Samsung D880 Troubleshooting 6
9. Flow Chart of Troubleshooting
9-1. Power On
' Power On ' does not work
Yes
Check the Battery Voltage
is more than 3.4V
Yes
C421(VISA) = 2.7V?
Yes
Check the Clock at
R404=32KHZ
Yes
C401(+VDD_IO_LOW_1.8V) &
C402(+VDD_IO_HIGH_2.8V) =
"H"?
No
No
Change the Battery
Check the PMU related to VINT
No
Resolder OSC400
No
Check the related circuit
Yes
C426(+VDD_GSM_CORE_1.2V)
=1.2V?
Yes
Check the initial operation
Yes
END
No
9-1
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Check the +VDD_GSM_CORE_1.2V
circuit
Flow Chart of Troubleshooting
9-2
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9-2. Initial
Flow Chart of Troubleshooting
Initial Failure
Yes
UCP200 pin C11 (RSTON) ="H"?
Yes
UCP200 pin F1(RSTEXTn) ="H"?
OK?
Yes
Check the 16bit data signal
&memoryCE
Yes
END
No
Check the circuit related to reset
No
change UCP200
9-3
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Flow Chart of Troubleshooting
9-4
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9-3. Charging Part
Abnormal charging part
Flow Chart of Troubleshooting
Yes
Check the UPL400 pin 38
>4.9V
Yes
UPL400 pin 34(AUX_ON)
="L"?
Yes
Check the UPL400 pin 46
≒1.4V
Yes
END
No
No
No
Check the circuit related to
V_EXT_CHARGE
Check the circuit related to
AUX_ON signal
Resolder or replace UPL400
9-5
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Flow Chart of Troubleshooting
9-6
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9-4. Sim Part
1)Master
Phone can't access SIM Card (slot1)
Yes
SIM200 pin 1,5 = "H"?
Yes
Flow Chart of Troubleshooting
No
Resolder or replace UPL400
After Power ON,
Check SIMCLK Signal on
pin3 of SIM200 in a few second
Yes
After SIM card insert,
SIM200 pin 2 = "H(SIM_RST_1)"?
Yes
Check the SIM Card
Yes
END
No
Check the Clock
No
Replace PBA
9-7
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Flow Chart of Troubleshooting
9-8
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2)Slave
Phone can't access SIM Card (slot2)
Yes
SIM800 pin 1,5 = "H"?
Yes
Flow Chart of Troubleshooting
No
Resolder or replace UPL800
After Power ON,
Check SIMCLK Signal on
pin3 of SIM800 in a few second
Yes
After SIM card insert,
SIM800 pin 2 = "H(SIM_RST_1)"?
Yes
Check the SIM Card
Yes
END
No
Check the Clock
No
Replace PBA
9-9
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Flow Chart of Troubleshooting
9-10
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9-5. Microphone Part
Microphone does not work
Flow Chart of Troubleshooting
Yes
Check the connection
fromMICtoanalogs/w
Yes
Check the circuit
from UCP200 to MIC
Yes
Check the circuit
from UCP800 to MIC
Yes
Check the MIC
No
No
No
No
Resolder MIC, L516, L514
Resolder the C505, C509, R506, C511
Resolder the C506, C510, R507, C512
Replace the MIC
Yes
END
9-11
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Flow Chart of Troubleshooting
9-12
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