LG GD330 - FM-Radio Trouble Shooting

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Only for training and service purposes
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4. TROUBLE SHOOTING
4.16. FM-Radio Trouble Shooting
FM IC is problem.
Replace the U303
YES
YES
Replace the C310,L304(Main)
NO
Check the soldering status Of TP1,
TP2 (Main) O.K?
Check the signal of C228,C229
Can you see a signal?
START
YES
Go to the speaker/ EAR_MIC
Trouble shooting
NO
Check 32.768kHz signal
at CLK400,C322
Can you see a signal?
Check the VIO Voltage(1.8V)
, the VEXTH Voltage(2.8V)
O.K?
NO
Go to the Power Trouble
shooting
The CLK Buffer is
problem.
Replace the U304
YES
NO
U303
TP1
U304
TP2
H
T
X
E
V
_
8
V
2
u1
.0
9
2
3
C
10
T
SR_
5
_SEN
6
2
D
N
G
51
3
D
N
G
19
GPIO1
18
GPIO2
17
GPIO3
T
U
O
L
4
1
1
1C
N
NC2
20 21
PGND
RCLK
9
D
N
G
F
R
3
TU
O
R
31
7
SCLK SDIO
8
VA
16
DV
1
1
VIO
M
G
-
91
C
-
2
0
74
I
S
30
3
U
P
I
M
F
2
1D
N
G
2
1
4
L
T
X
E
V
_
8V
1
100KR331
OI
V
_8
V
1
2
2
3
C
p0
0
1
40
3
U
2
D
NG
C
C
V
4
2
T
F
D4
1
Z
S
7
1
L
N
u1.0
133C
K
01
R332 100K
93
3
R
7
03
B
F
233C
p72
0
33C
u
2.
2
FM_INT
L_M
F
T
S
R
_
M
F
_
K
23
_
K
L
C
T
N
A
_M
F
I2C_SDA
I2C_SCL
R_M
F