Samsung SGH-X620 Service Manual page 28

Flow Chart of Troubleshooting
Power On
CHARGER_OK
MIC_BIAS
C309
C310
C311
C312
BLVDD
R312
V_ISUP
BAT300
BLVDD
C314
BACKLIGHT
C316
VCC_RX_TX VCC_SYN
VCC_TX_BURST VCC_RF_VCO
PON_SYNT
PON_TX
C323 C324 C352
VDD1
R305
IT_PMU
JIG_REC
RECO1
JACK_IN
32K
RSTON
ONKEY_N
REF_ON
U305
H5
TM
SCL
E3
SCL
F2 SDA
INTERFACE
SDA
H8
REFC
K6
REFGND
REFERENCE
refgnd
VBAT
J6 MICBIAS
C315
TEMP HIGH
K4 VBAT
J5
VBACK
H6
ISUPA
J4
ISUPD
B7
BLVBAT
A7
BLVDD
C5
BBMSW
VBAT
A8
BBMGND
G9
RFVBAT
G10
RF1VDD
F10
RF1SNS
H10
RF2VDD
H9 RF2SNS
E8
RF1SWS
F9
RF1VDDS
E10
RF2SWS
J10
RF2VDDS
C325 C326 C327 C328
H7 E4 F5 F4 G4J3 G5
VDD_KEY VDD3 VDD2
VDD_KEY_ON
C336 C338
C337
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C301
C304
D10 K3 H3 D9 A9 J2 K1 K2 C10 B2 A2 B1 A1
SIM
CHARGE
PUMP
ON/OFF
12C
CONTROL
control
status
data
SIM
INTERFACE
ON-CHIP
reference
voltage
&
internal CLOCK
MIC BIAS bias currents
clocks
GENERATOR
calibration
32KHz XTAL
PLL
OSCILLATOR
htmp
SENSOR
REAL-TIME
CLOCK
BATTERY
INTERNAL VBAT
VOLTAGE
SUPPLY
MONITOR
MODULE
internal
CHARGE
supply
CONTROL
BACKLIGHT
SUPPLY &
CONTROL
LINREG
HIGH VOLTAGE
SUPPLY
(CHARGE
SWITCH
PUMP+
LINREG)
K5 F6 G6 G7 G8F7E6 E7D7 C7 D6E5 D5 D4 C4 F1 F3 E9 G3 G2 G1 H4 H2 H1J1 F8 B4 A4 J8 J9 J7 K7
VDD1 V_ISUP
C334
C339
POWER MANAGERMENT UNIT(PMU IC)
7- 2
VBAT
C300
CN300
1 1 6 6
C302 C303
22 5 5
34 3 4
G G G G
10 9 8 7
C2
VCC
C3
CLK
C1
RST
D2
IO
D1
CPRES
B8
SIMIO SIMIO
C6
SIMCLK SIMCLK
K8
OSC32I
K9
OSC32O
R302
VBAT
D3
X300
CHRVBAT
E2
CHRREG
CHRIV E1
C318
VCC_CP
HVSVBAT C8
B9
HVSGND
C9
HVSSCP
A10
HVSSCN
B10
HVSOC
D8
HVSVDD
L301 C320
C322
2
NC
NC 1
K10 A5 B5 A6B6 B3 A3
VBAT VIBVDD AVDD_TEMP
TP300
C333
C331
C335
C313
C317
VBAT
C319
C321
AVDD
C332