Samsung SGH-M8910B, GT-M8910B TSHOO
9. Flow Chart of Troubleshooting
9-1-1.
Power ON
Power On' does not work
'
Check the current consumption
Yes
Current consumption
Check the Vbat Voltage
Voltage
Check the pin of PMIC400
Pin#J12
Pin#B7
>= 100
mA
Yes
>=3.3V
Yes
:3.0V
:1.8V
Yes
No
No
No
Download again
Charge the Battery
Check PMIC400 and C413, C444, L403
Pin#A11
Check the clock signal at pin#C5 of PMIC400
Freq
Check the initial operation
in#B7
P
=1.2V
=
32.768khz
END
=1.3V
Yes
Yes
No
Check PMIC400 and L402, L404
Yes
No
Check the clock generation circuit
relatedtoOSC
(
400)
9-1
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Flow Chart of Troubleshooting
1
U
0
D
4
0
1
C
4
4
5
L402
C
4
4
4
L403
6
4
4
L405
C
C447
L406
OSC802
C
C
C
C
C
C
C
C
C
C
C
4
4
4
4
4
4
1
2
1
9
3
5
C401
4
5
4
C
C
C
8
2
4
4
0
0
0
4
4
4
0
9
C
R
C406
3
5
4
C
3
4
4
C
2
1
4
L404
C811
C812
C
8
0
5
C813
C
8
0
4
C
0
0
0
4
1
8
C
C
S
O
C
C
5
4
8
8
1
1
0
1
8
8
0
5
R
R
4
0
3
2
2
7
3
1
4
0
0
4
C
I
M
P
C414
C
4
5
5
C440
C436
AP_DI
C
4
4
4
4
4
2
2
2
2
2
2
7
6
0
5
C456
C
R
R
4
4
4
0
0
0
5
6
7
3
1
4
C
9
0
4
C
9
3
4
C
1
4
4
C
0
5
4
C
8
3
4
C
4
3
4
C
2
5
0
3
4
C
4
C
3
2
4
C
C
8
4
3
4
5
4
C
8
R
3
0
1
R
3
2
U302
0
0
L
4
0
4
0
U
3
0
4
C
0
0
4
8
2
4
4
0
4
C
C
C
4
2
9
R705
D
4
0
0
0
1
4
R
9
0
4
R
R
4
0
5
C
4
3
1
7
3
4
C
0
0
1
R
0
7
6
0
7
R
Q
U
C
4
7
4
2
0
R
2
4
0
8
3
U
0
7
D
6
Z
0
5
2
0
6
R
C
6
4
0
C
3
2
2
0
D
3
0
5
L
O
V
_
M
A
C
9-2
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Flow Chart of Troubleshooting
9-1-2.
Initial
Initial Failure
Yes
The pin#B6 of
and
1.
V
325
the pin#B3 of
1.8V ?
Is the pin#A14 of PMIC400
Low→High"
"
There is
forms at the
32.768
C436
PMIC400
PMIC400
Yes
?
Yes
kHz wave
and
=
C440
No
if it has some problem, it is to be replaced.)
=
No
No
(
if it has some problem, it is to be replaced.)
(
Check the PMIC400
Check the PMIC400
Check the OSC400
Yes
The voltage is"High" at the
C426, C427
C416,
C415,
Yes
LCD display is O.K
Yes
Sound is O.K
Yes
END
No
Check the PMIC400
No
Check the LCD part
No
Check the Audio part
9-3
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Flow Chart of Troubleshooting
9-4
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Flow Chart of Troubleshooting
9-1-3.
Sim Part
Insert SIM is displayed on the LCD
"
Yes
Check the SIM connector's
T/SIM
(
pin#9,
Is there any signals
connection to
400)
SIM card
Yes
Is there any signals
only pin#10,#11 of
#10,#11
T/SIM
of T/SIM
Yes
400 ?
400 ?
No
No
No
Resolder or change T/SIM
Check the HEA601
Check the U605
400
Yes
Check the voltage at pin#9
of T/SIM
400 >= 2.8V ?
Yes
Is there any signals
only pin#11 of T/SIM
Check the U702
END
400 ?
Yes
Yes
No
Check the PMIC201
No
Check theUCP300
9-5
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Flow Chart of Troubleshooting
9
4
1
R
6
2
4
C
1
6
4
C467
C
6
6
C
4
C465
4
6
C
4
C463
T/SIM400
1
0
4
C
R
R
4
4
1
1
4
7
4
1
C
6
7
4
1
C
R
R
4
4
1
1
5
3
4
1
C
8
4
1
R
6
4
1
C
1
5
1
R
2
R513
D
5
0
Z
0
Z
D
5
0
Z
1
D
7
0
4
3
7
1
C
C712
5
4
C
3
5
3
5
C
8
U
5
0
7
8
2
5
1
R
6
4
1
R
R509
6
U
5
0
C
5
U509
C527
9-6
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Flow Chart of Troubleshooting
9-1-4.
MAIN Microphone Part
Check main microphone function in voice call
receiver mode
No
Check the Voltage at
L613
=1.8V
Yes
Check component soldering
status at
R504, C508, C511 and
C512
Yes
Change the Send-end key
FPCB ass'y
Yes
END
No
Resolder or change UCP300
No
Resolder or change the components
9-7
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Flow Chart of Troubleshooting
9-1-5.
Sub Microphone
Check sub microphone function in voice call loud mode
No
Check the connection status
of HEA602
Yes
Check voltage level at
C610
=2.6V
Yes
Check component soldering
R500,R501,R505,C500,C501,
status at
C502,C504,C505,L506 and
L508
Yes
No
Reconnect the HEA602
No
Resolder or change PMIC400
No
Resolder or change the components
Check the connection status
of HEA602
Yes
END
9-8
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Flow Chart of Troubleshooting
9-1-6.
SPK Part
Play MP3 with maximum volume level.
Check speaker function.
No
Check the signal output of
TP400,TP401,TP403..
Yes
Check the signal output of
C286 and C287.
Yes
Check the signal signal
output of C602 and C603.
Yes
Check the connection of
HEA601
No
No
No
Resolder or change UCP701
Check component soldering
U400,C404,C408,C409,C418,
Resolder or change the components.
Reconnect HEA601
status at
C421,C422
NO
Yes
Replace the speaker module.
Yes
End
9-9
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