Samsung SGH-B300 Service Manual page 26

Flow Chart of Troubleshooting
ANT
GSM_RX
GSM_TX
DCS_RX
DCS_TX
FM_RADIO
SPK
MAIN_MIC
EAR_SPK
EAR_MIC
POWER_ON
SIM
CHARGING
LCD
MOT
CLK
SPK_N
R427
AOUTAN
MAIN_N
C417
VCCD_2.9V
37
D(1) D1
38
D(0) D0|AURXD
39
CP_WEN _WR|AUTXD
40
YMU_EN _CS|AUSTB
41
A(1) A0
42
CP_OEN _RD|AUCLK
U403
43 IFSEL
44
NC
45
SDATA
46
VDDIO
47
SCLK
48
LRCK
C427
49 GND
50
NC
51 NC
CLK13M_YMU
VIB_EN
YMU_IRQ
MEM_RST
VCCD_1.8V
C436
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R400
R401
MICOUTP
MICINP
MICINN
R404
R402
MICOUTN
R411
AUXOUTP
R412
AUXINP
R418
AUXINN
R420
VBAT
AUXOUTN
U402
R443
1 8
1S2 GND
2 1S1 2S1 7
3 2S2 6
VCC
C434
24
SGND
23
SVDD
22
EQ3
21
EQ2
R432
20
EQ1
C421
19
AVDD
18
HPOUT-R
17
HPOUT-L
16
AGND
C424
15
AUX1
14 C428
AUX2
13 C429
VINP
R441
R442
C430
R434
VCCD_2.9V
C432
C437
C438
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C400
C401
R403
C402 C403
VCCA_2.9V
R430
R429
C405
R413
C410
C441
C407
R419
EAR_MIC_P
EAR_MIC_N
MAIN_P
R428
AOUTAP
AS1
SPK_P
C418 R431
VBAT
C422 R433
R439 R440
AOUTBN
EAR_R
EAR_L
AMP_R
AMP_L
AOUTBP
C431
AOUTBN
10-14
MIC400
VCCD_2.9V
C419 C420
C423
C425 C426