Samsung SGH-L870 Troubleshooting
Baseband
9-1.
9-1-1.
Power ON
Power On do es not work
Yes
Chec k the cu rrent
consumption more than
80mA
Yes
Chec k the Vbat volt age
more than 3.45 V
Yes
INIT_PWR
Low to High
No
Download again
No
Change t he Battery
No
Check the Initial
opreation
Yes
VCOREAP_1.2V = 1.2 V
VFMEM_1. 8V = 1. 8V
VPLLAP_1. 8V = 1.8 V
Yes
CLK32 K_PM = 3 2K sq u ar ed w av e
MAXTALI = 19.2 M
Check the Initial
opreation
9-1
No
No
Prob lem # 1
check the U403
Prob lem # 2
check the OSC401
and OSC801
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Flow Chart of Troubleshooting and Circuit Diagrams
Power On Problem
CLK32K_PM
VCOREAP_1.2V
C440
VBAT
VFMEM_1.8V VBAT
C429
VBAT
C442
VFUSE_2.5V
#1
AP_PM_SDA
AP_USB_IT
CLK32K_BT_RADIO
C432
VPLLAP_1.8V
C435
VAUX_2.8V
L402
L404
VBAT
K6
GPO2
H7
SDA
D2
MASTER_CLK
H8
USBINTN
A1
CLK32K_IN
K3
CLK32K
A4
VBAT_VIO_VMEM1
B4
VBAT_VIO_VMEM2
A2
B3
A3
VLX_VIO_VMEM1
C4
VLX_VIO_VMEM2
A5
VIO_VMEM_FB
D9
VBAT_VCORE1
D10
VBAT_VCORE2
B10
VMINUS_VCORE1
C9
VMINUS_VCORE2
C10
VLX_VCORE1
D8
VLX_VCORE2
A10
VCORE_FB
C7
VBAT_VPLL_ANA
A7
VANA
A8
VPLL
A6
VAUX
B6
VBAT_VAUX
C444
C
4
0
5
C445
C
4
0
6
1
3
4
C
C432
L402
R
4
8
2
2
8
3
R
C
4
2
9
R
2
4
4
4
1
C
4
C450
1
1
8
C
6
4
4
C
C
4
5
1
0
1
4
R
U403
9-2
C430
C812
C
4
4
4
U
8
0
1
C446
n
R
T
T
_
S
P
A
T
9
C440
L
4
0
4
9
0
4
C
4
1
2
0
8
U
C
C
4
3
5
D
8
0
1
C
C
4
4
1
4
0
5
7
6
1
1
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Flow Chart of Troubleshooting and Circuit Diagrams
Power On Problem
VFMEM_1.8V
R415
C443
#2
CLK32K_OSC_OUT
OSC401
1
VIO
C
N
2 3
VFMEM_1.8V
U401
1
NC
2
A
3
GND
12
VCC
7
OUT
C
C
C
C
N
5 8
N
N
910
C
C
G
N
N
11
6
C
N
N
4
VCC
NC
6
5
4
Y
CLK32K_PM
R418
CLK32K_OSC_OUT
0
4
3
R
4
2
7
R
1
4
0
C
R
1
4
1
0
0
R
R
8
1
3
1
2
4
1
C
4
1
8
R
8
3
1
R433
U
S
R314
S
3
7
O
R
4
1
5
2
0
3
2
O
U409
4
R
6
3
4
R
4
4
3
C
C
4
3
4
1
C
4
R
4
3
8
R
C
4
0
7
D402
3
8
3
9
R
4
0
4
L
4
C
4
0
3
4
C
3
3
R425
8
R
R423
4
3
1
R
4
5
1
C
R426
4
2
8
R
R413
1
2
4
R
T
R
4
0
1
C452
U406
4
3
8
R
T
P
3
1
0
9-3
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Flow Chart of Troubleshooting and Circuit Diagrams
9-1-2.
