GT-M2520L-TSHOO_6.pdf

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9 . Flow Chart of Troubleshooting
9-1-1. Power ON
'Power On' does not work
Check the current consumption
Yes
Current consumption
>= 100 mA
No
Download again
Yes
Check the Vbat Voltage
Voltage >=3.3V
No
Charge the Battery
Yes
Check the pin of UCD300
Pin#A6 :1.8V
Pin#D6 :2.9V
No
Check UCD300 and C343,C344
Yes
Pin#M7 =2.9V
Pin#L8 =1.8V
No
Check UCD300 and C301,C303
Yes
Yes
Check the clock signal at pin#12 of RFT100
Freq =26MHz
Vrms >=300mV
Vpp ≒ 1000mV
No
Check the clock generation circuit
(relatedtoOSC100,Pin9,Pin10,)
Yes
Check the initial operation
END
9-1
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Flow Chart of Troubleshooting
C111
C110
C103
C302
C329
C303
C100
C326
C336
R100
C342
C109
C340
C115
C116
C341
C339
C108
C304
L115
L110
C337
C118
C117
C335
C331
C344
C306
L301
C305
TH300
C319
C332
R302
R300
VCCD_2.9V
VCCA_2.8V
VCCD_1.8V
C301
C302
C303
C300
AX113E
DCDC_OUT
C304
VRF_2.9V
EAR_ADC
TH300
VSYN_2.8V
VRF_2.9V
A4
B6
SIM_CLK
SIM_IO
SIM_RST
B3
B4
E6
B5
R301
A2
ICHRG
B1
N5
SIM1_CLK
SIM1_DATA
SIM1_RST
R300
C1
L6
C2
M6
R302
C305
D1
C306
D2
E3
F3
M2
M3
F2
L2
L3
N9
P1
CNTL_DAT_CSP
CNTL_EN_CSP
C308
C309
C310
R13
HI_MONO_OUT_N
HI_MONO_OUT_P
R14
D10
VBAT
LO_MONO_OUT_N
LO_MONO_OUT_P
R12
G5
P11
N7
AINT
DINT
C315
B11
MAIN_MIC_IN_N
EAR_MIC_IN_N
G13
F1
MAIN_MIC_IN_P
EAR_MIC_IN_P
J13
L9
G12
B12
L301
G11
B13
DCDC_OUT
N15
D3
L13
L10
C319
PSW1_BUF
R3
RTC_CLK
RADIO_L
RADIO_R
K14
K15
P3
SCUSTB
GND_SW
C9
H11
A12
R307
J12
F5
STEREO_OUT_L
STEREO_OUT_R
M14
C5
VSIM_2.9V
POS
1
M13
N4
UCD300
K7
BAT300
P6
E8
E9
PWR_KEEP
JIG_ON
PWR_ON
C320
E5
MOTOR_EN
C4
L7
VIB_RNG_EN
C321
NEG
2
F14
N6
CLK26M_ABB
R6
CLK_EN_ABB
J5
J6
H6
R4
FLASH_RST
RST
P5
KEY_BL1
D7
D9
G3
G4
C323
C324
C325
K13
VAMICREF
N2
K10
RXTX_DATA
RXTX_EN
RTX_I_N
RTX_I_P
RTX_Q_N
RTX_Q_P
R2
K12
C327
OSC300
C328
J3
J4
J11
C326
L14
K3
K4
F13
K11
C329
PAM_VRAMP
H5
M10
UP_CS
UP_SCLK
UP_SDI
UP_SDO
TXPSTB
L5
P10
R10
VBAT
VBAT
P12
P13
M9
VLDO_COREA_S
C10
B10
C6
A6
E11
E13
D6
E2
E14
A14
F12
D14
1
2
C15
C332
C333
C335
C336
C331
B15
C12
D13
GND_SW
GND_SW
VRF_2.9V
R100
C101
VRF_1.5V
GSM_PAM_IN
DPCS_PAM_IN
C103
C100
C102
VRF_2.9V
1
24
25
26
C108
C109
RTX_I_P
2
RTX_I_N
GSM850_LNA_IN_N
3
RTX_Q_P
RTX_Q_N
GSM850_LNA_IN_P
C110
4
5
6
RFT100
20
21
22
23
GSM900_LNA_IN_P
GSM900_LNA_IN_N
7
8
9
26MHZ_BT
DCS_LNA_IN_N
17
18
19
DCS_LNA_IN_P
PCS_LNA_IN_P
PCS_LNA_IN_N
10
VRF_1.5V
OSC100
C111
3
4
2
1
SBCK
SBDT
SBLE
CLK26M_DBB
C116
C115
9-2
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KEY_BL2
C7
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Flow Chart of Troubleshooting
9-1-2. Initial
Initial Failure
Yes
The pin #A6 of UCD300 =
1.8V and
the pin #D6 of UCD300 =
2.9V ?
