How it Works
Samsung
Loading...
S3770
Service Manual
3 pgs2.21 Mb0
Disassembly and assembly Instructions 6
4 pgs282 Kb0
Specification 2
17 pgs1.92 Mb0
Block Diagram 7
50 pgs3.91 Mb0
Electrical Parts List 11
5 pgs62.27 Kb0
COVER 1
2 pgs80.45 Kb0
EVAPL 3
1 pgs311.44 Kb0
Parts list 4
1 pgs10.73 Kb0

Samsung S3770 Block Diagram 7

Level
8.
8-1.
1
0
1
M
A
P
M
A
P
7
5
7
5
4
Y
K
S
Repair
3
o
(
-
S
T
_
T
8
A
V
3
B
V
X
R
1
T
_
B
1
F
0
0
2
3
G
1
B
X
F
D
0
0
9
0
5
B
A
1
P
F
Y
G
A
A
S
X
8
_
R
T
B
6
F
1
0
0
3
G
8
B
X
F
D
7
B
6
7
5
S
G
/E
A
_
P
S
C
D
P
M
A
_
R
V
W
A
_
S
L
B
M
S
G
F
I
R
E
L
T
0
0
2
Y
8
M
1
M
R
F
S
M
S
G
W
A
S
_
B
H
F
I
R
E
L
T
0
0
2
Y
4
2
M
G
R
F
S
T
U
_
O
A
1
_
P
B
3
A
T
U
_
O
A
8
P
_
B
3
8
G
B
P
2
0
-5
M
P
C
A
W
I
I
F
&
2
4
M
X
G
A
_
P
M
P
_
8
X
5
0
_
R
M
S
M
_
8
X
5
0
_
R
/
G
P
_
9
X
0
0
_
R
M
S
/
M
_
9
X
0
0
G
_
R
M
X
_
R
P
S
X
/
_
C
R
S
D
C
D
P
X
_
R
S
C
P
/
M
X
_
R
S
C
P
_
T
8
A
V
3
B
V
_
I
A
1
P
_
B
G
B
M
P
C
M
A
G
S
8
-
1
U
T
B
0
B
0
S
N
1
M
A
P
1
G
S
-
5
3
0
1
-
T
_
8
3
V
A
B
V
A
8
_
P
B
1
0
5
W
S
I
H
C
T
-
L
1
2
1
0
D
T
_
IN
M
A
R
V
P
M
S
F
R
1 2
M
S
F
R
5
_
2
G
A
_
P
O
P
F
R
_
T
B
W
_
S
_
R
T
W
I
I_
F
W
_
S
R
_
T
B
a
l
B
u
F
R
I_
W
IF
4
5
0
2
1
5
2
G
M
D
L
T
3
7
7
0
1
0
0
U
I
E
C
V
N
A
R
2
9
e
r
A
o
4
2
0
M
F
S
R
N
_
E
A
8
_
P
N
_
E
A
/ B
1
_
P
B
P
M
A
_
R
3
G
_
B
G
3
S
S
A
_
P
Y
8
8
R
S
C
X
/T
X
R
T
n
0
1
2
C
H
U
X
R
N
1
0
0
0
C
S
O
-
F
A
2
H
0
(
4
0
M
z
)
H
C
S
O
6
8
K
3
2
.7
E
)
s
t
e
le
L
B
8
V
_
T
3
A
_
B
V
_
D
F
_
3
8
_
_
2
D
R
V
V
3
G
_
I
_
F
D
_
D
8
1
_
R
V
D
G
V
3
G
_
_
F
4
_
D
1
5
_
R
D
V
V
3
G
_
F
1
_
2
8
_
R
V
2
G
_
D
D
V
_
_
F
2
_
D
2
8
_
R
D
V
V
2
G
I
_
F
D
_
1
8
V
G
_
R
D
D
V
_
3
_
G
N
T
S
R
L
K
_
F
C
E
_
R
3
G
R
E
BT_CLK
1
0
3
U
T
B
-
A
4
1
-
0
R
0
A
I
J
S
C
COEX_2
COEX_1
1
1
0
W
I
I
F
1
1
-
B
P
S
6
0
T
0
C
1
0
2
U
M
F
1
2
0
R
A
O
O
I
P
3
.
