Samsung L770 Troubleshooting 6
10. Flow Chart of Troubleshooting
10-1-1.
Power ON
Deduct power management component damage
Check VBAT
L400, L401
≒
Check VBAT
C429
C432
TP402
Check TCXO
R111
C436≒VRTC~2V
TP407≒VRTC~2V
1.35V
≒
1.8V
≒
3.6 ~ 4.1V
≒
2.9V
≒
3.4 ~ 4.2
Resoldering
each Component
Check VBAT
C429
C432
TP402
1.35V
≒
1.8V
≒
3.6 ~ 4.1V
≒
Check TCS101
PIN
3≒26
Check≒OSC301
C327
≒
MHz
32.768
Check
Initial Operation
VBAT
VIO_2.62V
kHz
TA400
C401
VBAT
C402
C403
C407
L400
L401
C405
C406
VSD2_1.8V
1
0
0
1
1
1
7
1
K
B
K
1
2
E
O
D
D
N
G
S
S
R
O
D
D
A
M
D
D
H
_
V
V
C
D
D
D
V
D
V
2
9
9
5
1
K
H
B
G
S
B
B
C
I
T
S
F
V
U
M
A
3
D
IM
U
1
S
D
D
F
V
D
D
R
V
D
D
V
D
V
1
9
1
1
1
1
F
H
B
G
E
C
D
2
E
X
B
A
F
IO
U
M
L
R
IO
IO
A
L
M
D
D
D
D
P
D
D
U
U
D
D
D
V
A
A
V
V
D
D
D
V
D
D
V
V
JIG_ON_PWR
WDOG
PWR_ON
RTC_OUT
PWR_OFF_DET
PM_INT
VRTC
R406
VRTC_2.0V
C436
R415
R408
1
2
R407
POS
NEG
M401
R405
J1
J2
H3
J3
K3
L3
K4
L4
L5
K5
J4
SU1_GATE
SU1_GND
SU1_FB
SU1_ISENSE
POWER_ON
WDOG
ON_OFF1
ON_OFF2
ON_OFF_OUT
I2C_INT
R322
R
3
3
2
C326
C323
C321
C313
C303
C
3
2
4
C
3
2
7
R
3
0
1
C
4
3
1
C430
C
L
4
2
4
9
0
2
L
4
0
0
C716
C410
C424
C
4
1
5
R
4
1
3
C427
R
4
3
4
C420
C
4
1
2
C416
C
4
1
4
C406
C411
C421
0
0
4
C435
Q
4
0
7
P
T
R417
C
R
3
2
4
R330
O
S
C
3
0
1
C428
4
1
3
C417
R416
R412
R435
C
R
4
3
3
6
0
2
C422
R
R
4
1
3
5
3
1
M401
T
P
3
3
0
1
0
4
U
N
_
2
P
E
E
C
L
C403
S
_
P
T
C401
C402
C
4
2
4
3
0
5
L401
C
TA400
4
1
9
R430
C439
D402
D
4
0
1
C
4
0
9
C438
R448
R425
R
4
0
6
R
4
0
8
T
P
4
0
3
H
E
D
C
5
4
8
2
X
5
X
U
1
C
2
4
0
7
R407
R
4
0
5
C
4
3
2
L403
R
7
1
0
1
0
7
R
U
7
1
2
R
3
1
1
2
D
2
6
1
A
T
R
-
F
C450
L703
C
4
3
3
C434
2
1
U
X
X
8
5
D
E
H
U
4
0
2
R726
U
7
R725
0
3
C717
C706
L
7
0
0
10-1
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Flow Chart of Troubleshooting
Power on dose not work
Using jig box, Power on works well
Check Current Consumption
Check PWR_ON(R408) signal
during pressign the end key
Battery connector contact is poor,
Be pressed battery connector contact
insert tweezers into bat connector and pull up
(
150mA?
