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Flow Chart of Troubleshooting and Circuit Diagram
5-12 SGH-A300 GSM Transmit
Tx On (level : 5)
Battery voltage : 3.8 V
U505
Pin 9
30 dBm
U505
Pin 1
30 dBm
LAM1
Pin 3
30 dBm
U510
pin 4
0 dBm
U513 pin 3
1~2.3V ?
U513
Pin 9 : H
Pin 7 : L
Change U513
END
N
N
Y
N
Y
N
Y
N
N
Y
Y
Y
Y
SAMSUNG Proprietary-Contents may change without notice
Y
Check voltage
Pin 2 : H
Pin 4 : L
Pin 8 : H
Pin 10 : L
N
Resolder or Change
LAM1
Check
U510 pin14
1V ~ 2V ?
N
Check
OSC300 pin1
-10 dBm
Y
Resolder or Change
U512
5-12
Resolder
CN500
Resolder or Change
Y
U505
Resolder or Change
U503, Q501
Change
Y
U510
Change
U508
N
Change OSC300
Change U300
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