LG GD580 - 4 Trouble Shooting; Power on Trouble

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. Trouble Shooting
4. Trouble Shooting
4. TROUBLE SHOOTING
4.1 Power ON Trouble
START
No
Change main board
change
main battery
Yes
Yes
No
No
The voltage of mainbattery
is higher than 3.3V ?
END key operates well?
UART_TX(TP1) level is 1.8V
when END key pressed.
Follow the
keypad Trouble
shooting guide
Check
the voltage.
VRADA_2V8 (TP2) 2.8V
VDDD_1V5 (TP3) 1.5V
VDDE_1V8 (TP4) 1.8V
VDDC_2V65(TP5) 2.65V
VDDH_2V75(TP6) 2.75V
VDDF_2V5 (TP7) 2.5V
VDDG_2V85 (TP8) 2.85V
VDDK_2V75(TP9) 2.75V
VCORE(TP10) 1.2V
TP1
TP3
TP4
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP1
0
< Main Board – Bottom side >
TP2
n0
0
1
1
06C
NO
106TU
21
11
0
1
9
8
7
6
5
4
3
2
1
DNG
X
R
X
T
1CN
WS_N
O
TAB
V
2CN
3
CN
4CN
R
SD
STR
STC
DN
G
X
R
XT
R
A
HCV
WS_NO
T
AB
V
RWP
DXRU
DXTU
G3
G
5
.
2
TA
B
VHSALFPPVDNGYARR
A
TABV
TU
R
U
074
8
26R
074
9
26R
K1
0
36
R
HSALFPPV
N_B
W
S
N
O
X
T_TRA
U
_C
CA
_
P
PA
XR_TR
AU
_
C
CA_PP
A
N
I
CD
TRAU
TNIOP PT YAR
R
A
B
S
U
0
604R
0
704R
60
4
C
u
1
57V
2
_KDD
V
804R
0
0
9
0
4
R
RB521S-30
D401
n001
704C
C_T
AB
V
u
7
.
4
10
4L
5
7
V2
_H
D
D
V
104TAB
u01
904C
8V2_
A
D
AR
V
01
4
C
u1
2
14C
u
2
.
2
8V1
_
DAR
G
I
D
V
4
14
C
u
1
u
0
1
5
14C
u
1
6
14C
u1
7
14
C
EROCV
T
A
B
V
58V
2
_
GD
DV
9
1
4
C
u1u1
02
4C
91
4R
0
8V1_E
D
DV
104
BF
BLM18PG121SN1J120
0
324R
5
V
1_DD
DV
5
V
2_F
D
DV
K7.4
924R
4
3
4
R
0
u
1
634C
TA
BV
1B
1A
2A
2
B
1
1J
2
1
M
7A
9
A
2
1B
11
A
21
D
2
1
F
1
1B
21C
A
_
D
DV
O
D
LTX
E
D_D
D
V
E_D
DV
C
_DDV
H
_
D
DV
F_D
DV
G
_
DDV
K_DDV
PL
DDV
K
C
U
BV
KC
U
B
D
DV
KCUBWS
KCUBSSV
5
6V2
_
C
D
DV
0
8
34
R
8
V
1_E
D
DV
T
A
B
V
8
V
1_DARG
I
D
V
8
V2_AD
A
RV
5
7
V
2
_
K
DD
V
5V2
_F
DDV
5
7V
2
_
H
DD
V
5
8V2_GDDV
5
6
V
2_
C
D
DV
5V1
_
DD
DV
PUK
C
A
B
V
EROCV
BF_KCUBV
ER
O
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1
en
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P d
nu
or
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co
L
J1NS121GP81MLB
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10