Samsung SGH-D840 Schematics
9. Flow Chart of Troubleshooting
9-1.Baseband
9-1-1. Power ON
'Power On' dose not work
YES
Check the current
consumption more
than 100mA
YES
Check the Vbat more
than 3.3V
YES
Check the VLDO7_1.8V
of U300 is more than 1.
8V
YES
Check VCCD_1.8V
of U307=1.8V
NO
Down load again
NO
Change the Battery
NO
Check U300 and C315
NO
Check C340 of U307
YES
Check VRF of
U300=2.9V
YES
Check C130
Freq=13MHz, Vpp>0.4V
YES
Check the initial operation
YES
END
9-1
NO
Check U300 and C317
NO
ChecktheclockC130
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Flow Chart of Troubleshooting
9-2
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U300
SIM_IO
SIM_RST
SIM_CLK
VSIM
VRTC
LED2_DRV
LED1_DRV
RING_DRV
VIB_DRV
VLDO_7
VLDO_6
VL5S_B
VL5S_A
VLDO_5
VL4S_B
VL4S_A
VLDO_4
VLDO_3
VLDO_2
VLDO_1
VACC
J11
K11
K14
K12
H11
G12
G13
F13
F15
C12
A14
C9
D10
B10
B11
A12
B12
A13
J12
G11
F14
DCS_TX_EN
GSM_TX_EN
SIM_IO
SIM_RST
SIM_CLK
VSIM_3.0V
VCCB_2.9V
C314
VCCD_1.8V_PSC
C313
Flow Chart of Troubleshooting
VCCA_2.9V VLDO1_1.5V
C315
C316
VRF_2.9V
C317
VCCD_2.9V
C318
C319
C320
VRTC_1.5V
R304
S
O
P
G
E
N
BAT300
2
VBAT
VCCD_1.8V
C339
L302
C340
C337
1
2
3
4
5
VFB1
VOUT
VIN
SW1
GND
U307
GND
11
VFB2
OUT2
RUN1
SW2
RUN2
10
9
8
7
6
HP_CORE_1.6V
C338
D302
R324
VLDO1_1.5V
L303
C341
9-3
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Flow Chart of Troubleshooting
9-1-2. Initial
Initial Failure
YES
Check VCCD,
VDDC_1.8V of U300
"High" when the phone
is boot on
YES
Check the VCCD_1.8V
of U307 is "High"
YES
LCD display is O.K?
YES
Sound is O.K?
YES
END
NO
Check U300
NO
Check U307
NO
Check HDC501 and LCD PART
NO
Check Audio PART
9-4
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Flow Chart of Troubleshooting
SPK+
SPK-
LCD_ADS
MLCD_CS
LCD_WEN
LCD_RESET
LCD_D(15)
LCD_D(13)
LCD_D(11)
LCD_D(9)
LCD_D(7)
LCD_D(5)
LCD_D(3)
LCD_D(1)
C532
10
F511
45
3
2
1
F512
4
3
2
1
F513
45
3
2
1
9
GNDGND
IN4
OUT4
IN3
OUT3
OUT2
IN2
OUT1
IN1
910
GND
GND
IN4 OUT4
IN3
OUT3
IN2
OUT2
IN1
OUT1
9
10
GNDGND
IN4
OUT4
IN3
OUT3
OUT2
IN2
OUT1
IN1
C533
VMOT_3.3V
VBAT_LCD
VLCD_3.0V
VCCD_2.9V
VCCD_1.8V
R537
R542
R541
353 6
R540
C519
R544
R545
8
VR539
3
8
7
6
8
7
6
5
LCD_CHECK
5
R
V
OUT1
OUT2
OUT3
OUT4
OUT1
OUT2
OUT3
GND GND
9
10
GND
GND
910
IN1
IN2
IN3
IN4
F509
IN1
IN2
IN3
IN4OUT4
F510
R554
R555
1
2
3
45
1
2
3
4
22
44
1010
16
20
20
28
28
3030
NC
R561
R560
Q500
1G
3
D
2S
R562
1
2
1
1
5
5
R
R
V
V
HDC501
11
6
7
8
5
6
7
8
6
7
8
33
5566
77 8 8
99
