A G ER F Flow

C hart of

Troublesshooting

Fl

ow ChartofTroubl

eshooti

ng

1.PowerOn Fai

l

Power defect

Currenti

ntensi

ty val

ue

over 100mA when

connectPower

Re-Downl

oad

Gauge Power Suppl

y

Currenti

ntensi

ty

A forei

gn

substance atI/F

BAT termi

nalor

SMD error.

Exchange and repai

r

Check M AIN CHIP PIN

VCCD vol

tage val

ue

i

s hi

gher than or

same wi

th 2.

8V

Check Bypass C-CHIP

atCSP and VCCD ends

Vol

tage val

ues

atVRF and

VCCA are 2.

8V

VCC_1.

8V i

s

nomal

Check Bypass C-CHIP

atCSP and VCCD ends

Check TCXO CLOCK

SIGNAL

A

NO

YES

NO

NO

YES

YES

NO

NO

YES

YES

A

Freq = 13MHz or 26MHz

Vrms = under 300mV and

Vpp = 900mV

Check the Ci

rcui

tor

Generati

on(Osci

l

l

ator)

Check whether speci

fi

c s/w

Probl

em or other probl

em.

(Re-TEST after

i

ni

ti

al

i

zati

on)

END

YES

NO

Fl

ow ChartofTroubl

eshooti

ng

2.Si

m PartFai

l

Di

spl

ayed "Insert

SIM"

Is The PIN 1

Vol

tage ofSIM

Connector 2.

8V ?

Check CSP

A forei

gn substance

atSi

m connector or

SMD error.

Exchange and repai

r

There i

s One Si

gnal

atPIN 2,

3,

4 ofSIM

connector

Check TRIDNT

Check SIM CARD

YES

NO

NO

YES

YES

YES

YES

END

Fl

ow ChartofTroubl

eshooti

ng

3.Radati

on Cal

l Fai

l

Radi

ati

on Tel

ephone

Cal

lDefect.

OPEN Ci

rcui

t

between RF termi

nal

and RF CON or Not

Check ShortatEM I

Treatmentpartof

FRONT and REAR

(l

ess than 5Ohm)

RF CON.CHECK

Forei

gn

substance

Servi

ce can or

not

Cal

lfai

lerror

Repai

r OPENED POINT

Check Cal

lTest

Check SERVICE Yes or NO

NO

YES

NO

YES

END

Fl

ow ChartofTroubl

eshooti

ng

4.AGC (Auto Gai

n Control

)Fai

l

Conti

nuous Rx On

RF Input:60CH

Cel

lPow :-60dBm

LocalFreq

1894 MHz

Check

RF IC XTAL1,

2,

13M Hz BB Check

Rx RF

947 MHz

Check

RF Con.AntS/W GSM

LNA IN N,P Check

RF IC RTX QP,QN,

IP,IN M AIN CHIP Check

RX I,

Q DATA

CHECK

M AIN CHIP Check

END

NO

YES

NO

YES

NO

YES

AUTO Cal

i

brati

on

Fl

ow ChartofTroubl

eshooti

ng

5.APC (Auto PowerControl

)Fai

l

TX POW ER FAIL

CH :60

BAND :GSM

F402 8PIN

OUTPUT

CHECK

GSM TX EN CHECK

END

TX IF 902 MHz

U404 6PIN

OUTPUT

CHECK

TX POW ER CHECK

U404(PAM )CHECK OR

REPLACE

CSP CHECK

TX PW R(R417)

TX EN 41PIN

TX BAND SEL

CHECK

U403(RFIC)

23PIN,C404

CHECK

TX I,

Q SIGNAL CHECK

NO

YES

NO

YES

NO

YES

NO

NO

GSM PAM IN

902 MHz

R425 CHECK

YES

Fl

ow ChartofTroubl

eshooti

ng

6.RTC Fai

l

RTC FAIL

CHECK RTC

BATTERY M100

Vol

tage 2.

8V

Check MEM ORY CHECK

OR RTC CRYSTAL

Osci

l

l

ati

on

Check RTC BATTERY

Vol

tage

Execute B'

D TEST

and Check NO ERROR

PASS(NO ERROR)

RTC BATTERY

Chargi

ng TEST

VRTC 3V

CHECK

C121,

R112

Check Vol

tage Ri

si

ng

ofRTC BATTERY i

n

condi

ti

on connecti

ng

power

B'

D TEST(PASS)

VRTC CHECK

NO

YES

NO

YES

YES

NO

YES

REPLACE M 100

(RTC BATTERY)

REPLACE U102

NO

END(PASS)

Fl

ow ChartofTroubl

eshooti

ng

7.D/L (Down Load)Fai

l

D/L FAIL

INTERFACE

SMD Defect

Yes or NO

INTERFACE,TRIDENT

CHECK OR REPLACE

FEED BACK and Repai

r

CHECK Power

Yes or No

REDOW N LOADING

SDS_TXD,RXD

DEBUG_CTS,

RTS CHECK

M EM ORY CHECK

OR REPLACE

REDOW N LOAD

NO

YES

NO

YES

NO

YES

Check Power

END(PASS)

