A SERVICE OF

logo

SAMSUNG Proprietary-Contents may change without notice
SGH-I300 Flow Chart of Troubleshooting and Circuit Diagrams
2-7
This Document can not be used without Samsung's authorization
2-5. Microphone Phone
Microphone does not work
Yes
Yes
Resolder
R424,R426,R430,R431
No
No
Hardware reset or
resoldering or
Download Image
Yes
Check the
Pin 23 of U401=
sine wave
Audio loopback is enabled
by board test program
R424,R431 = 2.2V
END
Check the
connecttion from CN602
Change Main key FPCB
No
Yes
ADC
SPK_COM
P_BAT
MIC_N
SPK_N
MIC_P
P_GND
INT
N.C
SPK_P
R424
3
1
Q402
2
C444
C450
C440
C457
AUDIO30
R438
R432
C442
R430
R426
C459
C490C489
C460
G
12 13
GG
14
4
5
6
7
8
9
11
G
EAR401
1
10
2
3
BAT33BAT33
C491
C446
R431
R436
3
0
4
D
Z
C453
C456
C452
R401
C455
1
2
3
4
5
6
ZD402
AUDIO30
R439
R425
R435
MICINN
EAR_SPKR
AUXINN
JACK_S
NC_GND
MIC+
MIC-
EAR_SPKL
SEND_END
AUXINP
MICINP