Samsung SGH-X120, Service Manual

Page: 15 / 28

SAM SU N G Proprietary-C ontents m ay change w ithout notice
SGH-X120 Flow Chart of Troubleshooting and Circuit Diagrams
2- 12
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D EB U G _R TS
I/F C O N N EC TO R
B P_C F
G N D
VC C D
VO LU M E
G N D
D EB U G _TXD
VEXT
SD S_R XD
D EB U G _D SR
G N D
D EB U G _C TS
SD S_TXD
VEXT
G N D
VTEST
JTA G C O N
D LC _D ETEC T
D EB U G _R I
D EB U G _D C D
JIG _O N
PO W ER
K EY
D EB U G _R XD
IR D A
G N D
B P_VF
VB A T T
12
D EB U G _D TR
C 315
K EYPA D
PW R
VC C D
G N D 2
1
IN +
IN -
2
0
R
3
2
1
K EYPA D
12
C N 302
3
G N D 1
4
R 312
1K
6
R 311 1K
LED 307
R 339
C 320
LED 312
R 348
R 316
R 301
12
R 349
C P_TM S
8
K EYPA D
ZD 303
1
2
3 4
5
6
Z
D
3
1
6
R 300
1K R 304
4
PR O G VC C
3
VSEN SE
5
U 301
6
D R IVE
2 G N D
ISEN SE
1
C 330
1U F
C 329
1K
C 318
VO SC
R 313
R 303
VB A T
R 327
0
3
1 2
D SP_TD I
C 306
ZD 306
R 325
Q 302
1
3
2
0
12
12
VC C D
SEN D
K EYPA D
SW 2
34 5
K EYPA D
3
12
K EYPA D
*
12
D SP_TM S
R 344
C 305
Z
D
3
1
3
Z
D
3
1
8
K EYPA D
SH A R P
12
R 323
C 303
R 309
2
R 347
R 315 1K
K EYPA D
LEFT
1
Z
D
3
1
4
1K R 306
VB A T
R ST
C 327
C 328
R 305 1K
C 316
LED 302 LED 309 LED 301 LED 310
C P_TD O
Z
D
3
1
2
12
Z
D
3
1
5
V_AU X
K EYPA D
M EN U
12
STO
K EYPA D
R 307 1K
12
R 337
K EYPA D
U P
R 341
D SP_TC K
K EYPA D
7
12
Z
D
3
2
0
C 321
R 334
C 307
1K R 314
SW 1
34 5
12
V_M O TO R
I
K EYPA D
12
R 354
1K
R 338
R 310
L
E
D
3
0
5
R 342
VC C _1.8A
VB A T
300
L
E
D
3
0
4
C 323 C 324
C P_TD I
Z
D
3
0
8
C 301
C 308
G
78
G G
91 0
G
R 346
C N 300
1
1
2
2
3
3
4
4
5
5
6
6
0
D D -D O M -4PIE-2
12
VB A T
VC C D
C 322
R 302
C 317
VPA C
C 300
C 325
VC C D
0
R 329
VC C D
VR TC
R 350
0
R 357 N C
1
2
3 4
5
6
R 356
ZD 301
4
RXD
SD
5
TXD
3
6
V C C
C 309
LED300
7
G ND
LEDA
1
2
LEDC
Z
D
3
1
1
1K R 317
N C
VB A T
C 312
R 355
K EYPA D
5
12
VB A T
Z
D
3
2
1
LED 303
R 340
30
R 320
VR F
LED 311
R 335
R 336
VLD O _3
VLD O _4
37
VLD O _5
33
42
VLD O _6
40
VLD O _7
V
R
E
F
30
VR TC
12
V
S
IM
48
VEXT
V
IB
_
D
R
V
4
36
VL4S_A
VL4S_B
35
32
VL5S_A
VL5S_B
31
VLD O _1
9
VLD O _2
11
39
U P_R ST
54
VA C C
3
VB A T 2
10
VD D 12
VD D 34 38
VD D 5
