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DUAL BAND GSM TELEPHONE
SGH-A400

SERVICE

5.Flow Chart of Troubleshooting and Circuit Diagram
5-1 SGH-A400 Power ON
`POWER ON' does not work Y

Check the current consumption more than 100 mA

N

Download again

Y Check the Battery Voltage more than 3.3V Y

N

Charge the Battery

Check the pin 38 of U400 is more than 3.2 V Y

N

Check to the path from CN604 to pin 38 of U400 and keypad

U400 pin 33,28,30 = 2.8V

N

Change U400

Y

Check the clock signal at R105

N

Check the clock generation circuit (related to U400 and OSC100)

Y Check the initial operation Y END

SAMSUNG Proprietary-Contents may change without notice 5-1

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-2 SGH-A400 Initial
Initial Failure Y

Check the "Reset_B" signal at the pin 6 of U8016 is "High"

N

Check the U100 (IA)

Y

Check the pin 10 of U400 is "High"

N

Check the U201 (M46)

Y

Check the pin 11 of U400 is "High"

N

Check the U400 (PMIC)

Y Check the connections and initialization using Factory Test Program Y Check LCD connector CN601, and resolder bridge

Y END

SAMSUNG Proprietary-Contents may change without notice 5-2

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-3 SGH-A400 Sim Part
Phone can't access SIM card Y

Check the pin 1, 5 of CN400. voltage is 2.8V ?

N

Check the SIM related circuit of the U400

Y

Check the SIM connector's CN400 Connection to SIM card Y

N

Resolder CN400

Check the circuit around U515 (Serial EEPROM) and data stored in it

Y END

VBAT

VCCD

VCCD

C410 150PF

R409 4.7K
44 20 49 50 51 52

R407 4.7K

ISENP
35 36 37 38 4 5 12 2 9 1 3

ISENN

VSUB_P

GND4

GND5

GND6

VREF_CAP

GND7

S_Dat S_Clk PMIC_RESET
VCCD

NC1 NC2 VBAT1 VBAT2

23

GND1

45 46 47

NC3 POWER_KEY ALARM_IN DTR_IN

8 1 7
U8016-1
VSIM

U400

GND3 GND2

CN400 1 1 2 2 3 3 G 4 5 6 4 5 6

6 7 8

ENABLE_1 ENABLE_2 ENABLE_3

RESET_B PMIC_INTERRUPT

2 4

11 POWER_ON_RESET

10 CLOCK_REQUEST

RSS_DATA

G G G 7 8 9 10

SIM_CLK_CARD SIM_ENABLE SIM_DATA_CARD SIM_RST_CARD

BOOST_PULSE BOOT_VDD BOOT_SENSE VBOOST BOOST_ENABLE

16 SIM_DATA_M46

18 SIM_CLK_M46

48 VOUT_8 33 VOUT_1A 34 VOUT1B

31 VOUT_4A 32 VOUT_4B

19

GND_SENSE

22 SIM_RST_M46

30 VOUT_2

28 VOUT_3

29 VOUT_5

27 VOUT_6 43 VOUT_7

24 VSW1 25 VSW2 26 NC4

42 40 41 39 13

17 14 15 21

RSS_CLOCK

VCCD VCCA1

2

3
ZD402

1
R410 100

VOsc

VRF VTIC VSIM VSYN

Sim_Reset Sim_Clk Sim_Dat Sim_En Clk_Rqst
R404 100K

SAMSUNG Proprietary-Contents may change without notice 5-3

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-4 SGH-A400 Charging Part
Abnormal charging part Y Check the pin 17, 18 of CN604-1 is around 5V Y

N

Replace TA

Check the pin 2 of U8021 is "Low"

N

Check the U201 using Factory Test Program

Y Check the pin 5, 6 of U8021 is more than 0.5V Y

N

Resolder R648, R651, R646

Check the Voltage of pin 5 of U605 is between 3.2 V and 4.2 V Y END

N

Change U605

SAMSUNG Proprietary-Contents may change without notice 5-4

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-5 SGH-A400 Microphone Part
Micro Phone does not work Y

check the connection from MIC600 Y

N

Change MIC600

Audio loopback is enabled by board test program. R104, R107 2.2 V

N

Resolder R104, R107, R103

Y END

Mic_Bias
R104 1.1K R103 330

C108 33UF C112 47NF C111 22PF

Mic+
C113 33PF C116 22PF

C115 47NF

MicR107 1.1K

SAMSUNG Proprietary-Contents may change without notice 5-5

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-6 SGH-A400 Speaker Part
Speaker does not work Y Check the connection between CN601 and LCD Module connector Y

Check the connection from CN601 to LCD Module

N

Replace Flexible PCB

Y

Check the voltage on the speaker line lands on LCD Module Y

N

Change the LCD Module

Is Speaker working ?