System Initial
CLK 32 K_PM = 32 K squ are d wave
Initial Failure
Yes
Chec k the INIT _PWR
Low to High
Yes
VCOREAP_1. 2V = 1 .2 V
VFMEM_1.8V = 1.8V
VPLL AP_1 . 8 V = 1 . 8 V
Yes
MAXTALI = 19. 2M
Yes
Chec k the CP_ON_EN
High to Low
No
Init P roblem # 1
No
Power On Prob lem # 1
No
Power On Prob lem # 2
No
Init P roblem # 2
Yes
VSD2_1 . 8V = 1.8V, VSD1_1. 35 V = 1.35 V
VPLL_1.3 5V = 1. 35 V, VIO_2.62 V = 2 . 62 V
Yes
OSC 301 = 32 KHz
CLK26 M_RF = 26 MH z
Yes
LCd di sp la y is OK ?
Yes
So un d i s OK ?
Yes
No
Init Problem # 3
No
Init Problem # 4
No
Chec k the LCD Par t
No
Check the Audio Part
END
9-4
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Flow Chart of Troubleshooting and Circuit Diagrams
INIT Problem
VBAT
S2
G1
D3
C451
TR401
R438
#1
VBAT
VBAT
C452
5
1
4
2
U410
3
1
0
4
V
INIT_PWR
U408
OUT
VDD
1
2
C455
4
GND
3
NC
C
4
3
4
1
2
0
C
4
3
2
R
U409
U
4
0
8
1
C437
C433
D403
R
3
C
7
1
V
4
0
D
0
CAM_KE
3
6
4
C
3
0
7
1
1
8
U
C
C830
8
4
8
R
R847
R
3
D402
4
3
8
C
3
9
4
C
3
4
3
3
8
8
R
R
1
1
R426
8
R413
3
L
4
0
3
T
R
C452
1
2
4
R
U406
R425
R423
4
3
R
4
5
C
4
3
8
R
U410
L
4
0
1
V401
4
4
2
R
R
0
1
T
P
3
1
0
C
1
0
R
4
2
4
R
9
4
2
2
8
2
C
4
5
9-5
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Flow Chart of Troubleshooting and Circuit Diagrams
INIT Problem
#2
1
Q401
DTC144EM
2
0
7
C
D
H
VBAT
R412
WDOG
3
2
RTC_OUT
CP_PM_INTCP_ON_EN
PM_RSTn
PM_VCXO_EN
3G_VDDCORE_HI
CP_PMU_RST
CP_RST
CP_BP_SCL
CP_BP_SDA
3
1
4
0
4
C
7
V
2
1
7
V
4
8
2
C
6
4
0
1
R
5
1
8
C
Q401
7
R
C520
U
5
1
0
1
5
R
1
0
1
5
0
5
R
3
2
8
8
1
0
4
8
R
R
9
5
0
3
8
8
R
R
R829
4
U
R
8
4
0
9-6
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Flow Chart of Troubleshooting and Circuit Diagrams
INIT Problem
#3
VPLL_1.35V
VAUX_2.9V
VSD2_1.8V
VIO_2.62V
R409
C416
C417
C419
C415 C427
C414
L401
VAUDIOB_2.5V
VAUDIOA_2.5V
C422 C423C418
C421
VSD1_1.35V
VEDGE_1.5V
C424
VRF_2.9V
C425
VSIM_2.9V
C426C420
C436
C433
C437
D401
C434
C438
R408
C
4
5
4
6
3
4
R
4
4
3
4
1
5
C
R419
2
4
2
C
4
2
3
C
R
4
C
0
4
4
0
7
C
D402
4
3
8
C
4
3
9
C
3
4
3
3
R425
8
8
R
R
R423
C439
4
0
1
2
0
4
C
C
C
C
4
1
6
7
0
4
R
8
4
1
4
1
R
4
4
0
C
9
C424
4
1
9
C
C420
6
2
4
C
C421
U402
L
4
0
3
L
4
0
1
C428
R406
R405
1
0
C425
8
4
D
C
4
1
4
4
0
C
2
0
6
C
S
C
4
2
7
4
0
3
R
1
0
7
V
C437
C452
1
2
4
R
U406
V401
C433
6
4
3
C
CAM_KE
9-7
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Flow Chart of Troubleshooting and Circuit Diagrams
C103 C105
C104
NC
6
NC
T
U
O
4
3
C
C
V
T
N
O
C
V
1
TCS101
D
N
G
2
NC
5
NC
7
8
C106
R101
VTCXO_2.8V
CLK26M_RF
INIT Problem
#4
CLK26M_CP
CLK32K_CP
CLK26M_AFC
R316
C320
CM315
OSC301
C322
CLK32K_OSC_OUT
C310
R319
C323
C317
1
7
R
3
1
C320
6
0
1
1
S
C
1
3
R
0
3
6
0
3
C
1
8
3
R
S
O
3
0
1
H
T
3
2
2
3
0
3
R
C
2
0
3
P
T
9-8
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R208
S
8
1
2
C
C
C
1
0
3
T
2
0
1
R
4
0
1
C
C
1
0
5
C
1
1
0
0
1
6
R
Flow Chart of Troubleshooting and Circuit Diagrams
9-1-3.
