Samsung SGH-E720 Troubleshooting

2. SGH-E720 Flow Chart of Troubleshooting
2-1.Baseband
2-1-1. Power ON
'Power ON' Does not work
Check the current consumption
100mA ?
YES
Check the V bat. voltage
Voltage≥3.3V ?
YES
Check the pins of U401
C415≥1.8V ?
YES
C418 and C419 = 2.8V?
NO
NO
NO
NO
Down load again
Charge the Battery
Check U401 and C415
YES
Checktheclocksignal
at pin #3 of OSC101
Freq.=13MHz,Vrms≥300mV
YES
Check the Initial operation
END
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
C420=1.5V?
YES
2-1
NO
NO
Check U401 and C420
Checktheclockgeneration
circuit (OSC101, F100 pin#4)
SGH-E720 Flow Chart of Troubleshooting
K
K E Y
P
_
S
R
W
O
1
W
_
(
B
0
U
: 5
F
)
K
K
K
K
K
K
K
K
K
K
E
E
E
E
E
E
E
E
E
E
Y
Y
Y
Y
Y
_
_
R
R
O
O
W
W
(
(
5
4
)
)
V B T _ E N
Y
Y
Y
Y
Y
_
_
_
_
_
_
_
_
R
C
C
R
C
R
C
R
O
O
O
O
O
O
O
O
W
L
L
W
L
W
L
W
(
(
( ( 3 )
E A R _ O U T _ S E L
(
3
4
(
2
(
1
(
2
1
0
)
)
)
)
)
)
)
U
P
B
F
A
L
_
S
T
U
M
A
_
B
D
S
S
O
_
I O
L
H
D
D
E
_
_
E
E
O
E
E
T
U
N
P
T
1
_ S E
L
T R I D E N T
H P
B
G
O
1
A
G
R
2
D
G 3
_ H
G 4
O L E
D
E
D
D
D
E
Y
E
E
E
B
_
B
B
B
S
S
C
U
U
U
U
D
D
O
G
G
G
G
S
S
L
_
_
_
_
_
_
(
R
R
C
R
T
T
0
X
X
X
X
T
: 4 )
K E Y _ C O L (
0 )
T
D
D
D
D
S
S
C 2 1 6
O
C
S
2
C
1 7
2 0 1
U
U
U
U
U
S
S
U
U
P
U
P
U
_
P
S
_
P
_
S
C
_
S
D
C
L
D
K
O
S
I
B
X
P
C
R
O
W
R
L
T
K
C
E
I
R
G
3
A
N
_
H
2
L
A
K
K
T
A
Q
E
N
R
E
E
P
M
S S
R 2 0 7
R 2 0 9
R 2 4 1
C 2 1 0
3
G N D
C 2 1 1
S
U
U
S
S
B
S
B
I
S
S
M
B
S
B
B
_
_
I
B
B
_
D
M
S
D
_
_
_
V
_
O
V
U
A
A
R
V
M
V
P
E
T
S
T
S
M
P
O
P
O
A
A
N
T
I
I
D
O
D
V
E
C
A
L
I
L
M
C
E
A
R
_
D
_
_
M
E
D
S
_
_
N
W
B
E
E
T
A
N
I T
E
C
C
C
K
H
T
_ E N
R 2 0 8
4
Y
5
G
V
3
N
C C
D A
B
2
1
U 2 0 4
J I G _ O N
R
3
2
2 4 2
1
Q 2 0 0
B P _ V F
F200
1 V C C
U 2 0 3
O
U
T
2
1 0 0 K
H A L L _ S E N S O R
S I
M C L K
P4
SIMCLK
T2
SIMIO
P5
PIO14_SIMRST
B19
PIO07_USB_SUSP
C19
PIO09_USB_VPI
C18
PIO11_USB_VMI
D17
PIO12_USB_VPO
E16
PIO13_USB_VMO
F16
PIO36_USB_OEN
E17
PIO37_USB_DATA
R3
SPCLK0
R4
SPRXD0
U2
SPTXD0_I2SD
