4.3.1 Power

Circuit Diagram

4.3.1.1 Power-On Trouble

+2.6V MSMP2

U503

4.3 Logic Part Trouble

Test Point

U502

+1.4V_ MSMC

+2.6V_ MSMP2

+1.8V_ MSMP1

+2.9V_ RX0

+2.8V_ TCXO

+2.9V_ RX1

+2.6V_ MSMA

Checking Flow

START

YES

Check Battery Voltage> 3.4V ?

NOCharge of Change Battery and try again

Replace the U502

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

U502 PWR_ON

Check the voltage Level of the following port at U502

+1.4V_MSMC+2.6V_MSMP2+1.8V_MSMP1+2.6V_MSMA+2.8V_TCXO

+2.9V_RX

The logic level at PS_HOLD(R502) of U502 = 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

V_CHAR

C605

VBATT(+VPWR)

Q603 Pin1 CON603

Q600

Q601

Q602

Checking Flow

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

START

YES

Voltage at +V_CHARof Q601 = 5V?

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

Replace Q600, Q601Voltage at C605 = 5V?

Voltage at +VPWRof Q603 = 4.2V?

YES

YES

YES

NO

NO

YES

Replace Q603

The logic level at CHG_MODEof Q602 = Low?

NOReplace Q602

Is the batterycharged

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

Charging will operate properly

YES

4.3.2 LCD

Circuit Diagram

4.3.2.1 LCD Trouble

Test Points

• LCD Control signals

From MSM : D2[0:15], MLCD_REST/, SLCD_RESET/,

MLCD_CS/, SLCD_CS/, WE2/, RS

F404F406

F408

F409

F407

F403

F405

CON400

U502

+2.8V_LCD

• Check point

- The assembly status of the LCD Module

- The Soldering of connector

START

Voltage at +2.8V_LCDof U502 = 2.8V?

Check theControl signal

D2[0:15], RESET/,LCD_CS/, WE2/,RS

Change the LCD Module

No

No

Yes

Yes

Yes

Replace U502

Check CON400 soldering Re-solder CON400

Yes

Checking Flow

; Check F403, F404, F405, F406, F407, F408, F409

4.3.3 Camera

Circuit Diagram

4.3.3.1 Camera Trouble

• Camera Control signals

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

CAM_CLK_IN, CAM_PCLK

Test Points

VR603

CON601

• Check point

- The assembly status of the Camera Module

- The Soldering of connector

U503

X400

L400

VR600 VR601 VR602

U505

START

Check the clock to Camera at L400(48MHz)

Check the clock from Cameraat VR602 : 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

Check CON601 soldering Re-solder CON601

Yes

Checking Flow

; Check VR600, VR601, VR602, VR603

Check the voltage of the following LDOs :+2.8V_CAM_AVDD+2.8V_CAM_VDD +1.8V_CAM_VDD

No

Replace U503/U505

Yes

4.3.4 Audio

Circuit Diagram

4.3.4.1 Speaker Trouble

Test Points

U301

C302C301

L304L303L301L302

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

Voltage at L300Is about 3.4~4.2V

START

Check the audio signal atC301, C302

Check the audio signal atL301~L304

Check the Soldering ofU301

Check the stateOf contact of speaker

Speaker will work properly

NO

NO

NO NO

Yes

Yes

Yes

Yes

Yes

Replace L300

Replace U301

Re-solder U301

Check the Soldering ofC301, C302

NO

Yes

Replace MSM

Re-solder C301, C302

Checking Flow

NOReplace Speaker

4.3.4.2 Receiver Trouble

Circuit Diagram

Test Points

U301

C302C301

L304L303L301L302

L306

L305

Voltage at L300Is about 3.4~4.2V

START

Check the audio signal atC301, C302

Check the audio signal atL305, L306

Check the Soldering ofU301

Check the stateOf contact of receiver

Receiver will work properly

NO

NO

NO NO

Yes

Yes

Yes

Yes

Yes

Replace L300

Replace U301

Re-solder U301

Check the Soldering ofC301, C302

NO

Yes

Replace MSM

Re-solder C301, C302

Checking Flow

NOReplace Receiver

4.3.4.4 Headset Trouble

Circuit Diagram

Test Points

U301

C302C301

L304L303L301L302

L306

L305

C311

C309

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

Level of C309, C311is about 1.2V ?

Check soldering ofPin2,3 of CON302

Changemain board

DownloadS/W

Re-soldering ofPin2,3 of CON302

Yes

Yes

No

No

Yes

Yes

Headset detect problem

Level of pin4 of CON302Is 1.65~2.10V?

Re-solder R315

No

Yes

1

Check soldering R315

Check solderingQ300

Level of EAR_JACK_SENSE/

Is low?

Re-solder Q300

Download SW

4

No

Headset sending path problem

Headset detectproblem

Headset sending

path problem 3

Level of pin4 of CON302Is 1.65~2.10V?

Does it work?

Re-solder R315

Download SW

Does it work well?

4

Change mainboard

No

No

Yes

Yes

Yes

No

No

No

Yes

Yes

Yes

4.3.4.3 Mic Trouble

Circuit Diagram

Test Points

M200

R238

SETTING : After initialize 5515C, Test Cellular

START

Check the voltage level at R238 is 1.0~2.0V

Check the soldering Of R238

Re-solder R238

Replace MSM

Check the signal levelat each side of MIC.

Replace the microphone

Check the soldering at C2001, C2002

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 C2001, C2002

4.3.6 Vibrator, Mini SD Detect, and USB Interface

Circuit Diagram

4.3.6.1 Vibrator

Test Points

R417

Q401

Q402

D400

R416

R418

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 R416, R417, R418

Re-solder R416, R417, R418

Check the state atContact of Vibrator

Re-contact vibrator

Replace Vibrator

The vibrator willWork properly

No

No

No

Yes

Yes

Yes

Yes

Is Q401, Q402Working?

Replace Q401, Q402No

Yes

Circuit Diagram

4.3.6.2 Micro SD Detect

Test Points

CON300

PIN 1

R503U502

PIN 2PIN 3PIN 4PIN 5

PIN 7PIN 8

PIN 9

Checking Flow

START

Level of SD_DETECT at PIN 9of CON300 is ‘High’ ?

Level of +3.0V_SD at U502is 3.0V ?

Levels of SD_CMD(PIN3 of CON300)and SD_DATA[0]~DATA[3](CON300)

are ‘High’ ?

THE MINI SD CARD WILL BE DETECTED

Check the soldering of R327 & CON300

Replace U502

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

Replace the MSM

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

C538

R200

R538 U502

Test PointsX200

Checking Flow

START

YES

Level of VBUS at R538is 5.0V ?

NOCheck the connecting of the data cable

Check the voltage of the followingport at U502VIO=2.6V?VPU=3.3V?

YES

NO

YES

Check the soldering U502Re-soldering

U502

Replace U502

Replace the MSMLevel of USB_SUPEND at C538 is ‘Low’ ?

Check the voltage level at R537Is it almost 3.3V?

YES

YES

NO

NOCheck the soldering

R537,R544,R545

Re-solderingR537,R544,R545

Replace U502

THE USB INTERFACE WILL WORK PROPERLY

The Frequency at X200 is 48 MHz?

YES

NO

Check the soldering X200,R200Re-soldering X200,R200

Replace X200,R200

NO

NO

YES

YES

NO

YES