No
Check the UCD300
(if it has some problem, it is to be replaced.)
Yes
Is the pin #P5 of UCD300
"Low → High" ?
No
Check the UCD300
(if it has some problem, it is to be replaced.)
Yes
There is 32.768kHz wave
forms at the C327 and C328
No
Check the UCD300
Yes
The voltage is "High" at the
C301,C302,C303
No
Check the UCD300
Yes
No
LCD display is O.K
Check the LCD part
Yes
No
Sound is O.K
Check the Audio part
Yes
END
9-3
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Flow Chart of Troubleshooting
C302
C329
C303
C326
C336
C342
C340
C341
C339
C304
C337
C335
C331
C344
C306
C319
L301
C332
C305
TH300
R302
R300
VCCD_2.9V
VCCA_2.8V
VCCD_1.8V
C300
C301
C302
C303
AX113E
DCDC_OUT
C304
VRF_2.9V
TH300
EAR_ADC
VSYN_2.8V
VRF_2.9V
A4
B6
SIM_CLK
SIM_IO
SIM_RST
B3
B4
E6
B5
R301
A2
ICHRG
R300
B1
N5
SIM1_CLK
SIM1_DATA
SIM1_RST
C1
L6
C305
C2
M6
R302
D1
C306
D2
E3
F3
M2
M3
F2
L2
L3
N9
P1
CNTL_DAT_CSP
CNTL_EN_CSP
C308
C309
C310
HI_MONO_OUT_N
HI_MONO_OUT_P
R13
R14
D10
VBAT
R12
G5
LO_MONO_OUT_N
LO_MONO_OUT_P
P11
N7
AINT
DINT
C315
B11
MAIN_MIC_IN_N
EAR_MIC_IN_N
G13
F1
MAIN_MIC_IN_P
EAR_MIC_IN_P
J13
L9
G12
B12
L301
G11
B13
DCDC_OUT
N15
D3
C319
L13
L10
PSW1_BUF
R3
RTC_CLK
K14
K15
P3
RADIO_L
RADIO_R
SCUSTB
GND_SW
C9
R307
H11
A12
J12
F5
STEREO_OUT_L
STEREO_OUT_R
M14
C5
VSIM_2.9V
POS
1
M13
N4
UCD300
K7
BAT300
PWR_KEEP
JIG_ON
PWR_ON
P6
E8
E9
C320
E5
MOTOR_EN
C4
L7
VIB_RNG_EN
C321
NEG
2
F14
N6
CLK26M_ABB
R6
CLK_EN_ABB
J5
J6
H6
R4
FLASH_RST
RST
P5
KEY_BL1
D7
D9
G3
G4
KEY_BL2
C7
C323
C324
C325
K13
VAMICREF
RXTX_DATA
RXTX_EN
RTX_I_N
RTX_I_P
RTX_Q_N
RTX_Q_P
N2
K10
R2
K12
C327
OSC300
C328
J3
J4
J11
C326
L14
K3
K4
F13
K11
C329
H5
M10
PAM_VRAMP
UP_CS
UP_SCLK
UP_SDI
UP_SDO
TXPSTB
L5
P10
R10
VBAT
VBAT
P12
P13
M9
VLDO_COREA_S
C10
B10
C6
A6
E11
E13
D6
E2
E14
A14
F12
D14
1
2
C15
C332
C333
C335
C336
C331
B15
C12
D13
GND_SW
GND_SW
9-4
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348569902.083.png 348569902.084.png 348569902.085.png 348569902.086.png 348569902.087.png 348569902.088.png
 
Flow Chart of Troubleshooting
9-1-3. Sim Part
"Insert SIM is displayed on the LCD
Yes
Check the SIM connector's
(SIM600) connection to
SIM card
No
Resolder or change SIM600
Yes
Check the voltage at pin#1
of SIM600 >= 2.8V ?
No
Check the UCD300
Yes
No
Is there any signals
pin#2,#3,#4 of SIM600 ?
Check the UCD300
Yes
Check the SIM Card
END
9-5
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