe Tweezer
8960 & Spectrum Analyzer Soldering iron
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
s o
g
8. Level 3 Repair
8-4. Power On
Mobile phone does not power on.
Check the Battery
Is it more than 3.8V?
Voltage.
Yes
Power-on the phone,
check the power-on
or motor Vibration.
Check the PWR_KEY
(soldering crack, open,
Check the signal of
AP_PS_HOLD = 1.8V
Check the
Clock OSC4000
Is the frequency
check the initial operation
sound
i
etc)
END
k?
No
Yes
Yes
Yes
Yes
No
If its voltage level is extremely low(under 3.0V),
Yes
No
Check the output voltage of U4000
No
No
(C4014, C4018 >1.35V, C4019 > 1.95V, L4000 > 1.1V, L4001 > 1.35V,
L4002 > 1.95V)
If the output voltage is not normal, Change the U4000
※ Each volta
Replace the OSC4000.
※ Test condition (Oscilloscope setting)
: 20.0us.div (time division)
Charging the battery by TA.
Change the battery.
Change the FRONT-LCD ASSY
Resolder or replace TAC5000
e level has ±10% margin.
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
)
8. Level 3 Repair
8-4-2. Initial
Initial Failure.
Yes
Re-download latest
SW on the mobile
Re Check "8-4-1 Power on"
Trouble shooting process
Change UCP3000
Change PBA
phone.
END
Abnormal
Yes
No
NO
Check the OSC4000 (Crack, open etc.)
Check the U4000(Crack etc
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
8. Level 3 Repair
8-4-3. No Service
Check menu setting
Menu → applications → setting → network connections →
more networks → mobile networks → network mode → setting is auto connect ?
Home screen → Phone → Keypad
→ *#1234# → check Phone version
→ CP : G120FXXXX or unknown
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
No service
Yes
CP : unknown
Check the components of
Antenna Path. Is it ok?
Yes
Check VREF
VREF(C1098) = 1.8
Yes
Change the PBA
Yes
END
CP : G120FXXXX
Check the Main Antenna exists or not.
No
No
Resolder the components
Replace the TCX1000
8. Level 3 Repair
8-4-4. Sim Part
Insert SIM card
Is SIM socket ok?
Is SIM/SD assy
well connected to
main board?
Check the SIM
Voltage.
C6042 >= 1.8V?
END
Yes
Yes
Yes
Yes
No
Reassemble SIM/SD assy and still SIM does not work,
replace SIM/SD assy
No
Change to the new SIM card.
If it doesn`t still work SIM card after changeing
the SIM card, Check the UCP3000 (Crack etc)
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
ging
8. Level 3 Repair
8-4-5. Charging Part
TA / USB Insert
Checking Volt at
C4067 = 5V?
Checking Volt at
C4051 = 3.3V?
Resolder or
Replace U4000
and then Check
Char
or not
END
Yes
Yes
Yes
Yes
- First of all, Please check the battery status.
No
No
Reconnect TA or USB
Swap the Sub PBA
Resolder or Replace U4000
or
No
Check The IC's around U4000
or
Swap the Main PBA.
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
y
8. Level 3 Repair
8-4-6. Microphone Part
Check microphone function
in voice call reciever mode
or in Voice Recording mode
Check the MIC on
PBA is placed for
damage
an
Check the L5004
soldering status
and Check the
voltage at
L5004 = 2.8V
END
Something Wrong
No
Yes
Yes
No
Resolder or replace MIC5000
Resolder or replace U4001
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Distribution, transmission, or infringement of any content or data from this document without Samsung’s written authorization is strictly prohibited.
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