34
VD D 67 41
1
R TC _A LM N
SC L K
17
SD I
15
SD O
16
S
IM
_
C
L
K
50 51
S
IM
_
IO
49
S
IM
_
R
S
T
53 UP_CLK
U P_IO
52
PSW 1_B U F
20
21 PW R_KEEP
PW R _SW 1N
46
47
PW R _SW 2
R ESET N
19
5
R
IN
G
_
D
R
V
R IN G _PW M
55
13
G
N
D
6
5
6
6
G
N
D
60
G N D D
G
N
D
D
1
6 28
G
N
D
Q
14
IN TR Q
7
L
E
D
1
_
D
R
V
L
E
D
2
_
D
R
V
8
G
N
D
6
7
6
8
G
N
D
58
G N D
G N D
59
6
1
G
N
D
G
N
D
6
2
6
3
G
N
D
G
N
D
6
4
C
R
E
F
18
C SN
22
EN _3
EN _4[0]
23
24
EN _4[1]
EN _5
25
26
EN _5A
EN _5B
27
G N D
57
U 300
A D C _A U X1
44
45 ADC_AUX2
56 ADC_TRIG
B TEM P
43
29
Z
D
3
0
7
K EYPA D
R IG H T
12
4
K EYPA D
12
R 345
K EYPA D
1
12
2
K EYPA D
12
C 326
VC C B
M 1
N
E
G
2
P
O
S
1
R 318
C 314
Z
D
3
0
9
Z
D
3
1
7
R 319
V_AU X
ZD 322
Q 300
1
3
2
C 302
0
R 326
3
1
2
5
6
4
Q 301
C 313
R 322
C 310
C P_TC K
VC C A
7
7
8
8
9
9
N C
23
N C
24
D SP_TD O
2
2
20
20
21
21
22
22
3
3
4
4
5
5
6
6
12
12
13
13
14 14
15
15
16
16
17
17
18
18
19
19
1
4
C N 301
1
1
10
10
11
11
Q 303
2
5
6
3
R 343
R 333
300
5 N /C
N /C 8
7
N /C
1 VIN V O U T1 10
9 VO U T2
0
3 EN 2
G N D 6
11
G
N
D
G
N
D
12 13
G
N
D
G
N
D
14 15
G
N
D
G
N
D
16
U 302
C B YP
4
EN 1 2
C 304
ZD 302
1
2
3 4
5
6
ZD 319
1
2
3 4
5
6
VR T C
Z
D
3
1
0
VC C D
LED 308 LED 306
C 311
100N F
VC C B
12
C 319
1K
D O W N
K EYPA D
2
C LEA R
D D -D O M -4PIE-2
12
R 308
R 324
K EYPA D
9
1
TA _VEXT
D A ID I
B P_VF
TA _VEXT
D A IC K
D A IR N
D A ID O
D EB U G _R XD
D EB U G _TXD
IR D A _EN 1
D EB U G _R T S
JIG _O N
B P_C F
D EB U G _D C D
D EB U G _D SR
D EB U G _R I
SD S_R XD
SD S_TXD
K EY_B A C K LIG H T_EN
V_A U X
V_M O TO R
IR D A _E N
IR D A _R X
IR D A _TX
D EB U G _C T S
D EB U G _D TR
D LC _D ETEC T
VIB _EN
C P_TD O
D SP_TC K
D SP_TD O
R ST
C P_TD I
D SP_TD I
C P_TM S
D SP_TM S
C P_TC K
C H G _O N
K EY_C O L(0:4)
K EY_C O L(4)
K EY_C O L(2)
K EY_C O L(1)
K EY_C O L(0)
K EY_R O W (0:4 )
K EY_R O W (4 )
K EY_R O W (3 )
K EY_R O W (2 )
K EY_R O W (1 )
K EY_R O W (0 )
PW R _O N
K EY_C O L(3)
U P_SC L K
U P_C S
IC H R G
TA _VEXT
VR EF
SIM D A T A
SIM R ST
SIM C LK
C H G _D ET
PW R _O N
JIG _O N
R TC A LA R M
EN _VR F
EN _VPA C
XO EN A
U P_SD I
K EY_R O W (0)
K EY_C O L(2)
TA _VEXT
PW R _K EEP
R ST