T3
SPFS0
P3
RIO_PIO01
P2
DSR0_PIO02
N4
DTR0_PIO03
N2
RTS0_PIO04
M3
TX0
M1
RX0_IRQ28
M6
CTS0_PIO29
N5
DCD0_PIO44
R16
PIO41_IRDATX
R17
PIO42_IRDARX
K7
TX1
L6
RX1_IRQ28
J7
KEYBRD0
J6
KEYBRD1
J5
KEYBRD2
J4
KEYBRD3
J8
KEYBRD4
H6
KEYBRD5
H4
KEYBRD6
H1
KEYBRD7
H3
KEYBRD8
G6
KEYBRD9
G4
KEYBRD10
H2
KEYBRD11_PSW1_BUF
J15
PIO38_MCI_CLK
J13
PIO08_MCI_CMD
K13
PIO21_MCI_DAT0
L12
PIO22_MCI_DAT1
L13
PIO23_MCI_DAT2
L15
PIO24_MCI_DAT3
L14
PIO39_MCI_CMD_EN
M14
PIO40_MCI_DAT_EN
N14
PIO43_MCI_DAT0_EN
H19
X1RTC
F19
X2RTC
H17
RTCALARMN
G16
OSC32OUT
P15
PIO19_PWRKEEP
P19
PIO20_SYSCLKREQ
G5
PWM1_PIO46
V17
PIO10
V19
PIO25
U16
PIO26
U19
PIO27
W17
PIO28
R13
PIO32
V C C D
V C C D
V C C D
V C C D _ 1 _ 8
U P P E R _ B Y T E
A M P _ S H D N
L
O
N
A
W
E
S
N
R
R
L
E
H
C
A
Y
C
O
C
A
R
_
M
D
_ B
C
U
Y
_
_
C
C
T E
S
S
H
A
B
1
1
1
6
7
7
A
A
A
_
_
_
B
B
C
E
E
S
0
1
7
N
N
N
P
P
P
I
I
I
O
O
O
4
3
3
7
4
3
R
J
U
1
1
1
6
4
8
M
I
U
N
S
_
T
H
B
R
O
_
Q
C
L
O
D
N
P
N
R
P
M
M
_
D
_
E
1
1
W
O
S
_
_
_
C
C
E
C
E
E
N
N
T
S
S
S
D
D
D
D
D
D
D
D
(
(
(
(
(
(
(
(
8
1
9
1
1
1
1
1
)
5
)
0
1
2
3
4
)
)
)
)
)
)
G
A
C
D
C
H
E
F
J
1
1
1
1
1
1
1
1
1
5
6
4
4
5
4
4
5
4
P
A
A
A
A
A
A
A
F L
I
_
_
_
_
_
_
_
O
A
C
C
C
C
C
C
C
3
S
S
S
S
S
S
S
S
0
H
3
0
4
5
6
2
1
_
N
N
N
N
N
N
N
R
W
S
A
T
I T
N
N
A
A
P
P
T
A
T
I
I
M
O
O
T
C
D
S
3
0
K
1
0
_
I
_
_
_
_
P
C
R
I
I
I
I
I
I
I
R
R
R
R
R
R
O
T
T
Q
Q
Q
Q
Q
Q
S
S
4 5
6
5
4
2
3
1
1
1
P
P
L
M
K
P
P
M
M
5
1
1
1
1
1
4
1
1
2
6
2
8
7
9
6
H
N
C
J
C
C
L
Y
A
C
M
A
A
P
P
P
C
D
_
_
_
N
L
U
T
T
T
K
L
C
D
_
D
C
M
_
_
_
I
_
R
S
I
I
I
K
I
S
N
N
N
E
Q
T
T
N
T S O
R
D
B
D
C
A
D
D
E
E
F
1
1
1
1
1
1
1
1
1
1
2
2
2
3
1
4
4
2
2
3
A
A
A
A
A
A
A
A
A
A
_
_
_
_
_
_
_
_
_
_
D
W
O
D
D
D
D
D
D
D
8
9
1
1
1
1
1
1
E
E
0
1
3
4
5
2
N
N
C P T S
A
T
T
S
D
T
O
O
_
P
T
T
T
P
_
D
D
D
D
D
E
E
E
W
C
S
S
S
_
_
_
_
_
K
M
A
A
A
A
A
T
T
T
O
2
3
2
1
0
1
2
3
4
V
T
U
T
T
V
W
W
V
U
1
1
1
1
1
1
3
4
2
3
4
7
3
6
5
D
D
D
D
D
S
S
S
S
S
P
P
P
P
P
C
_
_
_
_
_
P
A
A
A
A
A
_
B
B
B
B
B
T
(
(
(
(
(
0
1
2
3
4
D
)
)
)
)
)
O
