![background image](http://html.mh-extra.com/html/samsung/sgh-t509/sgh-t509_service-manual_1190201038.webp)
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
7-10
SI
M
_
VC
C
VD
D
_4V not
use
SI
M
_
IO
VDD_SLEEP
M
IC_
BI
AS
AVDD
AVDD_
HF
A
2.
9V
VDD_
IO
_
H
IG
H
VDD_
GSM
_
CORE
2.
9V
2.
6V
2.
9V
VDD_
VI
B
1.
9V
2.
7V
VCC_
RX_
T
X
VCC_SYN
2.
1V
2.
8V
DCDC-
1.
875V
2.
6V
B
T
_N
O
T
_U
SE
not
use
S
IM
_
CL
K
1.
8V
VDD_
IM
AGE
VD
D
_
VI
B
_2.
9 3.
3V
LD
O
VDD_
IO
_
L
OW
SI
M
_
R
S
T
LDO
DC/DC Down Conveter(1.8Volt)
C
408
C
422
C
423
C
426
TA
415
R
401
O
S
C
400
R
404
L400
C
400
C
414
T400
EN
3
FB
4
2
GND
SW
5
1
VI
N
U
402
C
420
C
418
TA
413
C
410
C
409
C
416
TA
404
R
406
C
421
C
419
R
403
C
417
C
403
C
412
11
_
S
IM
RS
CD
44
_SIMRSHC
7
R
402
31
VCHG
32
VINT
29
VSAVE
30
_IRQ
10
_ONKEY
27
_REC1
1
_R
E
C
2
13
_RSTHC
3
S
IM
CKCD
43
SIMCKHC
8
S
IM
D
3
V
BAT
40
SI
M
E
N
45
42
S
IM
IOCD
SIMIOHC
9
S
IM
V
CC
41
VBAT
5
REFC
28
RF
1
2
V
BAT
23
22
RF
1
V
DD
RF
2
V
DD
24
SCL
2
38
S
CN
SC
P
37
SDA
20
L
P
D1
V
BAT
L
P
V
DD
19
MICBIAS
12
NC
53
54
NC
26
OSCI
OSCO
25
PWREN1
6
PWREN2
GP
O1
48
GP
O2
47
GP
O3
46
18
HCV
BAT
HCV
DD
17
IO
D2
V
BAT
15
14
IO
V
DD
CPVDD
35
D1
V
DD
21
16
D2
V
DD
D3
V
DD
39
GND
49
50
GND
GND
51
52
GND
U
400
CHGCUR/BATMAX
34
CHGDRV
33
CLK32K
4
36
CPVBAT
C
405
C
424
TA
411
C
406
C
407
VR
400
R
407
L401
U
401
6
CE
GND
2
GND
5
4
NC
1
V
DD
VO
U
T
3
C
401
R
405
C
427
TA
425
1
C
402
B
A
T
400
NEG
2
POS
4
4
5
5
6
6
7
G
G
8
9
G
G
10
SI
M
400
1
1
22
3
3
+VD
D
_
IO
_LO
W
_1.
9V
+
V
BUS
USB_
IN
+VD
D
_G
SM
_C
O
R
E_1.
9V
32K
H
z
_D
IG
IT
+VD
D
_
IO
_H
IG
H
_2.
9V
ONKEYN
M
IC_
BI
AS
VDD_SLEEP_2.
9V
+
V
DD_
IM
AGE_
1
.8
V
+VD
D
_
R
X
_TX_2.
8V
+VC
C
_
SYN
_2.
8V
RST
O
N
SI
M
R
ST
BU_
RST
SI
M
C
LK
SI
M
IO
IT
_
P
MU
AUX_
O
N
REF
_
ON
PON_TX
SCL
SDA
+
A
VDD_
HF
A_
2
.6
V
+A
VD
D
_2.
6V
+VD
D
_
IO
_LO
W
_1.
9V
VBAT
VBAT
+VD
D
_
IO
_LO
W
_1.
9V
+
V
DD_
USB_
3
.3
V