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"?

No

No

Change the Battery

Check the PMU related to VINT

No

Resolder OSC300

No

Check the related circuit

Yes

C335(+VDD_GSM_CORE_1.2V)

=1.2V?

Yes

Check the initial operation

Yes

END

No

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Check the +VDD_GSM_CORE_1.2V

circuit

Flow Chart of Troubleshooting

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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

No

Check the circuit related to reset

No

Change UCP200

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Flow Chart of Troubleshooting

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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

No

No

No

Check the circuit related to

V_EXT_CHARGE_5V

Check the circuit related to

AUX_ON signal

Resolder or replace UPL300

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Flow Chart of Troubleshooting

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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

No

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

No

Check the Clock

No

Replace PBA

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Flow Chart of Troubleshooting

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2)Slave

Phone can't access SIM Card (slot2)

Yes

SIM900 pin 1,5 = "H"?

Yes

Flow Chart of Troubleshooting

No

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

No

Check the Clock

No

Replace PBA

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Flow Chart of Troubleshooting

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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 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

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Flow Chart of Troubleshooting

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9-6. Speaker Part(Melody)

Speaker does not work

Yes

Flow Chart of Troubleshooting

U408 pin 7 = 2.9V?

Yes

Check input signal is ok ?

(When related function

operate)

Yes

Check output signal is ok ?

(When related function

operate)

Yes

Is Speaker working?

No

No

No

No

Check the PMU related to

+VDD_IO_HIGH_2.9V

Resolder C426, C430, L403, L404,

R419, R421, C427, C431

Resolder L401, L402

Change the Speaker(U407)

Yes

END

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Flow Chart of Troubleshooting

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9-7. Key Data Input

Check Initial Operation

Flow Chart of Troubleshooting

Yes

When one of the keys is

pushed,

is it displayed on LCD?

Yes

When one of the keys is

pushed,

KEY_COL(0:4),

KEY_ROW(0:4)

signal is OK?

Yes

END

No

Check the Key PBA, Dome sheet

&KeyPad

No

Replace the PBA

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Flow Chart of Troubleshooting

9-8. Receiver Part

Receiver does not work

Is Receiver working?

Is Receiver working?

Yes

No

Resolder UCP200 or Change PBA

Yes

No

Replace the Receiver

END

Yes

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9-9. Back Light (for Color Main LCD)

Backlight does not work

Yes

Flow Chart of Troubleshooting

Is LCD Contrast set on high

level in the Menu?

Yes

HEA601 pin 11 = H ?

Yes

Check I2C data is OK?

Yes

END

No

Set LCD Contrast on high level

No

Resolder HEA601 or change PBA

No

check related circuit from UCP200

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Flow Chart of Troubleshooting

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9-10. Key Back Light

Main Key LED does not work

Flow Chart of Troubleshooting

Yes

U600 pin 3(KEY_ON) = "H"?

Yes

U600 pin 1(VDD_KEY_3.3V)

=3.3V?

Yes

END

No

Check the UCP200 related to

"KEY_ON(GPIOA29)"

No

Change the U600

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Flow Chart of Troubleshooting

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9-11. Camera part

"Camera" function does not work

Flow Chart of Troubleshooting

Yes

Check the Camera
connector (CN500)

on LCD module

Yes

CN500 Pin 12 and Pin 14

=2.8V

Yes

CN500 Pin 16 = 1.5V

Yes

R518 or CN500 pin 3

=36MHz

Yes

Replace the camera

module

No

No

No

No

Reconnect the Camera module

Check the UPL300 related to

"VDD_CAM_IO_2.8V" and

"VDD_CAM_AVDD_2.8V"

Check the UPL300 related to

"VDD_CAM_CORE_1.5V"

Check U503 related to 36MHz

Yes

END

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Flow Chart of Troubleshooting

