Samsung SGH-U900 Troubleshooting
10. Flow Chart of Troubleshooting
10-1-1.
Power ON
Power On' does not work
'
Check the current consumption
Yes
Current consumption
Check the Vbat Voltage
Voltage
#3
Pin
mA
>= 100
Yes
>=3.3V
Yes
of D400 is high?
Yes
No
No
Download again
Charge the Battery
No
Check D400
Check the PMIC output
voltage
C419,C420,C422,C414,
(
C426,C415)
Yes
Check Pin#3 of TCX200
is
MHz?
19.2
Yes
Check the initial operation
END
No
No
Check U400
Check the clock generation circuit
relatedtoTCX200
(
)
10-1
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Flow Chart of Troubleshooting
10-2
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PMIC & CHARGER PART
VRF_2.7V
VRF_2.1V
Flow Chart of Troubleshooting
A7
MPP1|AMUX_IN1
B7
MPP2|AMUX_IN2
K3
AMUX_OUT
L3
MPP3|VIB_DRV_N
L1
MPP4|LCD_DRV_N
L2
KPD_DRV_N
D7
MPP5|RUIM_M_RST
H7
MPP6|RUIM_RST
D6
MPP9|RUIM_M_CLK
H6
MPP10|RUIM_CLK
D5
MPP11|RUIM_M_IO
H5
MPP12|RUIM_IO
K2
MPP7|CBLPWR_N
B4
MPP8|REF_OUT
D4
OPT_1
H8
OPT_2
C11
REF_BYP
E10
REF_GND
D10
REF_ISET
B5
SPKR_IN_M
B6
SPKR_IN_P
A5
SPKR_OUT_M
A6
SPKR_OUT_P
D8
TCXO_EN_1
E4
TCXO_EN_2
E11
TCXO_IN
H10
TCXO_OUT_1
B10
TCXO_OUT_2
F11
TCXO_OUT_RF
G4
USB_DAT
J1
USB_D_M
J2
USB_D_P
H2
USB_ID
F4
USB_OE_N
F2
USB_OVP_G
H4
USB_SE0
H1
USB_VBUS
VSIM_3.0V
C422
C423
C414
VMSM_1.2V
C424
VRF_2.1V
C426
C427
C425
VRF_2.7V
C428
C429
VTCXO_2.85V
C430
C415
C416
VRF_2.85V
R408
VSD_2.8V
C418
VEXT_5.0V
C433
R407
1
BAT400
2
R400
1
0
1
9
5
1
L
B
H
C
M
S
M
S
M
_
M
D
_
D
D
V
D
V
U400
6X6X1.2T
D
D
N
N
G
G
5
6
7
F
F
G
1
4
1
7
1
1
L
F
A
G
K
A
3
F
V
V
R
M
N
2
I
5
5
R
K
A
S
_
_
U
_
L
P
_
G
R
D
W
S
W
E
_
_
VREG_GP1
R
D
D
V
D
D
VREG_GP2
V
V
VREG_GP3
VREG_MMC
VREG_MSMA
VREG_MSME
VREG_MSMP
VREG_MSMC
VSW_MSMC
VREG_RFRX1
VREG_RFRX2
VREG_RFTX
VREG_RFUBM
VREG_RUIM
VREG_S2
VREG_S3
VREG_TCXO
VREG_USB
VREG_WLAN
XTAL_OUT
SBDT|SSBI
BAT_FET_N
CHG_CTL_N
HSET_BIAS
KPD_PWR_N
MSM_INT_N
PON_RESET_N
PS_HOLD
SLEEP_CLK
C
C
N
D
N
1
1
1
2
D
S
V
VSW_S2
VSW_S3
ISNS_M
ISNS_P
XTAL_IN
VCOIN
C
N
SBCK
SBST
VCHG
A3
A2
B1
L9
G11
K8
J11
K4
L400
K5
CIG21W4R7MNE
A9
A10
A8
B8
L10
L8
L6
K7
K6
A1
G2
B11
D1
D2
L11
K11
F8
G8
E8
J10
E2
C2
C1
K1
L4
C10
G10
F10
K9
R410
L401
L402
VBAT
VMSMB_2.6V
R403
R405
R427
TP401
PM_SBDT
PM_SBST
ON_SW
PM_INT
RST_N
RTC_CLK
3
OSC400
D400
1
2
C413
C432
2
1
C435
C417
PS_HOLD
PHONE_DEBUG_ON
C436
D
_
D
D
D
V
V
D
V
D
D
D
N
N
N
G
G
G
7
6
G
G
1
3
2
E
B
B
P
T
N
I
A
G
A
_
B
M
V
D
_
D
D
V
D
V
D
D
D
D
N
N
N
N
G
G
G
G
7
6
5
5
F
E
E
E
VMSMB_2.6V
VMSMA_2.6V VBT_2.6V
C419
VMSM_1.8V
C420
C421
10-3
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Flow Chart of Troubleshooting
10-1-2.
Charging Part
Initial Failure
L601,C437
5.0V @
U401 pin5=High?
Check the Battery&TA
Yes
Yes
Yes
Yes
?
No
No
No
if it has some problem, it is to be replaced.)
(
Check the IFC600
Replace U401
Check the U400
END
10-4
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Flow Chart of Troubleshooting
C607
VEXT_5.0V
R618
1
0
6
L
ZD601
T
C
0
0
1
S
5
0
0
1
Z
P
M
TA601
VBAT
RADIO_ANT
C608
21
ZD608
R620
L604
IFC600
1200-0020-05
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
TA_DET
CHG_ING_N
TA_EN
VMSMB_2.6V
VUSB_5.0V
R414
R423
R411
R422
R412
C438
VUSB_5.0VVMSM_1.8V
VEXT_5.0V
VBAT
U401
BAT
ICDL
USBON
IMIN
10
9
8
74
6
C439
1
CRDL
2
USB
3
_PPR11GND
_CHG
5
_EN
GND
C437
10-5
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ICHRG
R424
Flow Chart of Troubleshooting
10-1-3.
Sim Part
Insert SIM is displayed on the LCD
"
Yes
Check the SIM connector's
SIM
(
Check the voltage at pin#1
pin#2,#3,#4 of SIM
connection to
400)
SIM card
Yes
of SIM
400 >= 3.0V ?
Yes
Is there any signals
600 ?
No
No
No
Resolder or change SIM
Check the U400
Check the U400
400
Yes
Check the SIM Card
END
10-6
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Flow Chart of Troubleshooting
VSIM_3.0V
PM_SIM_RST
PM_SIM_CLK
C448
C449
C450
R421
SIM400
11
22
33 4
7
7
88
99
2
0
4
R
V
6
6
5
5
4
1212
11 11
1010
G
G
1314GG1516
PM_SIM_IO
C440
10-7
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Flow Chart of Troubleshooting
10-1-4.
Microphone Part
Microphone does not work
Is the assembled status of
microphone O.K?
Check the reference voltage on mic path
2.85V @
Is microphone ok?
END
Yes
Yes
Yes
R504
Yes
Yes
No
Replace the Front Assy'
?
No
No
Check the path
around MIC bias circuit
Check UCP300
10-8
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Flow Chart of Troubleshooting
MIC_OUT_P
MIC_OUT_N
C504
C514
C521
C510
C516
C501
V_MIC
R504
R518
C505
C515
C522
R512
R517
MIC_P
MIC_N
10-9
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