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DUAL BAND Mobile
ELECTRONICS
Cellular Phone
SGH-A288/SGH-A200
SERVICE Manual
DUAL BAND MOBILE CELLULAR PHONE CONTENTS
1. Exploded Views and Parts List
2. PCB Diagrams
3. Electrical Parts List
4. Block Diagrams
5. Flow Chart of Troubleshooting and
Circuit Diagram
F
C DE
C
AB MN
O
L
JK YZ
WX
I
GH V
TU
S
PQR
5. Flow chart of trouble shooting and Circuit Diagram
5-1 Power ON
'POWER ON'does not work
Yes
Check the Battery Voltage No
Charge the Battery
is more than 3.2V
Yes
The node No Check U116 and the path from +VBATT
between D110 and BAT101 = 3V ?
to BAT101
Yes
No
U117 pin 1,4,10 > 3.2V Check the circuit related to U117
Yes
No
U463 pin 1, 3 = "H"? Check the circuit related to U463
Yes
No
U463 pin5, 7 = 2.9V ? Check U463 and related circuit
Yes
No
Check the clock generation circuit
Check for the clock signal at R301
(related to U303 and U301)
Yes
Check the initial operation
END
5-1 Flow chart of trouble shooting and Circuit Diagram
U116
1 5
+VBATT VINVOUT RTC_3V3
2 GND
3 BYPASS 4 C208
C699 ON/OFF C211
RTC_VCC
C190
1
C713
BAT101
L102 D108
3.3V
2
U117 C209 C202
R164
1 FB OUT 10
2 LBI LX 9
3 _LBO GND 8 VCC AVCC
4 CLSEL BATT 7 U463
5 4
Flow chart of trouble shooting and Circuit Diagram
5 REF _SHDN 6 PS1 GND
6 3
PS2/3 VO1
C746 7 2
C203 NO VO2
8 1
VIN VO3
C328 C555
C535 C700 C708
One Point Contact
One Point Contact
D107
1
BB_PWR
3
2 ON_OFF
4
5
C701 RTC_3V3
R567
3 R157
DCIN 1
DCVOLT
R166 C186 R167 R168
2
U111
R161
5-2
5-2 Initial
Initial Failure
No Check and repair the important
U103 pin 4 = "H" ?
signals of U108 as follows
Yes
The node No
between R162 and C183 Check U112
= "H" (RST)
Yes
No
R114 = "H" (BOOT) Resolder R114
Yes
Check all the other connection
by Test S/W
No
R673 = "H" (MSIZE) Resolder R673
Yes
Check the circuit around LCD
No
R165 = "L" (EXTPROC) Resolder R165
Check the circuit
around U107(EEPROM)
and data stored in it
Replace PBA
END
5-3 Flow chart of trouble shooting and Circuit Diagram
U108
U109 VCC
U645
Q108
R162
SYSRST
6 F_BE0 F_WP
C183 F_VCCW
R156
VCC
Flow chart of trouble shooting and Circuit Diagram
4 F_BE1 R163
VCC R673
GPIO4 MSIZE
R114
SIMPWDN_BOOT GPIO3
DTR1 F_WP
5-4
5-3 Charging Part
Abnormal charging part
Yes
No
Check the CN502 pin 17,18 5.2V ? Replace TA
Yes
No
Check the U639 pin 3 5.2 V ? Resolder C111, L632, C710
Yes
No
U639 pin 4 = "L" ? Resolder R328
Yes
No
Resolder components around
Check the U639 pin 5 4.2V ?
U639
Yes
END
5-5 Flow chart of trouble shooting and Circuit Diagram
+VBATT
Q303 R320
3
U639 1
BAT_VOLT
1 6 2
ISENSE DRIVE
Flow chart of trouble shooting and Circuit Diagram
2 5 R671 C704
L632 GND VSENSE
DCVOLT 3 VCC PROG
4
C111 C710 ICHRG
R328
L:ON,H:OFF
CHG_ON
5-6
5-4 Sim Part
Phone can't access SIM card
Yes
No
R699 = 2.9 V ? Check the circuit related to U463
Yes
No
Check the circuit related to
U463 pin1 = 3 V ?
