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SGH-D720 Flow Chart of Troubleshooting and Circuit Diagrams
2-
10
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2-1-3. Sim Part
YES
YES
YES
YES
Check the SIM
connector's
(SIM500)
Check the circuit related to
U
500
NO
resolder or change
SIM500
NO
Check the related circuit of
SIM500
NO
Phone can't access
SIM card
Check the circuit around
U500 output
and voltage supply circuitry
END
Check the pin 1 of
SIM500
Voltage = 3V
Check the circuit around SIM500
input circuitry
Check the related circuit of
U500
NO
C502
C505
VCCD
7
G G
8 9
G G
10
SIM500
1
1
2
2
3
3
4 4
5
5
6 6
C507
C506
H11
K12
1
OI
_
D
D
V
UP_IO
R10
UP_RST
3
J
1
D
D
V
J13
VDD12
3
M
2
D
D
V
6
N
3
D
D
V
VDD34 C11
01
C
5
D
D
V
31
B
76
D
D
V
K14
SIM_CLK
J11
SIM_IO
K11
SIM_RST
N9
UP_CLK
P10
11
F
R
U
C
H_
D
N
G
51
B
1
C
S
P_
D
N
G
51
K
2
C
S
P_
D
N
G
8
E
Q
D
N
G
C510
VBAT
C503
C509
C508
SIMRST
SIMCLK
SIMDATA