Samsung SGH-E720 Service Manual
GSM TELEPHONE
SGH-E720
GSM TELEPHONE
CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded Views and Parts List
4. Electrical Parts List
5. PCB Diagrams
6. Block Diagrams
1. SGH-E720 Specification
1-1. GSM General Specification
GSM900
Phase 1
Freq. Band[MHz]
Uplink/Downlink
ARFCN range 1~124
Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz
Mod. Bit rate/
Bit Period
Time Slot
Period/Frame
Period
Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
890~915
935~960
270.833kbps
3.692us
576.9us
4.615ms
EGSM 900
Phase 2
880~915
925~960
0~124 &
975~1023
270.833kbps
3.692us
576.9us
4.615ms
DCS1800
Phase 1
1710~1785
1805~1880
512~885 512~810
270.833kbps
3.692us
576.9us
4.615ms
PCS1900
1850~1910
1930~1990
270.833kbps
3.692us
576.9us
4.615ms
Power Class 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm -100dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km -
1-1
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This Document can not be used without Samsung's authorization
SGH-E720 Specification
1-2. GSM TX power class
TX Power
control level
5 33±2dBm
6 31±2dBm
7 29±2dBm
8 27±2dBm
9 25±2dBm
10 23±2dBm
11 21±2dBm
GSM900
TX Power
control level
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
DCS1800
TX Power
control level
0 30±3dBm
1 28±3dBm
2 26±3dBm
3 24±3dBm
4 22±3dBm
5 20±3dBm
6 18±3dBm
PCS1900
12 19±2dBm
13 17±2dBm
14 15±2dBm
15 13±2dBm
16 11±3dBm
17 9±3dBm
18 7±3dBm
19 5±3dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
7 16±3dBm
8 14±3dBm
9 12±4dBm
10 10±4dBm
11 8±4dBm
12 6±4dBm
13 4±4dBm
14 2±5dBm
15 0±5dBm
1-2
15 0±5dBm
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This Document can not be used without Samsung's authorization
2. SGH-E720 Flow Chart of Troubleshooting
2-1.Baseband
2-1-1. Power ON
'Power ON' Does not work
Check the curren t consumption
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
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S
T
U
M
A
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B
D
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S
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1
A
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2
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3
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4
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D
D
D
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Y
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B
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B
B
S
S
C
U
U
U
U
D
D
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G
G
G
G
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C
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T
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0
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X
X
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4
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K
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Y
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(
0
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D
D
D
D
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C
2
1
6
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1
7
2
0
1
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U
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2
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2
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1
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2
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3
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2
1
1
S
U
U
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B
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C
C
K
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2
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5
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3
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B
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2
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4
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3
2
2
4
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1
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2
0
0
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P
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F200
1
V
C
C
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2
0
3
O
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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
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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 on
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
SGH-E720 Flow Chart of Troubleshooting
A
U
D
I
O
_
M
M
E
L
O
D
Y
C
4
R
3
4
7
A
U
A
X
U
O
X
U
I
N
T
N
N
C
4
5
3
R
4
C
5
4
5
7
2
A
U
A
X
U
O
X
U
I
N
T
P
P
C
4
4
6
R
4
C
3
6
4
6
9
2
8
C
4
3
8
M
M
I
I
C
M
C
V
O
C
U
C
T
A
N
C
4
3
5
C
4
3
6
C
4
6
6
M
O
I
I
C
C
U
I
I
N
N
T
N
P
P
R
4
R
C
2
4
4
4
5
6
7
5
-
C
4
4
5
6
7
R
ZD406
V400
V401
ZD402
C
4
6
8
V403
V404
R
4
4
2
2
2
R
4
5
4
C
4
4
7
C
4
5
2
C
4
4
8
C
4
4
9
C
4
5
0
C
4
5
1
E
A
R
_
C
H
E
C
K
R
4
7
3
1
0
1
G
1
1
0
1
G
2
1
G
3
1
G
4
G
1
8
R
4
3
4
C
4
4
1
R
4
5
3
R
4
3
3
J
H
A
P
C
E
E
O
K
A
A
U
_
R
R
I
T
N
_
_
R
C
4
4
0
L
4
0
2
E
A
R
_
S
W
I
T
C
H
2
1
3
5
4
9
7
8
6
2
4
8
6
1
3
5
9
7
C
N
4
0
G
G
1
1
7
6
0
G
1
5
L
T
L
C
4
3
9
L
4
0
1
C
4
6
7
R
4
5
8
R
4
3
0
H
P
O
U
T
R
C
C
4
4
7
7
4
5
1
1
U
U
F
F
V
C
C
D
_
1
R
_
4
8
2
9
R
4
2
3
C
4
3
4
C
4
3
3
V
C
C
D
_
1
_
8
3
.