Sim Part
“ Insert SIM” is displayed on the LCD
Yes
Check the c ontac t of
CN701 aft er removing SIM CARD.
Is there any damage?
No
Is there any Signals
pin# 13, # 14, # 15, # 16
of CN701?
Yes
Check the SIM Card
Yes
END
Yes
No
SIM Pr o ble m # 1
Replace th e CN701
SIM Prob lem # 2
check the related SIM
signals
SIM Problem
#1
U
8
0
2
2
2
7
R
C
7
0
4
R
7
2
1
9
1
7
R
0
2
7
R
8
1
7
R
5
7
0
1
7
7
8
6
0
7
C
R
C
0
7
C
1
0
7
N
C
C707
9-9
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Flow Chart of Troubleshooting and Circuit Diagrams
SIM Problem
#2
CN701
SW-B
SW-A
C1
C5
C2
C6
C3
C7
NC
NC
NC
NC
NC
NC
NC
VSIM_2.9V
R717
1
2
3
1
4
2
5
3
6
4
7
5
8
6
9
7
10
8
11
12
13
14
15
16
17
18
19
20
21
22
23
C706
C707
C708
C705
SIM_RST
SIM_CLK
SIM_IO
8
1
3
C
4
1
1
C
8
1
8
R
R
8
1
7
R
7
2
3
U
8
0
2
2
2
7
R
C
7
0
4
R
7
2
1
9
1
7
R
0
2
7
R
8
1
7
R
R410
5
7
0
1
7
7
8
6
C
R
0
0
7
7
C
C
1
0
7
N
C
C707
RFS101
9-10
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Flow Chart of Troubleshooting and Circuit Diagrams
9-1-4.
Charging Part
Abnormal Charging Part
The pin # 19, # 20 of the
IFC501 is VEXT_5V = 5V?
The pin # 6, # 4, # 5 of the
Yes
Yes
U407 is low ?
Yes
No
Charging Problem # 1
Replace TA or Check IFC601
No
Charging Problem # 2
Check the U407
Charging Problem
#1
END
I
F
C
6
0
1
T
P
8
0
4
5
6
0
0
8
8
U
U
0
2
6
D
6
0
1
D
6
1
6
R
C
6
0
6
1
5
6
R
6
1
4
R
6
1
3
R
6
1
2
R
6
1
1
R
6
0
8
R
6
0
7
R
6
1
7
R
1
0
6
D
Z
9-11
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Flow Chart of Troubleshooting and Circuit Diagrams
Charging Problem
VFMEM_1.8V
R429
TA_nDET
CHG_ING_N
#2
R430
C453
R434
R435
1
USBIN
2
IUSB
ITERM
4
PWR
5
CHRG
U407
BATDET
GND
11
10
DCIN
9
BAT
83
IDC
7
6
EN
LTC4078X
R436
VEXT_5.0VVBUS_5.0V
VBUS_5.0VVBAT
R427
BP_CF
R433
R437C454
TA_OFF
C453
R434
R435
2
9
0
5
8
3
0
R
U
4
2
2
4
C
0
7
3
4
2
C
4
R
4
R
2
7
4
R
R433
3
7
4
R
6
9-12
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Flow Chart of Troubleshooting and Circuit Diagrams
9-1-5.
Microphone Part
Microphone does not work
Check the soldering status
of micr ophone.
Check the Mic bias voltage
VMIC_BIAS_3.0V = 3V
Yes
Yes
Yes
No
No
Microphone Problem # 1
Replace or retouch t he Mic
pad
Microphone Problem # 2
Resolder or replace
R603, C 604
Is micr op hone ok ?
Microphone Problem
#1
END
Yes
No
Microphone Problem # 2
U301, U502
I
C
M
MIC+
2
1
0
0
6
6
V
V
9-13
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