5
K
C
J
A
R
A
L
C
I_
P
_
F
S
_
R
3
G
I
/
P
_
S
F
N
_
R
E
_
3
G
I
P
T
F
_
S
_
A
R
_
D
3
G
P
/
_
I_
X
_
R
_
I
X
3
G
_
R
_
3
N
G
_
_
_
G
N
_
/
Q
X
P
R
_
Q
3
X
_
R
3
G
_
I
_
X
T
_
I
G
_
N
_
X
T
/
3
3
G
P
_
_
N
_
Q
_
X
T
G
/
3
P
_
_
Q
_
X
T
3
G
P
_
I_
X
_
T
X
N
/
R
_
I_
X
T
_
X
R
P
_
Q
_
X
T
_
X
R
/
N
_
_
Q
_
X
T
X
R
K
L
_
C
Q
E
_
R
T
B
D
_
W
_
I
8
_
O
L
1
V
D
O
V
T
B
_
T
S
R
_
T
I
T
B
N
C
T
U
_
O
M
P
_
IN
M
C
P
Y
_
S
M
C
/
P
K
L
_
C
M
C
P
I
T
IG
_
Z
D
H
3
2
K
T
_
B
P
U
_
E
W
K
A
_
2
S
T
_
2
/R
D
X
T
_
2
S
T
_
2
/C
D
X
R
COEX_0
W
_
I
8
O
D
_
_
1
L
V
D
O
V
3
_
W
D
3
I
V
D
V
I_
F
8
_
V
3
T
A
_
B
V
_
I
T
W
A
_
O
D
I
S
I_
F
_
I
T
A
D
_
N
S
I_
W
IF
C
W
C
A
I
I_
F
N
W
_
S
C
I
I_
F
W
I
I
F
K
L
_
C
S
_
I
W
T
n
S
IF
_
R
IT
IG
_
D
Z
H
3
2
K
W
_
N
I
E
I
F
D
0
_
V
3
_
M
F
D
V
W
8
_
_
O
L
1
V
_
IO
D
D
V
/
A
D
S
_
M
F
M
F
L
C
_
S
IT
IG
_
D
Z
H
3
2
K
Q
_
IR
M
F
_
T
L
U
O
A
_
F
M
0
_
T
R
U
O
_
A
M
F
_
I
C
S
N
T
U
_
O
C
S
R
I
_
A
B
_
E
S
A
IC
M
T
I
3
P
C
E
T
E
_
D
_
P
I
P
IC
5
_
/
M
3
C
D
_
A
I5
P
3
R
A
_
L
E
K
P
S
_
/
R
I
K
D
C
O
K
C
N
A
2
0
0
P
C
U
6
8
0
9
A
T
A
D
/
3
1
A
1
1
U
G
M
A
R
Y
R
O
M
E
_
D
D
V
I
W
_
L
O
8
_
1
D
V
I
D
(
S
D
:
0
_
A
1
3
)
I
D
:
S
(0
1
5
)
_
Q
D
D
S
1
A
_
B
_
D
0
/
_
A
_
B
D
_
0
M
1
/
Q
_
D
M
D
Q
_
D
D
1
S
0
/
S
Q
Q
_
D
_
D
D
D
_
N
L
K
_
C
D
_
N
E
_
W
D
E
_
C
R
D
D
E
K
_
C
D
_
N
S
A
_
C
D
B
T
_
B
S
R
Y
D
R
I_
F
_
N
P
M
S
I
F
N
_
W
/
_
N
E
F
I
_
N
N
E
_
R
F
I
/
N
_
N
E
_
C
I
F
N
L
E
_
A
/
L
E
C
I_
F
N
I
F
N
(
0
:
_
D
1
5
)
_
0
3
V
D
_
S
D
D
V
(
A
T
A
0
:
_
D
D
S
)
3
D
/
K
M
L
_
_
C
C
D
D
S
S
T
E
_
D
D
S
I
_
S
_
0
3
D
V
D
M
V
I
S
_
I
M
O
K
L
T
S
_
I
C
/
_
S
R
M
IM
S
_
8
2
V
M
A
_
_
C
A
D
D
V
_
8
1
V
M
A
_
C
C
_
D
D
V
_
I
_
8
1
V
M
A
O
_
C
D
D
V
(
_
Y
A
T
0
:
A
D
7
)
I
_
K
L
_
C
P
N
T
U
_
O
K
L
_
C
M
C
N
Y
C
N
_
/
S
Y
_
V
S
H
L
A
D
_
/
S
C
_
S
M
A
M
A
C
C
M
M
A
A
_
_
T
C
C
S
N
/
E
R
_
3
D
_
L
C
D
D
V
W
_
L
O
_
_
IO
D
D
V
(
5
D
0
:1
L
_
C
D
C
L
S
/
C
L
_
W
D
C
L
R
/
D
_
L
M
F
C
L
D
L
C
_
G
V
D
L
C
S
_
R
D
C
L
L
_
B
D
_
C
L
N
E
D
C
L
8
_
T
3
V
A
_
B
V
T
O
M
I
_
V
D
3
_
3
V
D
B
V
_
_
N
P
V
V
C
C
/
R
R
C
R
A
D
S
_
P
S
T
L
C
_
S
P
S
T
P
S
_
N
K
P
_
P
K
P
/ S
S
L
(
O
0
_
:
C
Y
E
K
2
)
(
0
:
1
W
O
)
_
R
Y
E
K
8
_
T
3
V
A
_
B
V
P
_
B
S
M
_
/
B
U
S
U
_
I
B
S
U
D
I
_
2
B
.