C 2 2 0
C 2 2 1
C 2 2 2
C 2 2 3
D (
0 : 1 5 )
D
D
D
D
D
D
D
D
(
(
(
(
(
(
(
(
4
5
6
7
0
1
2
3
)
)
)
)
)
)
)
)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
(
(
(
(
(
(
1
2
2
2
2
2
9
0
1
2
3
4
)
)
)
)
)
)
G
G
G
E
F
1
1
1
1
1
1
1
1
0
2 A
A
A
A
A
_
_
_
_
_
D
D
D
D
D
7
6
3
5
4
D
D
D
D
D
_
_
_
_
_
A
A
A
A
D
5
6
7
8
0
T
V
N
R
U
5
4
6
6
6
D S P _ D B (
0 )
D
D
D
D
S
S
S
S
P
P
P
P
_
_
_
_
A
A
A
A
B
B
B
B
(
(
(
(
5
6
7
8
)
)
)
)
D
A
E
E
E
F
F
F
F
F
4
5
2
4
3
3
9
9
2
8
A
A
A
P
A
A
A
A
A
A
I
_
_
_
_
_
_
_
_
_
O
A
A
A
A
A
A
D
D
D
3
1
2
2
2
2
2
2
0
1
5
9
2
3
4
0
1 _ A
_ A 2 5 _ B O O T S E L
U 2 0
1
D
D
D
D
D
D
D
D
D
D
_ D
_
_
_
_
_
_
_
_
_
D
D
D
D
D
D
D
D
D
1 0
2
3
4
5
6
7
8
9
1
R
T
R
V
U
T
T
R
P
T
7
8
9
6
8
8
8
7
8
9
D
D
D
D
D
D
D
D
D
D
S
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
_
_
_
_
_
_
_
_
_
_
D
D
D
D
D
D
D
D
D
D
B
B
B
B
B
B
B
B
B
B
(
(
(
(
(
(
(
(
(
(
1
6
7
8
9
1
2
3
4
5
0
)
)
)
)
)
)
)
)
)
)
D S P _ A B (
0 : 8 )
V C C D _ 1 _ 8
(
(
(
(
(
(
(
(
(
( 1
9
1
1
1
1
1
1
1
1
4
)
5
0
6
1
7
2
8
3
)
)
)
)
)
)
)
)
)
D
C
B
B
D
D
A
E
E
F
6
8
8
6
3
1
5
3
3
2
A
A
A
A
A
A
A
A
A
A
_
_
_
_
_
_
_
_
_
_
A
A
A
A
A
A
A
A
A
A
1
1
1
9
1
1
1
1
1
1
2
3
4
1
8
0
5
6
7
S
S
P
P
R
C
X
L K
D
1
1
_
_
D
D
D
D
D
P
P
_
_
_
_
_
R
I
I
I
O
O
N
D
D
D
D
D
W
1
1
T
1
1
1
1
1
I O
8
7
N
1
2
3
5
4
0
V
M
P
N
M
N
P
N
T
W
1
6
9
1
8
9
1
1
1
6
5
1
0
8
7
D
D
D
D
D
S
S
S
S
S P
P
P
P
P
_
_
_
_
_
D
D
D
D
D
B
B
B
B
B
(
(
(
(
(
1
1
1
1
1
5
1
2
3
4
)
)
)
)
)
P
P
D
D
D
P
C
C
C
S
S
S
M
M
P
P
P
M
_
_
_
_
_
_
I
R
I
C
O
I
N
O
N
W
L
U
T
K
T
N
D S P _ D B (
0 : 1 5 )
A
A
(
(
7
8
)
)
C
E 7
4 A
A
_
_
A
A
8
7
S P T X D 1
S
_
P
I 2
F
S
S
D
1
_
_
P
P
I
I
O
O
1
1
6
5
N
N
1
1
5
6
P C M _ S Y N C
A N T
3
2 A N T
1 6
1
6
M
I
C
-
A
A
A
A
(
(
(
(
5
6
3
4
)
)
)
)
A
C
D
C
7
6
6
5
A
A
A
A
_
_
_
_
A
A
A
A
4
6
3
5
VDD_CORE8 VDD_CORE7 VDD_CORE6 VDD_CORE5 VDD_CORE4 VDD_CORE3 VDD_CORE2
VDD_CORE1 VDD_IO_1P8_18 VDD_IO_1P8_17 VDD_IO_1P8_16 VDD_IO_1P8_15 VDD_IO_1P8_14 VDD_IO_1P8_13 VDD_IO_1P8_12 VDD_IO_1P8_11 VDD_IO_1P8_10