R421, R428, U649
Yes
No
U101 pin6 = 3 V ? Resolder R103
Yes
No
U101 pin 5 = "H" ? Replace the PBA
Yes
No
U101 pin 2, 3 = 3 V ?
Replace U101
Yes
No Resoldering CN102
CN102 pin 1, 5 = 3 V ? and check open connection
from U101 to CN102
Yes
After Power ON, No
Check SIMCLK Signal on CN102 pin 3 Replace PBA
in a few second
Yes
No
After SIM card insert,
CN102 pin 2 = "H(SIMRST) ? Replace the PBA
Yes
Check the circuit around U107
(Serial EEPROM) and data stored in it
END
5-7 Flow chart of trouble shooting and Circuit Diagram
VCC SIM_VCC SIMDATA
C751
R698
R699 U101
Flow chart of trouble shooting and Circuit Diagram
U649
6 1 R103 3
4 VIN,R1
VIN VOUT V.C1-2
5 C1+ 2 5 ON/OFF 2
GND CN102
C423 V.C1-1 1
4 3 6 R1,C1
R2 1 C1 C5 4
C1- MODE C745 C107
C424 C104 SIMRST
2 C2 C6 5
3 C3 C7 6
FDG6323L SIMCLK
R421
SIM_5V3V
C749 C750 C748
SIMPWDN_BOOT
R428
SIMALIM
5-8
5-5 Microphone Part
Microphone does not work
Yes
Check No
Resolder CN503 pin 10, 11 and
the connection
ZD109, ZD112
from CN503 pin 10, 11
Yes
No
U113, U115 pin 2 (AVCC) 2.9V? Check the circuit related to U463
Yes
No
Check the circuit Resolder the R174, R175, R176,
from U108 to U113, U115 R177, C187, C188 and C204
Yes
No
Check the Key PCB Replace the Key PCB
Yes
END
5-9 Flow chart of trouble shooting and Circuit Diagram
CN503
10
ZD112
11
ZD109
AVCC
Flow chart of trouble shooting and Circuit Diagram
U115
AVCC
6
AVCC U108
U463 2
R177
R176 C188
5 VXI1P
3
U113
R175 C187
5 VXI1N
R174
2
6
5-10
5-6 Speaker Part
Speaker does not work
Yes
No
J101 pin 2, 3 = short Resoler J101
Yes
No
J101 pin 2, 3, 6 = 1.5V? Replace the PBA
Yes
No
CN 105 pin 22, 23 = 1.5V? Resolder CN105
Yes
Check No
the depression of Modify the SPK pins
the SPK pins
Yes
No
Is Speaker working? Replace the Speaker
Yes
END
5-11 Flow chart of trouble shooting and Circuit Diagram
5-7 Key Data Input
Check Initial operation
Yes
Are No
the pin 19,20,21,22 and 23 Replace the PBA
of CN503 low?
Yes
When
No
one of the keys is pushed, Resolder pin 19,20,21,22 and 23
one of pin 19,20,21,22 and 23 of of CN503
CN503 is high ?
Yes
No
Key PCB is OK ? Replace the Key PCB
Yes
END
Flow chart of trouble shooting and Circuit Diagram 5-12
5-8 Alert Tone
Abnormal Alert tone
No
Is there alert wave form on the
ALERT by Test S/W
R110 during alert tone test?
Yes
No
Is there alert wave form on the
Check the circuit related to Q102
Q102 pin 3 during alert tone test?