PASS

Fl

ow ChartofTroubl

eshooti

ng

8.AFC (Auto Frequency Control

)Fai

l

AFC FAIL

U403(RFIC)CHECK

OR REPLACE

13MHz(OSC402)CHECK

Check The Auto

Cal

i

brati

on

DefectYes or No

NO ERROR(PASS)

Check OFFSET Val

ue Change

Yes or No i

n proporti

on to

Changed CDAC Val

ue when

AFC TEST

AUTO CALIBRATION

U102(CSP)CHECK

OR REPLACE

NO

YES

NO

YES

NO

YES

U403(RFIC)CHECK

OR REPLACE

END(PASS)

END

Exi

stence of

AFC Si

gnal

Exi

stence of

13MHz_BB

Si

gnal

NO

Exi

stence ofRTX QP,QN

RTX IP,IN

Si

gnal

YES

NO

YES

NO

U302(TRIDENT)

REPLACE

Fl

ow ChartofTroubl

eshooti

ng

9.EAR Phone Recogni

ti

on Fai

l

EAR PHONE recogni

ti

on

FAIL

JACK IN Si

gnal

CHECK E/P IC

E/P IC,E/P JACK

CHECK

Check VCCA(3V)Vol

tage

EAR JACK

OPEN TEST

EAR JACK

REPLACE

CSP CHECK

OR REPLACE

AUXIN,

OUT

Si

gnalCHECK

AOUTBP

AOUTBN

Si

gnalCHECK

CSP CHECK OR

REPLACE

E/P IC CHECK

OR REPLACE

NO

YES

NO

YES

YES

NO

YES

EAR PHONE TEST

END(PASS)

NO

EAR_SW ITCH

Si

gnalCHECK

YES

NO

Fl

ow ChartofTroubl

eshooti

ng

10.BELL(TONE)Sound Fai

l

BELL Sound FAIL

Check Ok or notthe Forei

gn

substance and contact

condi

ti

on atLCD CON.

(CN201)

YMU-EN

(3V)CHECK

CLEAN OR

CONNECTOR REPLACE

BELL Sound TEST

CLK13M_YMU

CHECK

FOLDER

SW AP TEST

M ELODY IC CHECK

OR REPLACE

END(PASS)

NO

YES

NO

YES

YES

NO

YES

END(PASS)

NO

Check

13MHz_BB

(RFIC)

Y

E

S

NO

Check MELODY

IC

YMU_SPK

YES

NO

RFIC CHECK

OR REPLACE

TRIDENT

REPLACE

Fl

ow ChartofTroubl

eshooti

ng

11.KEY l

ock-up Fai

l

KEY l

ock-up FAIL

VOLUMKEY

SHORT TEST

Check

osci

l

l

ati

on of

OSC(crystal

)

VOLUM KEY CHECK

OR REPLACE

END KEY TR,

CSP

REPLACE

KEY PATTERN

SHORT TEST

after remove

KEY DOM

CAMERA KEY

SHORT TEST

TRIDENT CHECK

OR REPLACE

END(PASS)

NO

YES

NO

YES

NO

END(PASS)

END KEY

Acti

ng,END

KEY TR,CSP

CHECK

YES

NO

Tri

dent,

Crystal

CHECK OR REPLACE

Check W rong reconi

zi

ng

KEY KEY.

KEY_COL,KEY_ROW

CAMERAKEY CHECK

OR REPLACE

YES

YES

YES

YES

Fl

ow ChartofTroubl

eshooti

ng

12.CHARGE Fai

l

Chargi

ng MODE FAIL

Gauge the

TA_VEXT(TA)

Chargi

ng Vol

tage

4.

8-5.

0V

DRIVE(U104)

Vol

tage CHECK

CHECK SHORT

and Burn outat

ZENER DIODE GND of

VA_VEXT End

CHARG Ci

rcui

tREPLACE

Check PROG

ICHRG Si

gnalof

CHARG Ci

rcui

t

CHARGING IC

ISENSE Vol

tage

CHECK

Interface

JIG_ON_IFSi

gnalCHECK

END(PASS)

NO

YES

NO

YES

NO

ZENER DIODE

REPLACE

CHG_ON

Si

gnal

CHECK

YES

NO

CHARG TR

REPLACE

TRIDENT CHECK

OR REPLACE

CHARGING IC

REPLACE

YES

NO

NO

JIG_ONSi

gnal

CHECK

Check R,

C-CHIP

and ZENER DIOND

ofJIG ON Si

gnal

End

CSP

REPLACE

YES

NO

NO

Fl

ow ChartofTroubl

eshooti

ng

13. Di

spl

ay Fai

l

Di

spl

ay FAIL

Check (LCD CON)

the damage by

forei

gn substance

FOLDER

SW AP TEST

CN201 REPLACE

(CAM.IC)

CHECK OR REPLACE

LCD_D (0:15)

Si

gnalCHECK

DSP_AB(0:8)

