4.3.1 Power Circuit Diagram 4.3.1.1 Power-On Trouble 4.3 Logic Part Trouble U400 +1.4V_ MSMC +2.6V_ MSMP2 +1.8V_ MSMP1 +2.9V_ RX0 +2.8V_ TCXO +2.6V_ MSMA

4.3.1 Power

Circuit Diagram

4.3.1.1 Power-On Trouble

4.3 Logic Part Trouble

Test Point

U400

+1.4V_ MSMC

+2.6V_ MSMP2

+1.8V_ MSMP1

+2.9V_ RX0

+2.8V_ TCXO

+2.6V_ MSMA

MAIN PCB

Checking Flow

START

YES

Check Battery Voltage> 3.4V ?

NOCharge of Change Battery and try again

Replace the U400

Re-download software & try again

The power-on procedure is completed.The problem may be elsewhere.

The Phone will power on. Replace the main board.

Check the contact of power-keyor dome switch

Push power-on key and check the level change of

U400 ON_SW/

Check the voltage Level of the following port at U400

+1.375V_MSMC +2.6V_MSMP2 +1.8V_MSMP1

+2.6V_MSMA +2.8V_TCXO

+2.9V_RX0

The logic level at PS_HOLD(R402) of U400 = High ?

Does it work properly?Does it work properly?

YES

YES

YES

YES

NO

NO

NO

NONO

YES

Circuit Diagram

4.3.1.2 Charging Trouble

Test Points Q404

+V_PM

Q405Q401

Q402

MAIN PCB

Checking Flow

SETTING : Connect the battery and the charging adaptor (TA) to the phone

START

YES

Voltage at +V_CHARof Q401 = 4.8V?

NO The charging adaptor (TA) is out of order.Change the charging adaptor.

Replace Q401, Q402Voltage at Q404 = 4.8V?

Voltage at +V_PMof Q405 = 4.2V?

YES

YES

YES

NO

NO

YES

Replace Q404

The logic level at BATT_FET/of Q405 = Low?

NOReplace Q405

Is the batterycharged

NOThe battery may have the problemChange the battery and try again.

Charging will operate properly

YES

MAIN PCB

4.3.2 LCD

Circuit Diagram

4.3.2.1 LCD Trouble

Test Points

• LCD Control signals

From MSM : D2[0:15], LCD_REST/, LCD_CS/, WE2/, A2[7]

F100F101F102F103

CON600

U402

+2.8V_LCD

• Check point

- The assembly status of the LCD Module

- The Soldering of connector

Coaxial Cable

CON100 CON101

MAIN PCB

SUBPCB

START

Voltage at +2.8V_LCDof U402 = 2.8V?

Check theControl signal

D2[0:15], RESET/,LCD_CS/, WE2/,A2[7]

No

No

Yes

Yes

Yes

Replace U402

Check CON600,CON100 soldering Re-solder CON600 ,CON100

Yes

Checking Flow

; Check F100, F101, F102, F103

Change the LCD Module

No

Yes

Check CON101 soldering Re-solder CON101

No

Replace Coaxial Cable

4.3.3 Camera

Circuit Diagram

4.3.3.1 Camera Trouble

• Camera Control signals

From MSM : CAM_DATA[0:7], CAM_RESET/, CAM_SDA, CAM_SCL,

CAM_CLK, CAM_PCLK

Test Points

F500

• Check point

- The assembly status of the Camera Module

- The Connection of connector

R536

X500

F501

CON502

U400

+2.6V_ CAMIO+2.6V_ CAMA

MAIN PCB

C519

R528

R529

START

Check the clock to Camera at R536(48MHz)

Check the clock from Cameraat C519 : CAM_PCLK

Check theControl signal

CAM_DATA[0:7], CAM_RESET/,CAM_SDA, CAM_SCL

Camera willwork properly

Replace X400No

No

No

Yes

Yes

Yes

Replace the Camera module assay

Check CON502 soldering Re-solder CON502

Yes

Checking Flow

; Check F500, F501,R528,R529

Check the voltage Level of the following port at U400

+2.6V_CAMA +2.6V_CAMIO

No

Replace U400

Yes

4.3.4 Audio

Circuit Diagram

4.3.4.1 Speaker Trouble

Test Points

U302

C315

L300C314

U305

R525

R524

CON502

MAIN PCB

SETTING : “Melody on” at sounds of test menu.

Voltage at L300Is about 3.4~4.2V

START

Check the audio signal atC314, C315

Check the audio signal atR524 ,R525

Check the Soldering ofR524 ,R525

Check the stateOf contact of CON502

NO

NO

NO NO

Yes

Yes

Yes

Yes

Yes

Replace L300

Replace U302

Re-solder R524 ,R525

Check the Soldering ofC314, C315

NO

Yes

Replace U305

Re-solder C314, C315

Checking Flow

NOReconnect Camera ASSAY

Check the stateOf contact of speaker

Speaker will work properly

Yes

NOReplace Speaker

R106 R107

4.3.4.2 Receiver Trouble

Circuit Diagram

Test Points

CON600

Coaxial Cable

CON100

MAIN PCB

SUBPCB

U305

MAIN PCB

R336

R335

START

Check the audio signal atR335, R336


Check the Soldering ofCON600 ,CON100

and Connection of Coaxial Cable

Check the stateOf contact of receiver

Receiver will work properly

NO

NO NO

Yes

Yes

Yes

Yes

Replace CON600 ,CON100, Coaxial Cable

Re-solder CON600 ,CON100

Check the Soldering ofR335, R336

NO

Yes

Replace U305

Re-solder R335, R336

Checking Flow

NOReplace Receiver

MAIN PCB

4.3.4.4 Headset Trouble

Circuit Diagram

Test Points

U303

R331CON604

U304R338

R339

MAIN PCB

Checking Flow

START

Does the audio Profile of the phone change to

the headset mode?

