Samsung SM-G355M Troubleshooting

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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8-2-2.

Bottom

8-3

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Flow Chart of Troubleshooting

8-3.

8-3-1.

Power On

Power on

No

Check the current

consumption

>= 100

mA?

Yes

Check the battery

voltage VBAT

>= 3.45

V?

Yes

Check CLK

in OSC400 PIN

=32.768k

Hz?

Yes

END

No

No

No

Download the latest binary.

Change the battery

Change OSC400 or PBA

8-4

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8-3-2.

Initial

Power on

Check CLK

in OSC400 PIN

=32.768k

Check

UCP300 connection

No

No

Change OSC400 or PBA

Hz?

Yes

No

Resolder or replace UCP300

Yes

END

8-5

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8-6

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8-7

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8-3-3.

Charging Part

Abnormal Charging

Check the voltage

VBUS

Check the Battery

TA connection

&

Yes

V_IF

_5.0

>= 5

V?

No

No

Insert the battery or TA

Check
short to GND or damage)

(

Change

C472,

C472,

C473,ZD405

C473,ZD405

Yes

Check the

SMD or Damage)?

(

U403

No

END

Yes

Change the

U403

8-8

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(

)

IFC400

1
2
3
4
5

S1
S2

NC
NC
NC
NC
NC
NC

Level3Repair

V_BAT

R420

R421

U402

A1

A2

VOUTVIN

B1

B2

VOUTVIN

C2

C1

ON

GND

C

C

N

N

2

1

VBUS_5V_IF

C480

C464

USB_DM

USB_DP

AP_DM

AP_DP

VBUS_5V_OVP VDD1V8

C463

R424

VBUS_5V_IF

9
0
4
L

1
2
3
4
5
6
7
8
9
10
11
12
13

R434
R435

R436

C466

C472

R437

ZD405

ZD404

C473

R432

USB_DM

USB_ID

JTAG_ID

2
8
4
C

1

0

0

0

4

4

D

D

Z

Z

USB_DP

3
0
4

2
0

D

4

Z
D
Z

C459

U403

C2

VBAT

BOOT

D2

JIG

VDDIO

E3

ID

F2

SDA

VBUS_OUT

F3

SCL

VBUS_OUT

B2 B3

INTB

VBUS

C1

U1

COMN1

U2

COMP2

A1

GND

DN1

1

NC

DP2

2

NC

B1

E2

A2

A3

C3D1

D3

E1

F1

JTAG_JIG_ON_N

JTAG_TXD

IF_TXD

IF_RXD

JTAG_RXD

JIG_ON_N

MUIC_INT

USB_ID

MUS_SDA

MUS_SCL

BOOT

TP_MUS_INT

TP_IF_TXD

TP_IF_RXD

V_BAT

C461

C460

C462

IF Connector

u-USB

MU IC

8-9

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8-3-4.

LCD Working

Abnormal LCD Working

LCD FPCB connector is

correctly connected?

Check the voltage

LCD_VDD_IO_1.8V

4)=1.8

Yes

V?

(C60

No

No

Connect correctly

Resolder or Change

C60

4

END

Yes

8-10

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8-11

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8-3-5.

TSP Working

Abnormal TSP Working

TSP FPCB connector is

correctly connected?

No

Connect correctly

Yes

Check the voltage

V_TSP

_3.0V(

C60

V?

Yes

END

7)=3.0

No

Resolder or Change

C60

7

8-12

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