VDD_IO_1P8_9 VDD_IO_1P8_8 VDD_IO_1P8_7 VDD_IO_1P8_6 VDD_IO_1P8_5 VDD_IO_1P8_4 VDD_IO_1P8_3 VDD_IO_1P8_2 VDD_IO_1P8_1
I
I
O
O
B
B
C
I
I
T
T
K
1
0
O
_
_
_
P
P
I
I
I
A
T
O
O
C
C
0
0
5
6
K
K
N
V
U
N
1
1
1
1
2
1
4
2
D
D
S
S
P
P
_
_
T
T
D
C
I
K
S D S _ T X D
2
3
2
3
9
1
8
0
3
2
2
3
1
9
8
0
M
S
M
P
I
O
C
K
1
T
+
-
5
+
1
1
1
1
5
2
4
3
S
M
S
M
P
P
O
I C
K
K
T
+
1
1
P
N
A (
2 )
D 8
A _ A 2
T D I
V 1 4
T X D
S P K +
A (
1 )
A (
0 )
C 8
A _ A 1
VSSA_U VDDA_U VSSA_D VDDA_D
RESTN
TRSTN
T D O
T 1 2
D
D
S
S
P
P
_
_
T
T
D
M
O
S
S D
J
S
I G
_ R
_ O
X D
N
2
2
7
6 R X D
D
-
1
1
0
1
U
U
S
S
B
B _
_
D
D
-
+
B 7
A _ A 0
VSS18 VSS17 VSS16 VSS15 VSS14 VSS13 VSS12 VSS11 VSS10
VSS1
VRTC
H P /
P O W E R
D +
VSS9 VSS8 VSS7 VSS6 VSS5 VSS4 VSS3 VSS2
2 5
9
U S B _ 5 V
A (
1 : 2 4 )
2
NC2
1
NC1
F18 F17 R11 T11 M12 M11 M10 M9 M8 L8 L7 K8 J12 H12 H11 H10 H9 H8 G9 G8 A18 A2 V13 V7 N18 M2 H18 G2 B13 B8 W18 W8 U12 U5 U1 T18 P1 L16 L4 F1 D18 D9 C14 C1 B16 B12 B6 B4 G18 W12
CKI
G15 W14
TMS
R12
V 2 0 1
D
D
S
S
P
P
_
V
_
R
T
B
W
C
A
N
K
T
2
2
2
3
2
4
G
V
F
N
_
­W
D
B A
E T T
V _ B
G
U
N
S
D
6
6
8
7
C 2 0 2
C 2 0 3
C 2 0 4
C 2
V
0 1
C C D _ 1 _ 5
C 2 0 5
C 2 0 7
C 2 0 8
C 2 0 9
C 2 0 6
R 2 4 3
R
C
S
L K
T
1 3 M _ T R
D
D
D
S
S
S
P
P
P
_
_
_
T
T
R
T
D
M
S
D
O
S
T
I
1
1
2
2
1
9
8
1
0
7
T
T
T
T
T
D
M
C
R
D
O
K
S
S
I
T
C N 5 0 6
3
2
5
4
1
1
2
5
3
4
V C C D _ 1 _ 8
V R T C
J T A G
F
O
L
2-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2-1-2. Initial
SGH-E720 Flow Chart of Troubleshooting
Initial Failure
The voltage at the C415=1.8V?
The voltage at the C419=2.8V?
YES
ThevoltageattheZD405
" Low --> High" ?
YES
There is 32.768KHz wave
form at the C216, C217 ?
YES
The voltage on R412 is
"Low --> High" ?
NO
NO
NO
NO
Check the U401
(If it has some problem,
it has to be replaced.)
Check the U401
(If it has some problem,
it has to be replaced.)
Check the U201
Check the U201
YES
The voltage is 2.8V
at the C416,C418,C419 ?
YES
LCD Display OK ?
YES
Sound operation OK ?
