Samsung C3752 Block Diagram 7
Level
8.
Block Diagram
8-1.
Repair
3
8-1
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PCB Diagrams
8-2.
8-2-1.
Top
8-2
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8-2-1.
Bottom
8-3
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Flow Chart of Troubleshooting
8-3.
presetting methods for checking TP
※
GND&TP(exp. VBAT=
-
look over the coming out signal.
-
C105
using Oscilloscope
)
Oscilloscope
←
TP(Test Point) GND
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8-4
Multi-meter
←
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Checking the TP(test point) using Multi-meter
←
EX) to look up the TP, shunt Cap.
-
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-
if checking the GND, you can listen"beep"
if checking the Signal, you can't listen it.
8-5
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8-3.
8-3-1.
LOGIC
Power On
Power On'does not work
'
Check the Battery Voltage
is more than
Check the Clock at
OSC200(C227, C228,
32.768
Yes
TP:C315, C316)
(
kHz,
3.5V
Yes
±20
Yes
ppm)
No
Change the Battery
No
replace the OSC200
VDD_1.8V
TP: C231)
(
Check the Clock at
OSC201
when normal operating
(
condition,26MHz
Check the initial operation
END
=1.8
Yes
pin
1,3
±11
Yes
Yes
V?
ppm)
No
No
Check the Main Chip related to
SD1_FB=1.8V(TP:C231)
to lookover the Chip damage)
(
Check the Main Chip
to lookover the Chip damage)
(
(TP:
OSC201
pin/look over the waverform
1,3
using the oscilloscope)
8-6
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8-7
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8-8
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8-3-2.
Initial
Initial Failure
Yes
R206(RST_BB
measure GND&SHORT PAD
,
using the oscilloscope
LCD_RST
(TP:
)>1.7V?
Yes
>1.7V?
HEA400 pin9)
Yes
.
No
Resolder R206, must be higher than
No
Change PBA.
1.7
V.
Check the16bit data signals.
Yes
END
8-9
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the5th pin from the the top of left pin.
8-10
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8-3-3.
Charging Part
Abnormal charging part
U403 pin E6(VBUS_5V_IN,
C400)
check the D400(short)
and C415, C400(short)
Yes
No
4.2V
≥
Yes
No
Yes
Resolder IFC400
Replace D400
or open the C415, C400
Check the Battery and TA
is connected correctly
Yes
END
8-11
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8-12
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8-3-4.
Sim Part(SIM1)
Phone can't access SIM Card
SIM300 pin1(C302), pin4(C305)
3.0V?
≥
and
pin3(SIM_CLK)
Yes
≥
Yes
3
MHz
No
Resolder or Replace SIM300
?
Check signal sequence,
VSIM1_3.0V(C302)
SIM_IO(C305)→SIM_CLK(C304)
Check the SIM Card(is broken?)
SIM_RST(C303)
→
END
→
Yes
Yes
No
Change PBA
8-13
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8-14
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