Yes
No
U116 pin 5 3.3V? Check the circuit related to U116
Yes
No
Buzzer is ok? Change the Buzzer
Yes
END
5-13 Flow chart of trouble shooting and Circuit Diagram
RTC 3V3(From U116 pin5)
BUZ+
C102
D104
Flow chart of trouble shooting and Circuit Diagram
Q102 BUZ-
R110 3
1
From IC
2
R109
5-14
5-9 Ring Indicator
Ring Indicator LED does not
work
No
Q101 pin 2 = "H"? GPO2 by Test S/W
Yes
No
Q101 pin 3 = "L"? Replace Q101
Yes
No
CN503 pin 3 = "L"? Resolder CN503, LED
Yes
No
Key PCB is OK? Replace the Key PCB
Yes
END
5-15 Flow chart of trouble shooting and Circuit Diagram
KPCB A'SSY
CN503
3 Q101
R706
(From U108)
RI_LIGHT
Flow chart of trouble shooting and Circuit Diagram 5-16
5-10 Back Light
Backlight does not work
No
Backlight "ON" mode
Select backlight "ON" mode
in the menu?
Yes
No
R141 = "H" ? GPO1 by test S/W
Yes
LCD BACKLIGHT KEY PCB LED
No
Check the
Check the CN105 pin 17 = "H" ?
CN105 pin 17
Yes
No
LCD backlight on ? Replace EL sheet
Yes
No
Resolder R141, R149 Q107 pin 1 = "H" ?
END
Yes
No
Resolder Q107 Q107 pin 3 = "L" ?
Yes
No
Resolder CN503
Key PCB LED on ?
or Replace Key PCB
Yes
END
5-17 Flow chart of trouble shooting and Circuit Diagram
5-11 GSM Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U304 No Check RF connector
Pin 2
-> resolder
-65 dBm
Yes
Check
U304 No Resolder & No VC1 : L
Pin 9 U304 Pin 9
VC2 : L
-65 dBm -65 dBm
VC3 : H
Yes Yes
U603 No Resolder
Pin 7 U603
-70 dBm
Yes
F303 No Resolder
Pin 2 L613, L635, L639, C695
-60 dBm
Yes
U305 No Resolder
Pin 53, 54 F303, C333
-60 dBm L323, L324
Yes
Check
U305 C301(CH+225MHz)
Pin 49, 50 No No Resolder
-20 dBm
(225 MHz) U302
C315(1080MHz)
-50 dBm -20 dBm
Yes Yes
U305 Resolder
Pin 43, 44 No
U601,C309,C310,C312
(45 MHz) C313,C314,C400,R700
-55 dBm
Yes
U305 No Resolder
Pin 24, 25, 26, 27 OneC(U108), U305
40 mV
Yes
Check U305 No Resolder
Pin 32, 33 2.5 V U305 (Pin35, Pin 32, 33)
Pin 35 0.5 V
Yes
Resolder
U108
Flow chart of trouble shooting and Circuit Diagram 5-18
5-12 GSM Transmit
Tx On (level : 5)
U304 Yes Resolder
Pin 2
J301
30 dBm
No
Check
U304 Yes VC1 : H Yes Change or Resolder
Pin 7 VC2 : L U304
30 dBm VC3 : L
No No
Check
Yes Ant. S/W, Control Circuit
U312 Resolder
Pin 4
U318, C353
30 dBm
No
Check
U312 Yes U312 : +VBATT Yes Resolder or
Pin 1 Pin 2 (APC) Change U312
0 dBm OK?