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9-12. GSM Receiver

1)Master

Flow Chart of Troubleshooting

RF input : CH center freq : +67.7kHz

RX ON

Cell Power : -60dBm

Yes

F101 pin13

≥ -65dBm

Yes

F101 pin1,2

≥ -68dBm

Yes

U100

pin24,25 ≥ -70dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

No

No

No

No

Resolder RFS100,C107,R101,R100

Check F101 pin9,12

Resolder C113, C121 L106

U100 pin11,12,16,

=L

32,33≥2.8V
pin10≥1.8V

Yes

No

No

Check ANT Switch

control circuit

Resolder F101

Check & Resolder

C128,C126,C125,C129

And PMU Part

Yes

Check UCP200

END

Yes

Resolder U100

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Flow Chart of Troubleshooting

2)Slave

RF input : CH center freq : +67.7kHz

pinD6(PON_PA_S)=Low,

RX ON

Cell Power : -60dBm

Yes

PAM700 pin11

≥ -65dBm

Yes

PAM700 pin7

≥ -68dBm

Yes

U700

pin17,18≥ -70dBm

Yes

UCP800

pinC6(MOD_STANDBY

_S)=High,

pinA6(BAND_SEL_S)

=Low

No

No

No

No

RFS700,C705,L700,C711,

Resolder

L702,L704,R701,R702

Resolder PAM700

Resolder U700

Resolder UCP800

Yes

Check UCP200

END

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9-13. GSM Transmitter

1)Master

TX ON (5Level)

Yes

F101 pin13

≥ 30dBm

Yes

F101 pin10

≥ 30dBm

No

No

Resolder RFS100,C107,R101,R100

Check F101

pin12 = H (2.6V),

Pin9 = L

Flow Chart of Troubleshooting

No

Check ANT Switch

control circuit

Yes

PAM100 pin11

≥ 30dBm

Yes

PAM100 pin7

≥-4dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

Yes

Check UCP200

No

No

No

Yes

Resolder or Change L109

Check PAM100

pin2,3,4,5,8 is ok?

Yes

U100 pin 11,12,16,

32,33≥2.8V
pin10≥1.8V

Yes

No

Change or Resolder F101

No

Resolder or Change PAM100

Check VBAT or PAM

control signal

Check U100

C128,C126,C125,C129

And PMU Part

Resolder U100

END

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Flow Chart of Troubleshooting

2)Slave

TX ON (5Level)

Yes

PAM700 pin11

≥ 30dBm

Yes

PAM700 pin17

≥0dBm

Yes

U700pin 3,4,5,6

≥0.2Vp_p

Yes

Check UCP200

END

No

No

No

RFS700,C705,L700,C711,

Resolder

L702,L704,R701,R702

Resolder PAM700

Resolder U700

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9-14. DCS Receiver

1)Master

Flow Chart of Troubleshooting

RF input : CH center freq : +67.7kHz

RX ON

Cell Power : -60dBm

Yes

F101 pin13

≥ -65dBm

Yes

F101 pin3,4

≥ -68dBm

Yes

U100

pin22,23 ≥ -70dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

No

No

No

No

Resolder RFS100,C107,R101,R100

Check F101 pin9,12

Resolder C110, C112, L105

=L

Yes

U100 pin11,12,16,

32,33≥2.8V
pin10≥1.8V

No

No

Check ANT Switch

control circuit

Resolder F101

Check & Resolder

C128,C126,C125,C129

And PMU Part

Yes

Check UCP200

END

Yes

Resolder U100

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Flow Chart of Troubleshooting

2)Slave

RF input : CH center freq : +67.7kHz

RX ON

Cell Power : -60dBm

Yes

PAM700 pin11

≥ -65dBm

Yes

PAM700 pin6

≥ -68dBm

Yes

U700

pin15,16 ≥ -70dBm

Yes

No

No

No

RFS700,C705,L700,C711,

Resolder

L702,L704,R701,R702

Resolder PAM700

Resolder U700

UCP800

pinC6(MOD_STANDBY

_S)=High,

pinD6(PON_PA_S)=Low,

pinA6(BAND_SEL_S)

=High

Yes

Check UCP200

END

No

Resolder UCP800

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9-15. DCS Transmitter

1)Master

TX ON (0Level)

Yes

Flow Chart of Troubleshooting

F101 Pin13

≥ 25dBm

Yes

F101 pin8

≥ 25dBm

Yes

PAM100 pin17

≥ 25dBm

Yes

PAM100 pin1

≤-4dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

No

No

No

No

No

Resolder RFS100,C107,R101,R100

Check F101

pin9= H (2.6V),

pin12 = L

Yes

Resolder or Change

C137

Check PAM100

pin2,3,4,5,8 is ok?

