Samsung GT-E2121B User manual

GSM TELEPHONE
GT-E2121B
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View and Parts list
6. MAIN Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
9. Chart of Troubleshooting
10. Reference data
11. Disassembly and Assembly
Instructions
GSM TELEPHONE CONTENTS
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This Service Manual is aproperty of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
Samsung Electronics Co.,Ltd.
2010. 03. Rev.1.0
ⓒ
Country Web Site
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GSPN (Global Service Partner Network)

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9. Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-1
9-1. Power On
No
NotOK
Not OK
Not OK
Not OK
Check VPERM_3.0V,
VANA_2.85V, VRF_2.85V,
VSIM_3.0V, VMEM_1.8V,
VGPIO_2.8V of UCP201
Check the UCP201
END
OK
Check the pin 1of
OSC201 produces clock
signal
Solder OSC201 again
OK
Check the L118
concerning about Jig
Power on
Solder L118 again
OK
Is Power On working?
OK
Repeat sequence
Yes
Change battery
Check battery voltage
is higher than 3.3V
Yes
'POWER ON' does not work

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Flow Chart of Troubleshooting
9-2
EAR_MIC
C150
VBAT
L115
C148
R125
C135
L116
R124
DL118
D3
G
1
S2
3
R120
L113
C137
U313
C133
C134
R126
C147 C149
C136
R119
R117
R122
R138
R139
R137
VCHG_5V
R123
VDD_AIT_3.3V
C132
U314
27
NC
8
8
9
9
21
NC
NC 22
NC 23
24
NC
NC 25
26
NC
19
19
2
2
20
20
3
3
4
4
5
5
6
6
7
7
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
HY20-AB0310
IFC100
1
1
10
10
6
R128
ZD105
1
2
3
4
5
3
4
5
6
ZD104
1
2
L111
L117D
UART0_TD
UART0_RD
VCM_OUT
JIG_ON_IF
AUX_DET
JIG_ON
USB_EN
R_ANT
USB_DP
EAR_P
EAR_SW
EAR_MIC_N
EAR_MIC_P
EAR_SW_REF
USB_DM
EAR_N
L201
W9
UART1_RD W5
W6
UART1_RTS
W8
ICHGN
ICHGP
W12
PMU_VPERM W13
PMU_VRF
W14
PMU_VANA
W15
PMU_VIO
V5
UART1_TD V7
UART1_CTS
V8
POK_OUT
PMU_VSIM
V15
PMU_VMEM
V14
T5
PWM_OUT1
T6
PWM_OUT2
T7
PWM_OUT0
T8
POK_IN
L15
FE_CTRL3
L18
UART0_RD
L19
XTAL_32K_1
UART0_TD
K19
XTAL_32K_2
FE_CTRL2 K15
K18
J18
PCM_SYNC
J19
PCM_CLK
PCM_DI
H16
PCM_DO
H18
H19
SIM_CLK
H15
G1
RFIE_N
F1
RFIE_P
E1
RFID_N
D1
RFID_P
B5
XTAL_SHLD
B6
XTAL_SHLD
B7
XTAL_SHLD
B8
XTAL_SHLD
C1
RFIP_N
A8
XTAL_SHLD
B1
RFIP_P
A2
RFOL
A5
XTAL_SHLD
A6
XTAL_26M_2
A7
XTAL_26M_1
UCP201
PNX4852
A1
RFOH
2
43
1
OSC200
3
21
OSC201
UART1_TD
ONKEY_1
VPERM_3.0V
VRF_2.85V
VANA_2.85V
VGPIO_2.8V
UART1_RD
ICHGN
ICHGP
ONKEY_2
VSIM_3.0V
UART0_TD
DCSRX_N
EGSMRX_P
EGSMRX_N
DU
DD
SIM_CLK
PON_PA
FSC
DCL
UART0_RD
MOD_STANDBY
DCS_TX
EGSM_TX
DCSRX_P
VMEM_1.8V

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Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-3

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Flow Chart of Troubleshooting
9-4
9-2. SIM Part
"Insert SIM" is displayed on the LCD
VSIM_3.0V at the pin#1
SIM200 = "H"?
No
Check the SIM Power
Yes
Is there any signal pin
#2,3,4 of SIM201? Check UCP201
No
Yes
Check the SIM Card
END

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Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-5
C234
G
1314
GG
1516
G
C232
2
34
5
6
7
7
88
99
SIM201
1
1010
11 11
1212
VSIM_3.0V
R213
C233
SIM_CLK
SIM_DATA
SIM_RST

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Flow Chart of Troubleshooting
9-6
9-3. Microphone Part -Phone MIC
Phone MIC does not work
Yes
Not OK
Check the connection
of MIC Solder MIC again
Yes
Replace MIC
OK
Is Phone MIC working?
OK
Solder R118, R132, C141, C145 and
C142 again
Check the components
which are connected to
MIC_BIAS
Solder L108, R131, ZD100 and ZD103
again.
Check the circuit
of MIC PART
END
Not OK
Not OK
No
OK

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Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-7
MAIN_MIC
R118
R132
C142
C146
R130
MIC_BIAS
ZD103ZD100
0ohm
R131
L108
MIC100
C140
C141
C145
MIC_P
MIC_N

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This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-8
9-4. Microphone Part -Earphone MIC
Earphone MIC does not work
Yes
Not OK
Check the connection
of IFC100 Solder pin 3of IFC100 again
Solder L111, L113 and R120 again
Check the circuit
of EAR MIC
OK
Solder R118, R132, C141, C145 and
C142 again
Check MIC_BIAS.
(When UCP201 operates
and call is connected )
OK
END
Not OK
Is Earphone MIC working? Repeat the sequence
Yes
No
OK
Not OK