Samsung d780 Troubleshooting 04

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

C323(VISA) = 2.7V?

Yes

Check the Clock at

OSC300=32KHZ

Yes

C301(+VDD_IO_LOW_1.8V) & C302(+VDD_IO_HIGH_2.9V) =

"H"?

Change the Battery

Check the PMU related to VINT

Resolder OSC300

Check the related circuit

Yes

C335(+VDD_GSM_CORE_1.2V)

=1.2V?

Yes

Check the initial operation

Yes

END

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"?

Yes

Check the 16bit data signal

&memoryCE

Yes

END

Check the circuit related to reset

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 UPL300 pin 38

>4.9V

Yes

UPL300 pin 34(AUX_ON)

="L"?

Yes

Check the UPL300 pin 46

≒1.4V

Yes

END

Check the circuit related to

V_EXT_CHARGE_5V

Check the circuit related to

AUX_ON signal

Resolder or replace UPL300

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

SIM300 pin 1,5 = "H"?

Yes

Flow Chart of Troubleshooting

Resolder or replace UPL300

After Power ON,

Check SIM_CLK_1 Signal on

pin3 of SIM300 in a few second

Yes

After SIM card insert,

SIM300 pin 2 = "H(SIM_RST_1)"?

Yes

Check the SIM Card

Yes

END

Check the Clock

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

SIM900 pin 1,5 = "H"?

Yes

Flow Chart of Troubleshooting

Resolder or replace UPL900

After Power ON,

Check SIM_CLK_2 Signal on

pin3 of SIM900 in a few second

Yes

After SIM card insert,

SIM900 pin 2 = "H(SIM_RST_2)"?

Yes

Check the SIM Card

Yes

END

Check the Clock

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

Resolder Analog s/w

(U401, U400)

Resolder the R400, R402, C401, C403,

R401, C402

Resolder the R411, R413, C406, C410,

R412, C409

Replace MIC

(Main Key PBA, HEA600)

Yes

END

9-11

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Flow Chart of Troubleshooting

9-12

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