YES
END
2-3
NO
NO
NO
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Check the U401
Check the LCD part
Check the Audio part
SGH-E720 Flow Chart of Troubleshooting
AFC
VAPC
RTXIP
RTXIN RTXQP RTXQN
C 4 5 8
CLK32K XOENAQ
DSP_INT
JIG_ON
PWR_ON
PSW1_BUF
R 4 1 2
Z D 4 0 5
AOUTAP AOUTAN
AOUTBP
AOUTBN
MICOUTP MICOUTN
AUXINP
AUXINN AUXOUTP AUXOUTN
P
R
I
N
W
S
T
T
R
R
_
Q K E E P
C428
MICINP MICINN
V I
B _ E N
NC6
NC5 GNDS17 GNDS16 GNDS15 GNDS14 GNDS13 GNDS12 GNDS11 GNDS10
GNDS9 GNDS8 GNDS7 GNDS6 GNDS5 GNDS4 GNDS3 GNDS2 GNDS1
GNDV
VDDV GNDB VDDB GNDD VDDD
VSS4
VSS3
VSS2
VSS1
VDD3
VDD2
VDD1
GNDQ
VDD67
VDD5
V D D 1 2
J 1 3
D S P _ D B (
0 :
1 5 )
2 1 K10 J10 J9 J8 J7 H9 H8 H7 H6 G10 G9 G8 G7 F10 F9 F8 F7 D13
B4 C4 P13 L11 F6 A6 M10 N11 P6 R2 K4 G5 J4 N5 N6 M3 J3 F11 K15 B15 E8 B13 C10
V D D 3 4
C 1 1
C 4 0 4
S
S
I
I
M
M
_
_
C
R
L
S
K
T
C 4 0 6
C 4 0 7
C 4 0 8
C 4 0 9
C 4 0 5
2
3
2
3
G 1 0
G 9
G 8
G
5
4
7
4
S I
M _
I
O
E A R _ C H E C K
C 4 0 1
C 4 0
C
2
4 0 0
C 4 0 3
V B A T
V S I
M
1
1
C N 4 0 1
6
5
6
V R F
V C C A
V C C D _ 1 _ 8
V C C D
D S P _ A B (
T X _ B A
S
S
P E R C L K
C 2
S E R C
D9
K
AFC
E7
TXP
B5
RAREF2
B6
RAREF1
D7
RXTXIP
D6
RXTXIN
C7
RXTXQP
C6
RXTXQN
P11
AOUTAP
N12
AOUTAN
R12
AOUTBP
P12
AOUTBN
N14
MICINP
M14
MICINN
N15
MICOUTP
P15
MICOUTN
M15
AUXINP
L14
AUXINN
K13
AUXOUTP
L13
AUXOUTN
R13
VXVCM
M13
VREGP
R14
VREGN
R4
DAICK
P4
DAIRN
L6
DAIDI
M6
DAIDO
N4
RTC_CLK
D1
XOENAQ
R6
MC
P5
NC7
P3
DINTR
C14
PWR_SW2
C15
PWR_SW1N
L7
PSW1_BUF
K9
RESET_O
N10
MODE
M9
PWR_KEEP
L10
INTRQ
L9
VIB_RNG_EN
R T C _ A L M N
H 1 0
C 4 2 6
C 4 2 7
V B A T
R T C A L A R M
R 4 1 4
N
E
A
S
R
D
R
C
E
F
_
D
R
S
_
_
E
E
A
E
L
N
N
E
L
T
G
A
B
A
B
C
3
3
6
2
1
1
O
O
O
S
S
S
E
E
E
C
C
C
R
R
R
T
T
T
L
L
D
L
L
L
E
E
7
6
5
A
2
1
A
A
D
D
C
C
C
C
H
H
_
_
_
C
A
A
V
_
I
S
R
R
R
U
U
E
E
E
E
X
X
N
S
F
F
1
2
E
F
D
A
D
E
1
9
1
1
1
1
2
0
4
0
5
R 4 0 7
R 4 0 6
B P _ V F
C 4 5 7
T
R
H
4
1
1
0
3
1
C 4 5 6
P C S _ R X _ E N
A
E
F
5
5
4 O
O
O
C
C
C
T
T
T
L
L
L
4
3
2
C H _ B
V
V
D
B
E
R
A
X
V
T
T
E
E
E
1
1
1
1
3
4
V C C B
F L A S
D
H
S
_
D
P
R
_
S
E
R
P
S
W
_
E
I
O
N
T
D S P _ A B (
0 )
C
R
K
E
L
L
2
6
3
5
3
6
O
R
R
O
I
A
|
O
W
E
B
C
C
S
0
T
T
N
E
L
L
1
0
T N _ C S P
S
S
C
C
S
D
S
L
D
O
N
K
I
V
_
_
_
_
A
P
P
P
P
C
S
S
S
S
C
C
C
C
C
K
M
N
L
F
8
1
8
7
7
4
U
U
U
U
P
P
P
P
_
_
_
_
S
S
S
C
D
D
C
S
O
I
L K
V B A T
V C C B
C 4 1 5