N

Replace the Speaker or resolder Speaker

Y END

SAMSUNG Proprietary-Contents may change without notice 5-6

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-7 SGH-A400 Key Data Input
Check initial operation Y Check the connection between CN602 and Keypad. Y Check the pin 1, 3, 4, of CN602 is "High" Y

N

Check the M46(U201)

When one of the keys is pushed, one of pin [5:12] of CN602 is "High"

N

Replace the key PCB

Y END

SAMSUNG Proprietary-Contents may change without notice 5-7

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-8 SGH-A400 Ring Indicator
Ring Indicator does not work Y Check the connection between CN602 and Keypad. Y

Check the Q203 pin 2 is "High" Y

N

Check M46(U201) by Factory Test Program

Check the Q203 pin 3 is "Low" Y

N

Replace Q203

CN602 pin 14 = "L" ?

N

Resolder CN602

Y

Key PCB is OK ?

N

Replace the key PCB

Y END

SAMSUNG Proprietary-Contents may change without notice 5-8

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-9 SGH-A400 Back Light
Backlight does not work Y Check the connection between CN601 and LCD Module. Y Backlight "ON" mode in the menu ? Y Check M46(U201) using Factory Test Program

N

Select backlight "ON" mode

CN601 pin 3 = "High" ? Y Check the connection from CN601 to LCD Module Y

N

N

Replace flexible PCB

LCD backlight on ? Y END

N

Replace LCD Module

SAMSUNG Proprietary-Contents may change without notice 5-9

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-10 SGH-A400 Alert Tone
Abnormal Alert tone Y Is there alert wave signal on the R635 during alert tone test? Y

N

ALERT by Test S/W

Is there alert wave signal on the Q603 pin3 during alert tone test?

N

Check the circuit related to Q603

Y

Check the C620 3.3V

N

Resolder D601 and C620

Y

Buzzer is ok?

N

Change the Buzzer

Y END

SAMSUNG Proprietary-Contents may change without notice 5-10

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-11 SGH-A400 GSM Receiver
RX On RF input : 62 CH Amp. : -50 dBm Y

1

U505 Pin 9 -65 dBm Y

N

Resolder or Change CN500

2

U505 Pin 5 -65 dBm Y

N

Resolder& U505 Pin 5 -65 dBm

N

Check voltage U505 pins Pin 2 : L Pin 4 : H Pin 8 : H Pin 10 : L

Y

3

F501 pin 5 -73 dBm Y U507 pin 16, 17 -40 dBm Y

N

Resolder F501

4

N

Check OSC300 pin 1 -10 dBm Y

N

Change OSC300

Change U507

5

F301 pin 1, 2, 5, 6 -47 dBm Y F300 pin 1 -25 dBm Y F300 pin 4 -30 dBm Y Check the signal at U300 pin 26, 27 Y END

N

Change F301

6

N

Check D300 pin 1 1V~2.3V Y

N

Resolder or change D300

Change U300 Change F300

7

N

8

N

Change U300

SAMSUNG Proprietary-Contents may change without notice 5-11

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

1 RX_62_U505 PIN9

2 RX_62_U505 PIN5

SAMSUNG Proprietary-Contents may change without notice 5-13

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

3 RX_62_F501 PIN5

4 RX_62_U507 PIN16

SAMSUNG Proprietary-Contents may change without notice 5-14

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5 RX_62_F301 PIN1

6 RX_62_F300 PIN1

SAMSUNG Proprietary-Contents may change without notice 5-15

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

7 RX_62_F300 PIN4

8 U300_ PIN26

SAMSUNG Proprietary-Contents may change without notice 5-16

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-12 SGH-A400 GSM Transmit
Tx On (level : 5) Battery voltage : 3.8 V Using 20 dB Attenuator N

