Samsung B7330 Schematic
9. Flow Chart of Troubleshooting
LOGIC
9-1.
9-1-1.
Power On
Power switch on
Check the current
consumption
>= 100
Check the battery
Check the TP_PS_
HOLD pin PS_HOL
NG
mA?
Yes
voltage
>= 3.45?
Yes
D=2.6
V?
NO
NO
NO
Download
Change the battery
Check the PMIC
relatedtoPS_HOLD
Yes
Check the clock at
OSC400
=32
KHz
?
Yes
C420(VREG_MSMC1)=1.2V?
C418(VREG_MSMC2)=1.2V?
C417(VREG_MSME)=1.8V?
C410(VREG_MSMP)=2.6V?
C409(VREG_MSMA)=2.6V?
Yes
Check the clock
C148
=19.2
Mhz
?
Yes
Check the initial operation
NO
Resolder OSC400
NO
Check the U401
NO
Check the clock generation circuit
9-1
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Flow Chart of Troubleshooting
9-2
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Flow Chart of Troubleshooting
9-3
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Flow Chart of Troubleshooting
9-4
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Flow Chart of Troubleshooting
9-5
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Flow Chart of Troubleshooting
9-1-2.
LCD Working
Power Switch On
LCD Display
On?
Yes
NO
LCD FPCB
connector is co
rrectly connecti
ng?
Yes
F703, F704,
F705, F706,
F707 Correctly
mounted?
Yes
NO
NO
correctly connect
F703, F704, F705,
F706, F707
Resolder
Yes
LCD
Replace
C707
LED+_18V=18V?
NO
Replace U700&Check
neighboring circuits
Yes
9-6
Yes
U706
Replace
C704, C703
VLCD_IO_2.6=2.6V
VLCD_3.0V
=3.0V
NO
U706
rd,4th pin
3
LCD_EN=High
NO
Change
Main PBA
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Flow Chart of Troubleshooting
9-7
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Flow Chart of Troubleshooting
9-8
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Flow Chart of Troubleshooting
9-1-3.
z
Audio Working
Speaker(Receiver) Working
Operate speaker
NG
Connect
Speaker Module
FPCB correctly?
YES
Speaker break
down?
NO
NO
YES
Connect correctly
Change speaker
ASSY
Signal on in
C501,C512
SPK mode)/
(
C502,C513
RCV mode)?
(
NO
Signal on in
C506, C507
SPK mode)?
(
NO
YES
YES
SPK ASSY
FPCB break
down?
NO
Check
RCV mode) pins in
7,9(
SPK mode)
1,3(
HEA500
Replace U600
YES
Change
SPK ASSY
/
Change main PBA
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9-9
Flow Chart of Troubleshooting
9-10
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Flow Chart of Troubleshooting
9-11
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Flow Chart of Troubleshooting
z
MICW
orking
Operate MIC
NG
Insert
MIC rubber
correctly?
YES
Pollute
MIC Hole?
NO
YES
Insert correctly
Clean up
MIC hole
NO
Check
C516=High?
YES
Change MIC
NO
Remove MIC,
Check MIC5th pin
MIC_BIAS_1.8V)
(
=1.8V?
YES
Change MIC
NO
Change main PBA
9-12
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Flow Chart of Troubleshooting
9-13
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z
Hands-Free Stereo Headset Working
Hands-free stereo
headset
NG
YES
Button NG?
NO
Flow Chart of Troubleshooting
Check U707&U600
MIC NG?
NO
SPK NG?
NO
The End
YES
YES
Check
R606
=1.8
V?
YES
Check U707&U600
Signal on
in C601,
C605?
NO
Signal on
in C508,
C509?
NO
NO
Check U703
YES
Check U707&U600
YES
Check U500
Change Main PBA
9-14
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Flow Chart of Troubleshooting
9-15
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Flow Chart of Troubleshooting
9-16
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Flow Chart of Troubleshooting
9-17
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Flow Chart of Troubleshooting
9-1-4.
z
KEY Working
Navi KEY
Press Navi Key
All key NG?
UP/DOWN NG?
NG
YES
Change Front Ass'y(Key FPCB)
NO
YES
Check R507, R508
NO
Acceleration NG?
NO
END
YES
Check ZD509, ZD510
9-18
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Flow Chart of Troubleshooting
9-19
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POWER KEY, VOLUME KEY, MAIN KEY PART
z
Press Power key,
Volume Key, Main Key
Flow Chart of Troubleshooting
Power Key NG?
NO
Volume Key
NG?
NO
Yes
Yes
Pressing
power key,
R506=High?
NO
Change Front Ass'y
st pin of TAC500,
1
TAC501=High
Yes
Pressing Vol key
ZD505, ZD506
High
=
?
NO
Check TAC500, TAC501
Yes
NO
Yes
Check U501
Neighboring Circuits
&
Change Main PBA
Change Main PBA
QWERTY Key
NG?
NO
The End
Yes
Key FPCB
Disconnect or
Break Down
?
Yes
NO
Check HEA501
Neighboring Circuits
&
9-20
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Connect correctly or
Change Front Ass'y
Flow Chart of Troubleshooting
9-21
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Flow Chart of Troubleshooting
9-1-5.
Vibrator Working
Operate Vibrator
Connect SPK Mo
dule correctly?
Check C510
=3.3V?
NO
Yes
Yes
NO
Connect correctly
Check D500, TA500
Neighboring Circuit
&
rd pin in
3
High?
=
Change PBA
NO
U704
NO
Yes
Change U704
9-22
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Flow Chart of Troubleshooting
9-23
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