Samsung GT-S5150 Troubleshooting

9. Flow C hart of Troubleshooting

9-1.

9-1-1.

BASEBAND

Power On

Power On'does not work

'

Check the Voltage of Battery

more than

Check the current consumption

more than

Voltage of TA500=VBAT

Check the VCCD_1.8V,

VCCD_2.9V and

VCCD_1.2V_A of UCD200

Yes

No

Yes

Yes

3.3V

100

mA

Yes

No

No

?

No

Change the Battery

Download again

Check the related circuit

Check the related circuit

Yes

Check VRF_2.9V of RFT100

Yes

Check CLK26M_DBB on C117

Freq

Check the initial operation

=26

END

MHz

Yes

Yes

No

Check the UCD300 and C312, C313,

C103, C104, C105, C107

No

Check OSC100 and RFT100

9-1

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Flow Chart of Troubleshooting

9-2

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Flow Chart of Troubleshooting

9-3

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Flow Chart of Troubleshooting

9-4

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Flow Chart of Troubleshooting

9-5

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Flow Chart of Troubleshooting

VRF_2.9V

C116

RTX_I_P

RTX_I_N
RTX_Q_P
RTX_Q_N

C115

GSM850_LNA_IN_P

GSM900_LNA_IN_P

DCS_LNA_IN_P

PCS_LNA_IN_P
GSM850_LNA_IN_N
GSM900_LNA_IN_N

DCS_LNA_IN_N

PCS_LNA_IN_N

VCCD_2.9V

L101

C106

A1
B2
B1
C2

E5
F5
G5

E2
E3
E4

A7
B7
E7
F7
A6
C7
D7
G7

1
C

IG
D

A

D
D

AX

V

B
BX

FE1
FE2
FE3

FSYS2
FSYS3
FSYSEN

RX1
RX2
RX3
RX4
RX1X
RX2X
RX3X
RX4X

D
N
G

6
B

4

6

3
F

D

G

2

L
L

S

P

M

D

D

D

D

V

V

RFT100

D

D

N

N

G

G

4

4

1

C

D

D

VRF_2.9V

5

1

5

3

F

C

A

B

X

X
R
D
D
V

D
N
G

O

G

T

C

E

D

V

R

D

D

X

V

D

R

V

T
D
D
V

XOMODE

CTRLCLK

CTRLDA
CTRLEN

SYSCLK

SYSCLKEN

REFR

REGC

VBIAS

D

D

D

N

N

N

G

G

G

5

6

2

6

F

F

E

D

O
X
D
D
V

TX1
TX2

XT
XO

NC
NC

D
N
G

A3
A2

G1
G2
F4

D2
D3
C3

E1
G3
A4
C6
G6

1
2

C107

C117

TP_SBDT

C120

C103

GSM_PAM_IN
DPCS_PAM_IN

SBCK

SBDT26MHZ_BT
SBLE

R108

C104

OSC100

2

CLK26M_DBB

VRF_2.9V

C105

1

43

9-6

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Flow Chart of Troubleshooting

9-1-2.

Initial

Initial Failure

Yes

RST

check the R222)

(

="H

END

igh

Yes

"?

No

Check the circuit related to reset

9-7

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Flow Chart of Troubleshooting

9-8

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Flow Chart of Troubleshooting

R222

R223

NTSRTTSR

9-9

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Flow Chart of Troubleshooting

9-10

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Flow Chart of Troubleshooting

9-1-3.

Charging Part

Abnormal charging part

Check the Voltage Of L300.

Check the U300 pin

under

under

5.0V?

0.4

Yes

Yes

V?

Yes

No

4.

No

Check the circuit related to

VUSB_OUT_5V

Check the circuit related

Check the R306

R303

&

=4.3

Replace U300

END

=16

Kohm?

Yes

Kohm?

No

Replace R306, R303

9-11

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Flow Chart of Troubleshooting

9-12

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Flow Chart of Troubleshooting

9-13

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