1

U505 Pin 9 30 dBm N

Y

Resolder CN500

2

U505 Pin 1 30 dBm N

Y

Check voltage Pin 2 : H Pin 4 : L Pin 8 : H Pin 10 : L

Y

Resolder or Change U505

N

Resolder or Change U503, Q501

3

LAM1 Pin 3 30 dBm N

Y

Resolder or Change LAM1

4

U510 pin 4 0 dBm N

Y

Check U510 pin14 1V ~ 2V ? N

Y

Change U510

Change U508

U513 pin 3 1~2.3V ? Y

N

Check OSC300 pin1 -10 dBm Y

N

Change OSC300

Change U300

U513 Pin 9 : H Pin 7 : L Y

Y

Resolder or Change U512

Change U513

Y END

SAMSUNG Proprietary-Contents may change without notice 5-17

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

1 TX_62_U505 PIN9

2 TX_62_U505 PIN1

SAMSUNG Proprietary-Contents may change without notice 5-19

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

3 TX_62_lam1 PIN3

4 TX_62_U510 PIN4

SAMSUNG Proprietary-Contents may change without notice 5-20

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-13 SGH-A400 DCS Receiver
RX On RF input : 698 CH Amp. : -50 dBm Y

1

U505 Pin 9 -65 dBm Y

N

Resolder or Change CN500

Check voltage U505 pins

2

U505 Pin 7 -65 dBm Y

N

Resolder & U505 Pin 7 -65 dBm

N

Y

Pin 2 : L Pin 4 : H Pin 8 : H Pin 10 : L

3

F500 pin 5 -73 dBm Y U507 pin 16, 17 -40 dBm Y

N

Resolder F500

4

N

Check OSC300 pin 1 -10 dBm Y

N

Change OSC300

Change U507

5

F301 pin 1, 2, 5, 6 -47 dBm Y F300 pin 1 -25 dBm Y F300 pin 4 -30 dBm Y

N

Change F301

6

N

Check D300 pin 1 1 V Y

N

Resolder or change D300

Change U300 Change F300

7

N

8

U300 pin 26, 27 Y END

N

Change U300

SAMSUNG Proprietary-Contents may change without notice 5-21

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

1 RX_698_U505 PIN9

2 RX_698_U505 PIN7

SAMSUNG Proprietary-Contents may change without notice 5-23

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

3 RX_698_F500 PIN5

4 RX_698_U507 PIN16

SAMSUNG Proprietary-Contents may change without notice 5-24

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5 RX_698_F301 PIN1

6 RX_698_F300 PIN1

SAMSUNG Proprietary-Contents may change without notice 5-25

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

7 RX_698_F300 PIN4

8 U300_ PIN26

SAMSUNG Proprietary-Contents may change without notice 5-26

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

5-14 SGH-A400 DCS Transmit
Tx On (level : 0) Battery voltage : 3.8 V Using 20 dB Attenuator N

1

U505 Pin 9 25 dBm N

Y

Resolder CN500

2

U505 Pin 11 25 dBm N

Y

Check voltage Pin 2 : L Pin 4 : H Pin 8 : L Pin 10 : H

Y

Resolder or Change U505

N

Resolder or Change U503, Q501

3

LAM1 Pin 1 25 dBm N

Y

Resolder or Change LAM1

4

U510 pin 2 0 dBm N

Y

Check U510 pin14 1V ~ 2V ? N

Y

Change U510

Change U508

U513 pin 3 1~2.3V ? Y

N

Check OSC300 pin1 -10 dBm Y

N

Change OSC300

Change U300

U513 Pin 9 : L Pin 7 : H Y

Y

Resolder or Change U512

Change U513

Y END

SAMSUNG Proprietary-Contents may change without notice 5-27

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

1 TX_698_U505 PIN9

2 TX_698_U505 PIN11

SAMSUNG Proprietary-Contents may change without notice 5-29

SGH-A400 Flow Chart of Troubleshooting and Circuit Diagram

3 TX_698_lam1 PIN1

4 TX_698_U510 PIN2

SAMSUNG Proprietary-Contents may change without notice 5-30