≥
Re-download
Con_to_con FPCB connection,
Board/LCD(Reassemble)
<
10-2
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This Document can not be used without Samsung's authorization
Deduct Power management component damage
Flow Chart of Troubleshooting
VUMTS_2.8V C418
VRF_2.9V C413
VEDGE_1.5V C412
VRF3_BT_1.8V C420
VAFC C414
VSIM_2.9V C416 ≒ 2.9V
2.8V
≒
2.85V
≒
1.53V
≒
≒
≒2.65V
VAUDIOA_2.5V C422 ≒ 2.5V
Check operation
1.8
VAUDIOA
VAUDIOB
VUMTS
CH_SOURCE
CH_CNTRL
SENSE_IN1
SENSE_IN2
CHARGE_UC
Resoldering
Each component
Resoldering
Each component
Replace U401
VMME_2.9V
VAUX_2.9V
H2
VAUX
C11
VMME
A11
VIO
A10
VPLL
F2
G1
D11
VRF2
F10
VRF1
E10
VRF3
H11
VAFC
G10
VSIM
F11
VVIB
A4
VUSB
J11
VBAT
K8
L7
L9
K10
L8
C419
VIO_2.62V
C409
C427
C420
VPLL_1.35V
C410
C411
C424
VAUDIOA_2.5V
C421
VAUDIOB_2.5V
C422
C423
VEDGE_1.5V
VRF_2.9V
VRF3_BT_1.8V
C413
VSIM_2.9V
C426
C414
C417C412
C416
C418C415
10-3
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Flow Chart of Troubleshooting
10-1-2.
Check the speaker soldering part Resoldering
Audio part
Receiver sound is not heard
Check the SPK Amp
input/output signal
R516,R527/L503,L502
VAUDIOA_2.5, VAUDIO_2.5)
(
Check U302
OK Change the board
NO
Yes
Check U502(VBAT_AUDIO,
AUDIO_SEL, SPK_AMP_EN)
Change the amp
Change U302 and Re-download
Receiver sound from headset
Check the IF con soldered
Check the jack in(R606)
Check the E/P amp input/output
C552, C553/R641, R642
VAUDIOA_2.5, VAUDIOB_2.5)
(
condition
Hi
R516,R527/L503,L502
Check U302
Low
<->
OK Change the board
NO
Yes
Resoldering
Check the headset GND
Check U504(EARAMP2.5V, EARAMP_
EN)
Change U302
10-4
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FM_RADIO_ANT
IF_EARMIC_P
IF_EARMIC_N
IF_EAR_R
EAR_COM
IF_EAR_L
EAR_SWITCH
JACK_IN
SDS_TXD_JTAG
SDS_RXD_JTAG
JIG_ON_IF
USB_DP_VX
USB_DM_VX
VSD2_1.8V
R645
C608
R641
R642
6
1
5
O
I
ZD603
1
O
I
Flow Chart of Troubleshooting
TA_VEXT
USB_5V
VBAT
JIG_ON_IF_JTAG
SDS_RXD_JTAG_J
SDS_TXD_JTAG_J
IFC601
1
1
2
2
3
3
4
4
5
5
6
6
7
R604
R606
R608
R609
R611
R643
R644
4
5
3
4
IO
IO
D
2
N
IO
G
3
2
VR603
VR601 VR606
VR604
VR605
VR602
L601
ZD601
C601
C610
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
21
22
22
23
23
24
24
25
25
C
5
1
8
R507
R
R
3
R
5
0
1
C545
C
5
4
4
n
R
W
_
P
T
R
5
3
5
L
6
0
1
R
6
4
1
R
6
4
2
R606
R643 R644
3
2
7
C
3
1
7
C
3
1
6
V
R
6
0
4
VR603
R608
R609
R
6
1
1
Z
D
6
0
1
2
6
C310
R604
C307
C
3
0
0
R
3
1
4
V
R
6
0
1
R711
C
6
0
8
R645
VR602
3
0
6
D
Z
C
3
0
5
R530
C515
C
C
5
5
0
0
8
2
C517
C
V
5
0
R
VR606
7
6
0
5
I
F
C
6
0
1
C601
10-5
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Flow Chart of Troubleshooting
10-1-3
Microphone Part
1.
Check the condition of the mic connector
After assembling, checkasound
Check the voltage level of mic bias
After check existence of another part, Check PMIC
2.
Check soldering of the IF connector
After resoldering, checkasound
Check the voltage level of ear-mic bais
After check existence of another part, Check PMIC
10-6
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