Yes

U100 pin11,12,17,

32,33 ≥2.8V
pin 10≥1.8V

No

No

No

Check ANT Switch

control circuit

Change or Resolder F101

Resolder or Change PAM100

Check +VBAT or PAM

control signal

Check & Resolder

C128,C126,C125,C129

And PMU Part

Yes

Check UCP200

END

Yes

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Resolder U100

Flow Chart of Troubleshooting

2)Slave

TX ON (5Level)

Yes

PAM700 pin11

≥ 30dBm

Yes

PAM700 pin19

≥0dBm

Yes

U700pin 3,4,5,6

≥0.2Vp_p

Yes

Check UCP200

END

No

No

No

RFS700,C705,L700,C711,

Resolder

L702,L704,R701,R702

Resolder PAM700

Resolder U700

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9-16. PCS Receiver

- Master only

Flow Chart of Troubleshooting

RF input : CH center freq : +67.7kHz

RX ON

Cell Power : -60dBm

Yes

F101 pin13

≥ -65dBm

Yes

F101 pin5,6

≥ -68dBm

Yes

U100

pin 20 ,21

≥ -70dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

No

No

No

Resolder RFS100,C107,R101,R100

Check F101 pin9,12

Resolder C105, C106, L101

=L

Yes

U100 pin11,12,17,

32,33≥2.8V

pin10≥1.8V

NoNo

Check ANT Switch

control circuit

Resolder F101

No

Check & Resolder

C128,C126,C125,C129

And PMU Part

Yes

Check UCP200

END

Yes

Resolder U100

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Flow Chart of Troubleshooting

9-17. PCS Transmitter

- Master only

TX ON (0Level)

Yes

F101 pin13

≥ 25dBm

Yes

F101 pin8

≥ 25dBm

Yes

PAM100 pin17

≥ 25dBm

No

PAM100 pin1

≤-4dBm

Yes

U100 pin 4,5,6,7

≥0.2Vp_p

No

No

Yes

No

No

Resolder RFS100,C107,R101,R100

Check F101

pin9 = H (2.6V),

pin12 = L

Yes

Resolder or Change

C137

Check PAM100

pin2,3,4,5,8 is ok?

No

U100 pin11,12,16,

32,33≥2.8V
pin10≥1.8V

Yes

No

No

Check ANT Switch

control circuit

Change or Resolder F101

Resolder or Change PAM100

Check +VBAT or PAM

control signal

Check & Resolder

C128,C126,C125,C129

And PMU Part

Yes

Check UCP200

END

Yes

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Resolder U100

[Master] Rx, Tx

Flow Chart of Troubleshooting

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Flow Chart of Troubleshooting

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[Slave] Rx, Tx

Flow Chart of Troubleshooting

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Flow Chart of Troubleshooting

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9-18. Bluetooth part

Bluetooth does not work

Flow Chart of Troubleshooting

Yes

F100 pin 2 ≥ -4dB

Yes

C100 (+position),

is ≥ 1.8V

Yes

C101, C102 is ≥ 3.0V

Yes

TP107, TP100, TP101

≥1.8V
BT100 pin A5
≥1.7V(32kHz)

No

No

No

No

Resolder or replace

C148, ANT100

Resolder C100 and

check the PMU part

Resolder C101, C102 check

or Replace BT100

Check or Replace BT100

Yes

Check UCP200

Yes

END

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Flow Chart of Troubleshooting

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9-19. FM Radio part

Radio does not work

C135, C136 = 2.9V

C131, L107 is OK?

Yes

Yes

No

No

Flow Chart of Troubleshooting

Resolder C135, C136 and

check the PMU part

Resolder C131, L107

Yes

Check UCP200

Yes

END

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Flow Chart of Troubleshooting

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