3
V
_
S
W
_
A
K
1
C
C
4
3
4
3
0
2
C
4
6
4
M
I
C
+
M
I
C
-
Y
M
U
_
R
I
R
M
I
C
4
0
0
S
Q
T
C
4
2
5
C
4
2
4
V
C
C
D
C
4
2
3
8
C
4
6
1
R
4
7
1
E
A
A
O
R
U
_
T
R
B
P
C
L
K
1
3
M
_
Y
M
U
R
4
0
4
C
4
2
2
O
A
E
U
O
L
S
T
U
O
P
_
T
K
D
S
A
E
1
Y
N
N
L
+
R
4
1
0
S
P
K
1
P
5
1
2
4
3
2
2
2
1
1
1
D
2
N
N
-
S
S
2
2
C
C
2
1
I
N
2S2
GND
3S1
3
-
D3
4
3
I
N
S
2
1
9
0
C
4
6
2
E
R
A
O
R
U
_
T
O
U
T
_
S
E
L
C
P
_
O
A
E
(
0
N
)
3
3
3
3
1
4
2
0
G
I
/
A
O
R
0
D
V
1
D
D
/RST
CLKI
2
LED
3
/IRQ
4
5
NC
6
PLLC
7
VDD
H
8
P
O
U
VSS
T
H
9
L
P
/
O
M
VREF
U
O
E
T
N
Q
-
O
R
G
1
1
1
1
3
0
2
5
1
R
4
0
3
H
H
P
P
O
O
U
U
T
T
-
-
L
R
C
4
1
2
C
4
1
1
1
7
GND
1
6
D1
U
1
5
4
0
3
1S1
1
4
V+
1
3
4S2
4
D
S
4
1
1
1
1
2
R
4
7
2
2
0
0
A
E
L
O
A
O
R
U
T
B
N
V
C
C
D
_
1
_
8
Y
M
U
_
C
S
2
9
/
C
S
U
4
0
2
E
Q
2
1
3
C
4
1
3
C
4
1
0
R
4
0
2
U
_
T
L
C
P
_
W
D
D
E
(
(
1
0
N
)
)
2
3
2
2
8
6
3
7
/
G
D
D
W
0
1
2
R
5
D2
2
4
D3
2
3
D4
2
2
D5
2
1
D6
2
0
D7
1
9
MTR
1
8
SPOUT2
1
7
SPOUT1
S
S
P
P
V
V
E
D
S
Q
D
G
S
3
1
3
1
1
6
4
5
6
R
4
0
1
V
B
A
T
A
O
U
T
A
P
R
4
6
4
C
4
4
4
C
4
6
3
F
4
0
0
3
.
3
V
_
S
W
_
A
K
D(2)
D(3)
D(4)
D(5)
D(6)
D(7)
VIB_EN
MSPK+
MSPK-
2-7
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SGH-E720 Flow Chart of Troubleshooting
2-1-5. Speaker Part
There is no sound from speaker
Is the terminal of speaker O.K?
YES
Are there any signal
at the pin #40,42 of CN507?
YES
Thetypeofsoundfrom
YES
Are there any signal
at the pin #1,5 of U403?
Pin #2 of U403
is Low?
the speaker is Melody?
NO
NO
NO
NO NO
NO
Check
U402,
U401,
U201
Replace the speaker
Check the LCD module
&ReplaceCN507
NO
Are there any signal
at the pin #3,15 of U403?
YESYES
Pin #2 of U403
is High?
YES
Pin 14 of U403
is 3.3V?
NO
Pin 3 of U303
is High?
NO
Check U401
END
YES
Check U403
YES
Check U303
2-8
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This Document can not be used without Samsung's authorization
YES
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