C 4 1 6
C 4 1 7
C 4 1 8
C 4 1 9
C 4 2 0
C 4 2 1
NEG POS
D
D
D
D
D
D
D
S
S
S
S
S
S
S
P
P
P
P
P
P
P
_
_
_
_
_
_
_
A
A
A
A
A
A
A
B
B
B
B
B
B
B
(
(
(
(
(
(
(
7
6
5
4
3
2
1
)
)
)
)
)
)
)
M
M
N
N
K
P 1
A B 1
V L D O _ 1
G 1 1
M 4
0 0
K
L 5
1
2
1
2
7
5
A
A
A
A
A
A
A
B
B
B
B
B
B
B
5
2
6
3
4
7
8
U 4
0 1
V
V
V
V
V
V
L
L
L
L
L
L
D
D
D
D
4
4
S
S
O
O
O
O
_
_
_
_
_
_
A
B
4
2
3
5
A
B
J
A
B
B
1
1
1
1
1
1
2
2
1
3
0
2
G
D C
S
S
M
_
_
T
T
X
X
_
_
E
E
N
N
C 4 1 4
R 4 0 5
0 :
8 )
D S P
D
D
D
D
D
D
_ A
S
S
S
S
S
S
B
P
P
P
P
P
P
(
_
_
_
_
_
_
8
D
D
D
D
D
D
)
B
B
B
B
B
B
(
(
(
(
(
(
0
5
4
3
1
2
)
)
)
)
)
)
K
K
H
K
J
J
3
5
6
1
5
2
D
D
D
D
D
D
D
B
B
B
B
B
B
B
2
3
4
5
1
0
6
D
D
D
D
D
D
D
D
D
D
S
S
S
S
S
S
S
S
S
S
P
P
P
P
P
P
P
P
P
P
_
_
_
_
_
_
_
_
_
_
D
D
D
D
D
D
D
D
D
D
B
B
B
B
B
B
B
B
B
B
(
(
(
(
(
(
(
(
(
(
1
9
7
8
1
6
1
1
1
1
2
)
)
)
1
)
0
5
3
4
)
)
)
)
)
G
G
3
4
D B 7
)
D
D
E
E
F
F
F
F
3
2
3
1
2
4
3
2
D
D
D
D
D
D
D
D
B
B
B
B
B
B
B
B
1
1
1
1
1
1
9
8
4
5
3
2
1
0
AUX_ADC3
GND_OCTL
VDD_OCTL
VDD_IO2 VDD_IO1
GND_HCUR
GND_PSC2
L
L
R
E
E
I
V
N
D
D
V
V
V
V
I
G
B
L
1
2
L
L
L
5
5
S
S
_
_
A
B C
D
9
1 0
V
_
_
_
_
D
D
D
D
D
D
R
O
O
R
R
R
R
T
_
_
C
V
V
V
V
7
6
C
F
F
H
G
G
A
1
1
1
1
1
1
1
5
3
2
4
1
3
2
V
M
K
K
S
E
E
O
I
Y
Y
M
T
_
_
B
B
L
L
2
1
V C C B
V C C D _ 1 _ 8
V C C A
V R F
V C C D
V C C D _ 1 _ 5
GND_PSC1
S
S
U
U
I
I
M
S
M
P
P
U
I
_
_
_
_
M
V
P
C
C
R
R
S
_
_
L
L
S
S
I
I
I
M
O
O
K
K
T
T
N
P
R
J
K
K
K
1
1
9
1
1
1
1
1
0
0
4
1
2
S
S
S
S
S
S
I
I
I
I
I
I
M
M
M
M
M
M
C
_
R
_
D
_
R
I
C
L
S
A
O
S
L
K
T
T
K
T
A
V R T C
2-4
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2-1-3. Sim Part
"Insert SIM" is displayed on the LCD
SGH-E720 Flow Chart of Troubleshooting
The voltage is 2.8V
at the pin #1 of CN401?
YES
Is there any signal
pin #2,3,4 of CN401 ?
YES
Check the SIM Card
NO
Check the U401
NO
Check the U401 & U201
END
2-5
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
SGH-E720 Flow Chart of Troubleshooting
2-1-4. Microphone Part
Micro-phone does not work
Is the assembled status of
Microphone O.K?
YES
Check the DC bias voltage o n
Mic p ath.
The voltage of C437 is
about 2.2V±10%?
YES
Is microphone OK?
YES
NO
NO
NO
Reassemble the microphone
Solder the microphone again
or Replace
C437,C438,R428,R430,R433
Check U401
END
2-6
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Loading...
+ 12 hidden pages