No Check +VBATT
No or APC Control
U200 Yes Resolder or Change
Pin 6 C698, R335, R364, R366
7 dBm
No
U200 No
Pin 7 0.5 V
Resolder
Pin 5 2.8 V U108, U457, U200
Pin 3 = 0.5~2.5 V
Yes
U305 No Resolder
pin 30, 47
U302
-10 dBm
Yes
U305 No Resolder
Pin 17, 18, 19, 20 OneC(U108)
40 mV
Yes
Check U305 No Resolder
Pin 38 2.5 V U305 (Pin35, Pin38)
Pin 35 0.5 V
Yes
Resolder
U108
5-19 Flow chart of trouble shooting and Circuit Diagram
5-13 DCS Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U304 No Check RF connector
Pin 2
-> resolder
-65 dBm
Yes
Check
U304 No Resolder & No VC1 : L
Pin 16 U304 Pin 16
VC2 : L
-65 dBm -65 dBm
VC3 : H
Yes Yes
U603 No Resolder
Pin 5 U603
-70 dBm
Yes
F302 Resolder
Pin 2 C627, C724, C725, L636
-60 dBm
Yes
U305 No Resolder
Pin 2, 3 F302, C335
-60 dBm L638, L637
Yes
Check
U305 C301(CH-225MHz)
Pin 49, 50 No No Resolder
-20 dBm
(225 MHz) U302
C315(1080MHz)
-50 dBm -20 dBm
Yes Yes
U305 Resolder
Pin 43, 44 No
U601,C309,C310,C312
(45 MHz) C313,C314,C400,R700
-55 dBm
Yes
U305 No Resolder
Pin 24, 25, 26, 27 OneC(U108), U305
40 mV
Yes
Check U305 No Resolder
Pin 32,33 2.5 V U305 (Pin 35, Pin 32, 33)
Pin 35 2.5 V
Yes
Resolder
U108
Flow chart of trouble shooting and Circuit Diagram 5-20
5-14 DCS Transmit
Tx On (level : 0)
U304 Yes Resolder
Pin 2
J301
25 dBm
No
Check
U304 Yes VC1 : L Yes Change or Resolder
Pin 13 VC2 : H U304
25 dBm VC3 : L
No No
Check
Ant. S/W, Control Circuit
U312 Yes Resolder
Pin 5 U318, C364
25 dBm
No
Check
U312 Yes U312 : +VBATT Yes Resolder or Change
Pin 8 Pin 2 (APC) U312
0 dBm OK?
No No Check +VBATT
or APC Control
U200 Yes Resolder or Change
Pin 10 C697, C346, R365, R363
10 dBm
No
U200
Pin 7 2.5 V No Resolder
Pin 5 2.8 V
Pin 3 = 0.5~2.5 V U108, U457, U200
Yes
U305 No
pin 30, 47 Resolder U302
-10 dBm
Yes
U305 No Resolder
Pin 17, 18, 19, 20 OneC(U108)
40 mV
Yes
Check U305 No Resolder
Pin 38, Pin 35 U305 (Pin35, Pin38)
2.5 V
Yes
Resolder
U108
5-21 Flow chart of trouble shooting and Circuit Diagram
R312
10
XVCC
C319
10NF
C305 L303
5.6NF 27nH
U303
R313
1K 1 4
AFC VT VCC
R308
2 3 1K
GNDOUT
C320
10NF C306
10NF
U301
4 3
5
2 C302
R305 R301
1K 1.5K 1NF
6 1
CLK13M
UMZ1N-TR
R304
R303
1K
3VRF
Flow chart of trouble shooting and Circuit Diagram
R302
R311
0 0
C304
100NF C303
100NF
C316 C308
100NF 100NF
L301 C301
560PF
2.2nH
RFLO
14 13 12 11 10 9 8
C307
NC
NC
1NF
GNDR
VDDR
15 7
PWDNB
RFOUT
XIN GNDR
AUXOUT
16 6
GNDD RFLA
17 5
VDDD RFLB
18 4
GNDD U302 GNDR
19 SI4133-MLP28 3
IFLA RFLC
20 2
IFLB RFLD
21 1
NC NC
VDDI
IFOUT
GNDI
SCLK
SDAT
SENB
GNDR
GND
22 23 24 25 26 27 28 29
L304 C315
10nH 560PF
IFLO
R310
1.5K
SYNEN1
SCLK
SDATA
5-22
5-23
RFLO
AGC_EN
SCLK
SDATA 3VRF
R370 C337 C344
22 C321
27PF 1NF L305 L306