DSP_DB(0:15)

Si

gnalCHECK

MEM ORY CHECK

OR REPLACE

END(PASS)

NO

YES

NO

NO

W hi

te Screen,

Screen Error

Software Down

Load executi

on

YES

NO

FOLDER Defect(PASS)

Software Error(PASS)

FOLDER OR PBA

DefectDi

sti

ncti

on

YES

NO

NO

D(0:15)A(0:20)Si

gnal

CHECK

CSP CHECK

OR REPLACE

U302(TRIDENT)CHECK

OR REPLACE

YES

NO

NO

YES

Fl

ow ChartofTroubl

eshooti

ng

14. I

MEII

nput Fai

l

IM EIi

nput FAIL

POW ER ON

CHECK

Check can dri

ve or

notCommuni

cati

on

Mode

Refer to Power DefectFLOW

CHART

M EMORY REPLACE

Re-Instal

l

END(PASS)

NO

YES

NO

Check Error i

n

Software and

Hardware

YES

NO

Software Down Load and Re-

adj

ustment

Software Down Load

INTERFACE CHECK

YES

NO

ReW ri

ti

ng

IM EI

Fl

ow ChartofTroubl

eshooti

ng

15. CAMERA MODE Enteri

ng Fai

l

Camera M ode Enteri

ng

FAIL

Runni

ng

CAMERA MODE

CAMERA KEY

Damage

Assembl

i

ng or Resource Defect

(REPLACE)

FOLDER Defect(PASS)

Camera IC

REPLACE

OSC401 REPLACE

NO

YES

NO

Check Forei

gn

Substance and

Damage atLCD CON

YES

NO

LCD CON.REPLACE

NO ERROR (PASS)

YES

NO

Fol

der Swap

TEST

Exti

ncti

on

ofOSC

Osci

l

l

ati

on

NO

YES

OSC_EN

Si

gnalCHECK

NO

YES

CAM ERA TEST

END(PASS)

YES

Fl

ow ChartofTroubl

eshooti

ng

16. Vi

brate Fai

l

Vi

brate FAIL

VIB End Ci

rcui

t

CHECK AND

SHORT CHECK

Check Forei

gn

Substance and

Damage atCON.

CONNECTOR CLEAR OR REPLACE

MELODY IC CHECK OR

REPLACE

RFIC Check OR REPLACE

Vi

brate TEST

NO

YES

NO

Fol

der Swap

TEST

YES

NO

FOLDER Defect(PASS)

VIB-EN END R,

C-CHIP

REPLACE

YES

NO

VIB_EN Si

gnal

CHECK

CLK13M_YMU

Si

gnalCHECK

NO

YES

13M Hz_BB

Si

gnalCHECK

NO

YES

END(PASS)

YES

Fl

ow ChartofTroubl

eshooti

ng

17.Battery Cal

i

brati

on Fai

l

Battery Cal FAIL

Low Batt

CHECK

Power INITIAL

CHECK

POW ER ON Repai

r Fl

ow Chart

U102 CHECK OR REPLACE

MAIN CHIP CHECK OR

REPLACE

NO

YES

NO

B'D TEST

Re-aj

ustment

YES

NO

FOLDER Defect(PASS)

FULLRESET Executi

on

YES

VBATT Vol

tage

CHECK

R309,

R310

resi

stance

CHECK

NO

YES

END(PASS)

YES

R309,

R310 REPLACE

YES

Fl

ow ChartofTroubl

eshooti

ng

18.

Transmi

ssi

on and recepti

on No Sound Fai

l

No Sound i

n Transmi

ssi

on

and recepti

on

KEY Sound

Check

Cal

lthe Phone and

Transmi

ssi

on and

recepti

on

TEST

NO ERROR (PASS)

M AIN MIC End Ci

rcui

tR,

C-CHIP

CHECK OR REPLACE

CSP CHECK OR REPLACE

NO

YES

NO

MIC CHECK

BIASE Vol

tage

1.

6V,0.

4V

YES

NO

MIC REPLACE

EAR PHONE Recogni

ti

on CHECK

YES

VCCA Vol

tage

CHECK

CSP VCCA

Power End

CHECK

NO

END(PASS)

YES

M AIN CHIP CHECK OR

REPLACE

YES

NO

Fl

ow ChartofTroubl

eshooti

ng

19.ORFS Fai

l

ORFS FAIL

RAMPING

FAIL

AUTO CALIBRATION Re-

Adj

ustment

RF IC REPLACE

RF IC REPLACE

NO

TX I,

Q Si

gnal

Noi

se CHECK

NO ERROR(PASS)

FINAL GSM RF TEST

YES

VRF Vol

tage

Noi

se and Si

ze

CHECK

RF VCO Power end

Si

gnalCHECK

Noi

se,Di

storti

ng

NO

END(PASS)

YES

PAM REPLACE

NO

MODULATION

FAIL

CSP REPLACE

NO

Compare wi

th PAM

Ampl

i

fi

cati

on and Check

the di

storti

on of

Frequency and waveform