Can you hear your voicefrom the headset?

The headset willwork properly

Insert the headset to the handset.

Change the headset andtry again.

No

No

Yes

Yes

Set the audio part of the testequipment to echo mode

Headset detect problem

Can you hear your voicefrom the headset?

Set the audio part of the test equipment to

continuous wave mode Headset receivingPath problem

Can you hear the soundfrom the headset?

Headset sending path problem

1

4

2

3

No

Yes

No

Headset receiving path problem

2


Check soldering ofPin2,3 of CON604

Changemain board

DownloadS/W

Replace U304

Yes

Yes

No

No

Yes

Yes

Headset detect problem

Level of pin4 of CON604Is 1.65~2.10V?

Re-solder R331

No

Yes

1

Check soldering R331

Check solderingU304

Level of EAR_JACK_SENSE/

Is low?

Re-solder U304

Download SW

4

No

Headset sending path problem

Headset detectproblem

Headset sending

path problem 3

Level of pin4 of CON604Is 1.65~2.10V?

Does it work?

Re-solder R331

Download SW

Does it work well?

4

Change CON604

No

No

Yes

Yes

Yes

No

No

No

Yes

Yes

Yes

4.3.4.3 Mic Trouble

Circuit Diagram

Test Points

M100R117

R125

KEY PCB

SETTING : After initialize 5515C, Test Cellular

START

Check the voltage level at R213 is 1.0~2.0V

Check the soldering Of R213

Re-solder R213

Replace MSM

Check the signal levelat each side of MIC.

Replace the microphone

Check the soldering at VR117, VR125

Check the soldering ofMIC NETWORK

Re-solder MIC NETWORK

MIC will work properly

Checking Flow

Yes

Yes

Yes

Yes

No No

No

No

No

Yes

Re-soldering R117, R125

4.3.6 Vibrator, Mini SD Detect, and USB Interface

Circuit Diagram

4.3.6.1 Vibrator

Test Points

R103

Q100

R101

KEY PCB

R102

Q102

Checking Flow

SETTING : “Vibrator on” at Sounds of test menu

START

Is the voltage of MOTOR_ENabout 2.6V ?

Change the main board

Check soldering of R101, R102, R103

Re-solder R101, R102, R103

Check the state atContact of Vibrator

Re-contact vibrator

Replace Vibrator

The vibrator willWork properly

No

No

No

Yes

Yes

Yes

Yes

Is Q100, Q102Working?

Replace Q100, Q102No

Yes

Circuit Diagram

4.3.6.2 Micro SD Detect

Test Points

CON101

PIN 1PIN 2

PIN 3PIN 4PIN 5

PIN 7

PIN 8

PIN 9

U400

+3.0V_ SD

MAIN PCB KEY PCB

Checking Flow

START

Level of SD_DETECT at PIN 9of CON101 is ‘High’ ?

Level of +3.0V_SD at U400is 3.0V ?

Levels of SD_CMD(PIN3 of CON101)and SD_DATA[0]~DATA[3](CON101)

are ‘High’ ?

THE MINI SD CARD WILL BE DETECTED

Check the soldering of CON101

Replace U400

No

No

No

Yes

Yes

Yes

Frequency of SD_CLK(PIN5of CON300) is about

9.6MHz ?

Yes

No

SETTING : Insert the mini SD card into the phone

Reconnect CON102

Access a file in the micro SD ; play music or view a PIX/FLIX

Replace the main board

Circuit Diagram

4.3.6.3 USB Interface

Test Points

D402

MAIN PCB Q407 X200 R200

Checking Flow

START

YES

Level of VBUS at D402is 5.0V ?

NOCheck the connecting of the data cable

Check the voltage of the followingport at Q407

USB_POWER=5V?

YES

NO

YES

Check the soldering Q407 Replace Q407

Re-soldering Q407

Check the voltage level at R551Is it almost 3.3V?

YES

NOCheck the soldering

R551,R552Replace U400

Re-solderingR551,R552

THE USB INTERFACE WILL WORK PROPERLY

The Frequency at X200 is 48 MHz?

YES

NO

Check the soldering X200,R200Replace

X200,R200

Re-soldering X200,R200

NO

NO

YES

YES

NO

YES

Documents

4.3.1 Power Circuit Diagram 4.3.1.1 Power-On Trouble 4.3 Logic Part Trouble U400 +1.4V_ MSMC +2.6V_ MSMP2 +1.8V_ MSMP1 +2.9V_ RX0 +2.8V_ TCXO +2.6V_ MSMA