S
A
1
5
V
I
_
M
C
I
I
A
_
_
P
M
C
N
M
I
I
A
_
_
N
M
N
C
M
O
_
C
D
S
I
S
M
C
0
V
8
1
V
(
_
D
0
D
L
C
I
M
_
E
D
C
L
)
N
O
_
S
_
C
C
D
C
L
N
_
S
O
_
C
R
D
C
/ L
I
F
R
E
T
L
D
S
_
R
_
W
D
C
L
R
D
_
R H T
_
D
E
L
_
I
L
_
B
C
_
D
E
L
V
T
K
D
A
P
Y
E
K
B
S
U
I
M
C
M
+
D
(
N
A
2
G
N
D
1
G
2
G
M
)
A
R
1
D
G
D
M
A
R
D
D
N
A
N
N
N
O
_
C
M
A
A
R
E
:
1
N
5
)
O
_
C
N
O
_
C
N
_
2
P
6
V
P
S
D
C
L
M
I
A
N
)
D
N
T
C
L
(
2
.
8
'
8-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
PCB Diagrams
8-2.
8-2-1.
Top
8-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
8-2-1.
Bottom
8-3
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
LOGIC
8-3.
8-3-1.
Power On
Power switch on
NG
Check the current
consumption
>= 100
mA?
Yes
Check the battery
voltage
>= 3.8?
Yes
Check the clock at
OSC200
=32
KHz?
Yes
L200(VDD_GSM_CORE_1V2)=
L201(VDD_IO_LOW_1V8)=1.8
1.2
V?
V?
NO
NO
NO
NO
Download
Change the battery
Resolder OSC200
Check the UCP200
Yes
Check the clock
DCX100
=26
Mhz
?
Yes
Check the initial operation
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
NO
Check the clock generation circuit
8-4
O
Level3Repair
C
4
3
2
S
O
S
C
I
_
C
N
1
_
U
O
T
4
C
3
2
5
O
S
C
0
2
0
2
3
8-5
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
8-3-2.
TSP Working
Power Switch On
LCD Display
On?
Yes
NO
LCD FPCB
connector is co
rrectly connecti
ned?
Yes
F300,F301
F302
Correctly mou
nted?
NO
NO
correctly connect
F300,F301,F302
Resolder
Yes
LCD
Replace
Yes
C321
LED_P_26V=26V?