1111 1212
1313 14 14
15 16
15
1717 1818
19
19
21 21 2222
23
232424
25 25 2626
27
27
2929
31
313232
33 33 3434
NC
HALL_SENSOR
OLED_EN
SLCD_CS
LED+
LED-
LCD_D(14)
LCD_D(12)
LCD_D(10)
LCD_D(8)
LCD_D(6)
LCD_D(4)
LCD_D(2)
LCD_D(0)
9-5
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Flow Chart of Troubleshooting
9-1-3. Sim Part
Phone can't access SIM Card
YES
Check the pin 1 of
SIM300 Voltage = 3V
YES
Check the SIM
connector's to SIM card
YES
Check the related circuit of SIM300
YES
Check the circuit around U300 output and
voltage s upply circuitry
YES
END
NO
NO
NO
NO
Check the circuit related to
U300
Resolder or change
SIM300
Check the related circuit of
SIM300
Check the related circuit of
U300
VSIM_3.0V
SIM_RST
SIM300
6
6
5
5
4
12
12
11
11
10
10
13GG1415GG16
C301
1
1
2
2
34
3
7
7
8
8
9
C302 C303C300
0
1
0
3
R
V
2
0
0
3
3
R
R
V
V
9
9-6
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SIM_IOSIM_CLK
C304
3
0
3
R
V
9-1-4. Charging Part
Abnormal chargin part
Flow Chart of Troubleshooting
YES
AUXOUTP
AUXINP
AUXINN
AUXOUTN
Battery contact at
BTC500?
Charger input of
IFC500?
END
R527
R530
R532
R533
C514 C515
YES
YES
C512
C513
NO
Battery Check
BTC500
NO
Check the IFC500
VCCA_2.9V
R516
C503
R529
C511
VR504
VR503
R528
EAR_SWITCH
JACK_IN
EAR_CHECK
T_OPT
SDS_RXD
JIG_ON_IF
USB_D+
USB_D-
USB_5.0V
TA_VEXT
EAR_R
EAR_L
R539
R543
C521
VCCD_1.8V
C535
C534
VR515
VR505
R546
C520
C523
C522
R548
R547
R549
R550
R551
R552
R553
R556
6
5
4
VR540
2
3
1
ZD506
ZD507
VR508
ZD505
ZD503
VBAT
IFC500
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
21
25
NC
NC
22
26
NC
NC
23
27
NC
NC
28
24
NC
NC
C524
9-7
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Flow Chart of Troubleshooting
9-1-5. Microphone Part
M i crophone do es no t work
Check the
assembled status of
microphon e.
YES
Check th e ref erence
volta ge on mic path
R435=2.9V
YES
Is microphone ok?
YES
END
NO
NO
NO
Rea sse m bl age microp hone
resolder or chang e
(R435,R438,R439,R440,
R443,C440,C443,U407)
Check U300
9-8
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Flow Chart of Troubleshooting
MICINP
MICOUTP
MICINN
MICOUTN
R441
R444
C449
C455
VCCA_2.9V
R440
R443
R435
C446
C448
C454
R439
C445
R438
MAIN_MIC+
MAIN_MIC-
MAIN_MIC+
MIC+
AK_MIC+
MIC+
MIC-
C452
C456
VCCD_2.9V
U407
10
S2A
9
D2
8
IN2
7
S2B
6
GND
C453
VDD
S1A
IN1
S1B
1
2
3
D1
4
TP400
5
MAIN_MIC-
MIC-
MIC_SEL
AK_MIC-
MIC400
1
2
0
0
4
4
R
R
V
V
9-9
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