Page 1
2. SGH-E300 Flow Chart of Troubleshooting
1.Baseband
1. Power ON
'Power On' does not work
Yes
Check the current
consumption more
than 100mA
Yes
Check the Voltage
more than 3.3V
Yes
Check the pin
11 of U102 is more
than 2.8V
Yes
U102 pin 33,39
=2.8V
Yes
No
No
No
No
Download again
Charge the Battery
Check U102 and C117
U102 pin 9
=1.8V
Yes
No
Check U102 and C116
Check the clock
signal at pin4 of
OSC801
Freq=13MHz ?
Vrms≥300mV ?
Vpp is around
900mVpp ?
Yes
Check the initial operation
END
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No
Check the clock generation
circuit
2-1
Page 2
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2. Initial
Initial Failure
Yes
Check the signal at the
pin19ofU102is
"High" when the phone
is boot on
Yes
Check the pin 25 of
U100 is "High"
Yes
Check the pin 4 of
OSC801 is around 2.8V
Yes
Check LCD connector CN201,
and resolder bridge
Yes
END
No
No
No
Check U102
Check the U701
Check the soldered status of
OSC801,R801,U102
3. Sim Part
Phone can't access SIM card
Yes
Check the pin 1 of
CN100. voltage 3V ?
Yes
Check the SIM
connector's (CN100)
connection to SIM
card
Yes
Check the circuit around CN100
Check the circuit around U601
and vlotage supply circuitry
input
circuitry
Yes
output
Yes
END
No
No
No
No
2-2
Check the circuit related to
Resolder or change CN100
Check the related circuit of
CN100
Check the related circuit of
U601 and U102
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U102
Page 3
4. Charging Part
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
Abnormal charging part
Yes
Check the pin 17, 18
of CN300 is
TA_VEXT>4?
Yes
Check the pin 2 of
Q102 is "low"?
Yes
Check the pin 3 of
Q100 is "low"?
Yes
Check the pin 5 of
Q102 is "3.2~4.2V"?
Yes
Check the ICHRG is
1V(during charging)
and around 180mV(full
charging)?
No
No
No
No
No
Replace TA,Check CN300
Check the Q102
Check the Q100
Check the Q102
Resolder or change R102
Yes
END
2-3
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Page 4
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
( Picture 1)
2-4
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Page 5
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
(Picture 2)
2-5
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Page 6
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
(Picture 3)
2-6
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Page 7
5. Microphone Part
Microphone does not work
Yes
check the soldered
status of microphone.
Yes
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
No
Resolder microphone
6. Speaker Part
Check the reference
voltage on mic path
C431 ≒ 2.5 V
Yes
Is microphone ok?
Yes
END
Speaker does not work
Yes
Check the connection
from CN201 to LCD
module
Yes
No
No
Resolder or change
R424,C431,R413,C410,R408,R411
Check U701
No
Check the circuit related to U401
Check the PIN 4 of
U401='High' and
U409='High'?
Yes
Is speaker ok?
Yes
Is speaker ok?
Yes
END
No
No
No
Check U601
Check U701
Change Speaker
2-7
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Page 8
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-8
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Page 9
7. Camera Part
"Camera" function dose not work
Yes
Check the connect
CN201
Yes
U1002 PIN 9,10 = 2.8V?
Yes
R1020 = 25MHz
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
No
Connect the camera module
No
Check U1002 and C1022,C1021
No
Check U1001 and OSC1000
END
2-9
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Page 10
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2-10
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Page 11
2.RF
1. EGSM RX
NORMAL CONDITION
catch the channel?
YES
F900 CHECK
pin8 ≥ -65dBm ?
YES
F900 CHECK
pin2,3 ≥ -65dBm ?
YES
U800 CHECK
pin20,21 ≥ -65dBm ?
NO
NO
NO
NO
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
CONTINUOUS RX ON
RF INPUT : 62CH
CHECK
ANT701,L905 contact ?
C900, F901
resolder or change
F900
resolder or change
C912,C913,L901
resolder or change
AMP : -50dBm
YES
U800
pin 9,32: 2.8V ?
YES
U800 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
YES
U800
pin1,2,3,28 Vp-p
: 120mV ?
YES
U701 CHECK!!
NO
NO
NO
U102 pin39, C112
change or resolder
OSC801
change or resolder
U800
resolder or change
2-11
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Page 12
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
2. DCS RX
NORMAL CONDITION
catch the channel?
YES
F900 CHECK
pin8 ≥ -65dBm ?
YES
F900 CHECK
pin4,5 ≥ -65dBm ?
YES
U800 CHECK
pin18, 19 ≥ -65dBm ?
NO
NO
NO
NO
CHECK
ANT701,L905 contact ?
C900, F901
resolder or change
F900
resolder or change
C914,C915,L902
resolder or change
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
YES
U800
pin 9, 32: 2.8V ?
YES
U800 CHECK
pin 8 : 13MHz ?
Vp-p : 950mV?
YES
U800
pin1,2,3,28 Vp-p
: 120mV ?
YES
U701 CHECK!!
NO
NO
NO
U102 pin39, C112
change or resolder
OSC801
change or resolder
U800
resolder or change
2-12
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Page 13
3. EGSM TX
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
F900 pin 13 :
about 2~3 dBm?
YES
F901, C900,L905
check&change
NO
change or resolder
NO
NO
U900
pin8,20:3.7V?
YES
U900
pin 22 : 1.6V ?
YES
U900 pin6
about : -5dBm ?
YES
U900
pin 2 : 3V?
YES
U900
F900
pin1 : 2.8 V?
U900 pin12 :
about 4~5dBm?
F900
check & change
NO
BATTERY, U102
check & change
NO
NO
U701
check
YES
YES
check
U701
NO
U702,U703
check & change
CONTINUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
U102 pin39, C112
change or resolder
NO
U800
pin9,32 : 2.8V ?
YES
U800
pin8 : 13MHz ?
Vp-p : 950mV?
NO
change or resolder
OSC801
YES
NO
U800
pin4,5,6,7:100mV?
YES
U701
change or resolder
U800
change or resolder
2-13
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Page 14
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
5. DCS TX
F900 pin 13 :
about 2~3 dBm?
YES
F901, C900,L905
check&change
NO
NO
NO
U900
pin8,20:3.7V?
YES
U900
pin 22 : 1.4V ?
YES
U900 pin5 about
:-5dBm?
YES
U900
pin 2 : 3V?
F900
pin6 : 2.8 V?
U900 pin11 :
about 4~5dBm?
F900
check & change
NO
BATTERY, U102
check & change
NO
NO
YES
YES
U701
check
NO
U702,U703
check & change
CONTINUOUS TX ON CONDITION
CH : 698CH(DCS)
TX POWER CODE: 520 CODE Aplied
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
U102 pin39, C112
change or resolder
YES
U900
change or resolder
NO
change or resolder
U800
pin9,32 : 2.8V ?
NO
U701
U701
check
YES
U800
pin8 : 13MHz ?
Vp-p : 950mV?
YES
U800
pin4,5,6,7:100mV?
YES
U800
change or resolder
NO
change or resolder
OSC801
2-14
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Page 15
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
(Picture 1)
2-15
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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
(Picture 2)
2-16
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Page 17
SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams
(Picture 3)
2-17
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