Samsung S5550 Troubleshooting
Flow Chart of Troubleshooting
9.
Baseband
9-1.
Power ON
9-1-1
Power On'does not work
'
Yes
Check the Battery Voltage
is more than
VINT
C328(
Check the Clock at
OSC300
VDD_IO_LOW_1.8V)
C333(
C307(VDD_IO_HIGH_2.6V)
Yes
) = 2.55
Yes
=32
H"?
"
3.4V
V?
KHZ
Yes
Yes
No
No
No
&
=
No
Change the Battery
Check the PMU related to VINT
Resolder OSC
Check the related circuit
300
C335(VDD_GSM_CORE_1.2V)
V?
=1.2
Yes
Check the initial operation
Yes
END
No
Check the VDD_GSM_CORE_1.2V
9-1
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circuit
Flow Chart of Troubleshooting
9-2
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Flow Chart of Troubleshooting
9-3
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Flow Chart of Troubleshooting
9-1-2.
Initial
Initial Failure
Yes
CP200 pin A8(RSTBB_
U
H"?
="
Yes
CP200 pin A15
U
RSTEXTn
(
Check the16bit data signal
memory CE
&
OK?
)="
Yes
H"?
N)
No
Check the circuit related to reset
No
changeUCP200
END
Yes
9-4
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Flow Chart of Troubleshooting
9-5
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Flow Chart of Troubleshooting
9-1-3.
SIM Part
pin3of SIM400inafew second
Phone can't access SIM Card
Yes
SIM
Check SIMCLK Signal on
pin
400
After Power ON,
1 ="
Yes
Yes
H"?
No
No
Resolder or replace SIM4
Check the Clock
00
After SIM card insert,
SIM400pin
2 ="
Check the SIM Card
END
H(SIMRST)"?
Yes
Yes
No
Resolder or replace UCP200
9-6
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Flow Chart of Troubleshooting
TP400
Z
R
D
3
R307
0
4
8
0
C344
0
Z
D
TP401
C
R417
4
1
R
C
7
3
4
U305
0
1
9
8
C346
L305
C345
4
0
1
SIM400
9-7
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Flow Chart of Troubleshooting
9-1-4.
Charging Par
Abnormal charging part
Check the
U300
t
Yes
pin A2,B2
U300
>4.9V
Yes
pin D7(AUX_ON)
L"?
="
Yes
No
No
Check the circuit related to
VCHG_5V
Check the circuit related to
AUX_ON signal
END
9-8
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Flow Chart of Troubleshooting
9-9
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Flow Chart of Troubleshooting
9-1-5.
Microphone Part
Microphone does not work
Check the connection
from MIC
Check the circuit
fromUCP200 to MIC
Yes
No
Reconnect MIC
Yes
No
Resolder the R426, R427, C422, C424, R429
Yes
Check IFC400 PIN
='H'?
Yes
Check the MIC
Yes
END
9
No
No
Check the JACK_INsignal
Replace the MIC
9-10
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Flow Chart of Troubleshooting
9-11
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Flow Chart of Troubleshooting
9-12
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Flow Chart of Troubleshooting
9-1-6.
Speaker Part
Speaker does not work
Is there any signal at
pin AH9(SPK_P)
Is Speaker working?
Yes
AH10(SPK_N)
Yes
No
&
?
No
Resolder or replace UCP200
Change the Speaker
END
Yes
9-13
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Flow Chart of Troubleshooting
9-14
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