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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