NO
Replace U300&Check
neighboring circuits
8-6
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
N
N
N
N
O
O
O
O
O
O
O
O
0
0
3
F
1
I
N
_
C
S
L
C
D
R
D
L
C
D
_
D
_
R
S
L
C
R
W
L
C
D
_
L
D
3
)
(
2
)
(
L
D
)
L
D
1
(
D
0
)
(
L
7
)
L
D
(
L
D
6
)
(
5
)
(
L
D
)
L
D
4
(
1
2
2
I
N
3
I
N
3
4
I
N
4
D
G
N
1
0
3
0
F
1
N
1
I
2
I
N
2
3
I
N
3
4
4
I
N
G
N
D
1
0
3
0
F
1
I
N
1
2
N
2
I
3
I
N
3
4
I
N
4
G
N
D
1
0
5
1
T
O
U
6
2
T
O
U
7
U
3
T
O
8
U
4
T
O
D
G
N
9
1
5
1
T
O
U
6
O
U
2
T
7
U
3
T
O
8
4
T
O
U
G
N
D
9
2
5
O
U
1
T
6
2
T
O
U
7
O
U
3
T
8
U
4
T
O
D
G
N
9
_
C
S
L
L
L
L
L
L
L
L
L
L
L
L
O
C
D
_
C
_
C
O
D
_
R
D
C
O
_
R
_
C
S
C
D
R
_
C
O
C
D
_
W
_
C
)
D
_
D
3
(
C
C
_
D
_
2
)
(
C
D
_
C
1
)
(
C
D
_
D
_
C
)
D
_
D
0
(
C
C
_
D
_
7
)
(
C
D
_
C
6
)
(
C
D
_
D
_
C
)
D
_
D
5
(
C
C
_
D
_
4
)
(
C
D
s
r
i
l
t
e
F
M
I
E
C
D
L
"
.
8
2
8-7
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
8
_
3
T
V
A
B
V
3
4
1
C
L
_
B
D
_
L
C
N
E
3
R
3
5
8
L
3
0
0
D
L
3
5
9
3
2
6
R
3
0
0
U
3
D
P
V
1
A
2
A
3
C
3
A
3
B
4
2
3
C
0
0
3
4
3
C
O
L
X
I
N
P
M
O
C
T
E
|S
N
E
M
W
P
2
D
T
E
S
R
1
D
S
C
1
B
D
N
G
P
1
C
D
N
G
1
C
N
2
C
N
_
D
L
E
3
2
4
R
R
N
3
4
4
C
3
2
5
_
2
6
_
V
P
D
E
L
L
C
D
B
L
C
I
8-8
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
8-3-3.
Audio Working
Speaker Working
Operate speaker
NG
Check
Speaker
Contact
YES
Speaker break
down?
NO
NO
ReContact
YES
Change Speaker
Change main PBA
8-9
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Level3Repair
0
4
3
D
3
0
0
K
P
S
1
1
3
1
3
_
P
K
P
S
N
_
K
P
S
R
3
1
5
R
1
0
0
5
1
0
0
5
2
2
0
1
3
K
P
S
1
1
2
2
3
0
7
D
R
E
K
A
E
P
S
8-10
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Receiver Working
Level3Repair
Operate Receiver
NG
Check
Receiver
Soldering
YES
Receiver break
down?
NO
Check
L302,L303
Operate?
NO
NO
Resolder
YES
Change Receiver
YES
Soldering or
Replace L302,L303
Change main PBA
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
8-11
Level3Repair
3
0
5
D
3
1
2
C
L
3
0
L
C
3
2
0
3
E
I
V
E
R
2
2
1
1
0
0
3
V
C
R
6
3
0
D
_
P
V
C
R
N
_
V
C
R
3
1
3
C
E
R
8-12
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
MainMICWorking
Operate MIC
NG
Level3Repair
Pollute
MIC Hole?
NO
MIC FPCB
Soldering?
YES
Check
C237=High?
YES
NO
NO
Clean up MIC hole
MIC FPCB
Resoldering
NO
Check
MIC_BIAS_2.15V
=2.15V?
YES
Change MIC
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
8-13
Change MIC
Change main PBA
Level3Repair
M
A
I
M
N
I
P
P
C
O
O
G
G
3
0
W
E
W
E N
G
D
N
N
G
D
N
U
U
O
O
M
I
I
_
B
C
S
M
A
0
1
R
R
2
D 1
3
D 2
4
T
T
I
C
L
3
0
1
I
A
M
_
N
I
_
M
C
N
I
_
P
M
C
I
A
_
N
M
3
0
4
C
8-14
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Stereo Headset Working
Hands-free stereo
headset
NG
NO
Level3Repair
YES
Check R311Button NG?
MIC NG?
NO
SPK NG?
NO
The End
YES
YES
Check
L300
YES
Resolder L300
Signal on
in C259,
C261?
NO
Change Main PBA
NO
Check C309
YES
Change SPK Module
8-15
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Loading...
+ 35 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use