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SAMSUNG Proprietary-Contents may change without notice
SGH-i300 Flow Chart of Troubleshooting and Circuit Diagrams
2-10
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2-7. Receiver Part
Receiver does not work
Yes
END
Check the
R434,R437 = sine wave
Replace Receiver
No
Yes
Yes
Check the
Pin 2,10 of U409
is sine wave
Check the Pin 4,8 of
U409
No
Yes
Check the
pin 3,9 of U409 is
Sine wave
Check the Pin 4,8 of
U409
No
Yes
Check the
Pin 35,36 of U401
is Sine wave
Hardware Reset or
resoldering or
Download Image
No
EAR MP3
EAR RCV
MAIN MP3
MAIN RCV
8
3
4
T
U
O
D
N
G
K
P
S
4
3
L
K
P
S
5
3
R
K
P
S
6
3
SPKVDD
0
3
O
N
O
M
1
3
OUT3
7
3
3
3
HPGND
HPL
9
3
2
P
A
C
2
3
MIC_WM_OUTN
MIC_WM_OUTP
P
O
P
_
R
A
E
LOUD_SPKL
EAR_RCVN
EAR_RCVP
U401
10
NO2V+
1
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
NC2
7
2
NO1
U409
COM1
3
AUDIO30
C493
EAR_SPKL
JACK_S
EAR_SPKR
RCVN
RCVP
EAR_RCVN
JACK_S
EAR_RCVP