Samsung SGH-M2710L, GT-M2710L TSHOO
9. Flow Chart of Troubleshooting
9-1.
Power On
Power On'does not work
'
Check the current consumption
more than
C323(
Check the Clock at
Yes
mA
100
Yes
Check the VBAT
more than
OSC300
VISA)
3.3V
Yes
=2.6
Yes
=32KHz
V?
No
No
No
No
Download again
Check the Battery
Check the related circuit
①
Resolder OSC300 or replace
Yes
Check the VDD_IO_LOW_1.8V
of PM300
Check PM300
VDD_IO_HIGH_2.9V
AVDD_2.6V
VDD_PLL_1.2V
Check CLK32K
Freq
Check the initial operation
=32
END
1.8V
≥
Yes
=2.6V
=1.2V
Yes
KHz
Yes
Yes
=2.9V
No
No
No
②
Check the PMU300 and C300
③
Check the PMU300 and C302, C306,
C314
④
Check the clock32KHz_DIGIT
9-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-2.
Initial
Initial Failure
Yes
PM
pin7(RSTON)="H"?
300
check the test point)
(
Yes
Check the16bit data signal
memory CE
&
END
Yes
No
Check the circuit related to reset
9-3
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-4
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-3.
Charging Part
Abnormal charging part
Check the PM300 pin
PM300 pin
>5.0V
34(
L"?
="
Yes
Yes
AUX_ON)
Yes
38
No
No
Check the circuit related to
V_EXT_CHARGE_5V
Check the circuit related to
AUX_ON signal
Check the PM300 pin
1.25V
≒
Yes
END
36
No
Resolder or replace PM300
9-5
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-6
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-4.
Sim Part
Phone can't access SIM Card
Yes
Check the SIM_VCC_3.0V
Yes
Check the SIM connector's
connector's to SIM card
①
No
Check the circuit related to C304, C331,
R317
②
No
resolder or change SIM300
Yes
Check the circuit around SIM300
input circuitry
Yes
END
③
No
Check the related circuit of SIM300
9-7
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-8
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-5.
Microphone Part
Microphone does not work
Check the connection
from MIC
C221
=2.1V?
Yes
Yes
No
No
Resolder MIC
Check the circuit related to TA401, R404,R408
Check the circuit
from UCP20
Check the MIC
0 to
Yes
Yes
END
MIC
No
No
Check the path from Main IC to MIC
Replace the MIC
9-9
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-10
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-6.
Speaker Part(Melody)
Speaker does not work
Is the terminal of speake
SPK_L_P&SPK_L_Nor
SPK_R_P&SPK_R_
Check the output circuit of
Check the
U4
00(
OK?
Yes
HIGH"
"
Yes
Audio AMP)
r
No
check the specker
①
No
N
Check the SPEAKER connector
②
No
Change or resolder around U400
Yes
Is speaker OK?
Yes
END
No
Change speaker module
9-11
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization