Samsung SGH-C250 Service Manual page 20

Flow Chart of Troubleshooting
A(22)
D(0:15)
A(0:20)
VCCD_2.9V
A(21)
CP_CSROMEN
47K
CP_CSRAMEN
LCD_CS
L200
YMU_EN
CP_WEN
CP_OEN
R208
UPPER_BYTE
RADIO_INT
YMU_IRQ
1 2
VDD OUT
VSS NC
C220
4 3 C221
KEY_COL(0:4)
U203
VCCD_2.9V
VCCD_2.9V
KEY_ROW(0:4)
R211 R212 R215 R216
I2C_CLK
I2C_DAT
DEBUG_DTR
DEBUG_RXD
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VCCD_1.8V
BP_CF
D(0) A6
XCP_D0
D(1)
B5
XCP_D1
D(2)
F8
XCP_D2
D(3)
F7
XCP_D3
D(4)
C5
XCP_D4
D(5)
D6 XCP_D5
D(6) E7
XCP_D6
D(7)
D5
XCP_D7
D(8)
C4
XCP_D8
D(9) B4
XCP_D9
D(10)
B3
XCP_D10
D(11) C1
XCP_D11
D(12)
C2
XCP_D12
D(13) D2
XCP_D13
D(14) D3
XCP_D14
D(15) E3
XCP_D15
A(0)
B13
XCP_A0_BEON
A(1)
F11
XCP_A1
A(2) E14
XCP_A2
A(3)
D15
XCP_A3
A(4)
B15
XCP_A4
A(5)
C14 XCP_A5
A(6)
A16
XCP_A6
A(7)
A15
XCP_A7
A(8) B17
XCP_A8
A(9) C17
XCP_A9
A(10)
D16
XCP_A10
A(11) F14
XCP_A11
A(12)
G14
XCP_A12
A(13) G13
XCP_A13
A(14)
G17
XCP_A14
A(15) J12
XCP_A15
A(16) K12
XCP_A16
A(17) K13
XCP_A17
A(18)
K14
XCP_A18
A(19)
L14
XCP_A19
A(20)
L15
XCP_A20
L16
XCP_A21
A12
XCP_CSROMEN
A13
XCP_CSRAMEN
M15
XPA0/CS1N
M14
XPA1/CS2N
M11
XPA2/CS3N
N14
XPA3/CS4N
C13
XCP_WEN
P16
XPA4/OEN
P15
XPA5/WAITN
T15
XPA6/BE1N
M9
INTRQ
XPA7/IRQ1
T5
XPA8/IRQ2
P2
XPA9/IRQ3
N2
XPA10/IRQ4
C217
KEY_COL(0)
KEY_COL(1)
KEY_COL(2)
KEY_COL(3)
KEY_COL(4)
KEY_ROW(0)
KEY_ROW(1)
KEY_ROW(2)
KEY_ROW(3)
KEY_ROW(4)
CHG_DET
SDS_TXD
SDS_RXD
SIMDATA
SIMCLK
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VCCD_1.8V
VCCD_2.9V
R201
C211 C212
C213
VCCD_1.8V VCCD_2.9V
VCCD_1.8V
CKO/IACK/ERAMHI
IOBIT[2]/VEC[3]/EROMHI
IOBIT[1]/VEC[4]/PLLTOA
UCP201
XTIC_MODE
XCPTSTSTOP_CKO
XBSWN
XRTCALARM_N
XOSC32OUT
3-6
VRTC_3V
C214
VREF
CLK13M_TR
TR_RST
F12
TDO
F15
TR_RST
TRST
H12
TDI
TMS G12
H13
TCK R203
G15
L12
K11
RADIO_BUSEN
N4
DSP_INT
INT#0
R12
IO7 DSP_IO
U5
DSP_RWN
RWN
DSP_AB(8:0)
T17 DSP_AB(8)
AB#8
DSP_AB(7)
T14
AB#7
DSP_AB(6)
R14
AB#6
DSP_AB(5)
P12
AB#5
P11 DSP_AB(4)
AB#4
DSP_AB(3)
N11
AB#3
DSP_AB(2)
R13
AB#2
DSP_AB(1)
M10
AB#1
DSP_AB(0)
U13
DSP_DB(15:0)
AB#0
P10 DSP_DB(15)
DB#15
R11 DSP_DB(14)
DB#14
DSP_DB(13)
T11
DB#13
U11 DSP_DB(12)
DB#12
DSP_DB(11)
M8
DB#11
N8 DSP_DB(10)
DB#10
DSP_DB(9)
N7
DB#9
P7 DSP_DB(8)
DB#8
M6 DSP_DB(7)
DB#7
R7 DSP_DB(6)
DB#6
DSP_DB(5)
T7
DB#5
DSP_DB(4)
U7
DB#4
DSP_DB(3)
P6
VBAT
DB#3
R6 DSP_DB(2)
DB#2
DB#1 U6 DSP_DB(1)
DSP_DB(0)
P5
DB#0
R205
D12
M12
R207 100K
D11
ICHRG
XAG3
E11
XAG2
A11
XAG1
B11
XAG0
R209 C216
B7
A7
X1RTC
D10
X2RTC
E8
C6
TH200
C218 C219
OSC200
TR_RST
RTCALARM
CLK32K
CP_TDO
TR_RST
CP_TDI
CP_TMS
CP_TCK
EAR_SWITCH
AUDIO_SEL
JACK_IN
PWR_KEEP
SIMRST
FLASH_RESET
LED_EN
CHG_OFF
UP_CS
UP_SCLK
UP_SDO
UP_SDI
VCCB_2.9V
R206
R210