4. TROUBLE SHOOTING
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Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
R720
100p
DNI
R718
R719
1
0
R721
R722
DNI
C642
3.3p
C628
1u
1u
C629
1u
C638
C646
100n
1u
C644
L701
27n
FB602
120
U600
L12
N12
M11
N11
M10
H11
H12
D8
H8
J11
J12
L13
M13
N13
N10
N9
L10
L11
J13
H13
F13
G13
L5
L7
H3
J7
J6
H6
M3
B12
A11
C11
A12
C12
C13
G7
G8
G9
F9
F4
A13
B13
E12
H10
E13
D13
B11
E8
A8
B8
B5
B9
A9
B7
B6
K9
F7
G10
G2
D7
D6
C7
C6
D9
M9
J3
H2
J2
L9
J9
E1
C2
A1
G1
C4
E4
E6
E7
K7
F5
E3
C5
E5
D4
E2
G3
B1
B3
C3
H4
K8
M8
N8
H5
M7
J8
G4
L8
G5
A4
A5
A3
C1
D1
RX_5G_IN TX5G_OU
T
TX2G_OU
T
RX2G_IP RX2G_IN EED
I
EESK EEC
S
CLK_DC SD1_DAT1 SD1_DAT2 SD1_DAT3 SD1_CM
D
SD1_CLK SD1_DAT0 AVSS33_BA AVSS33_PA_
1
AVSS33_PA_
2
AVSS13_WIFISX_
1
AVSS33_WIFISX_
2
AVSS13_BB AVSS13_PLL_
1
AVSS13_PLL_
2
AVSS13_TRX2G5
G
GND1 GND2 AVDD13_PLL_
1
AVDD13_PLL_
2
AVDD13_BB AVDD13_TRX5
G
AVDD13_WIFISX_
1
AVDD33_PA AVDD33_BA AVDD33_WIFISX_
2
DVDDIO_SDIO1 ANTSEL_
4
ANTSEL_
3
ANTSEL_
2
ANTSEL_
1
ANTSEL_
0
WLAN_AC
T
AVSS13_BTSXAFE_
1
AVSS13_BTSXAFE_
2
AVSS13_BTSXAFE_
3
AVSS13_BTSXAFE_
4
NC3
SD2_CMD
SD2_CLK
SD2_DAT0
DVDDIO_SD2
AVDD33_BTTX
AVDD13_BTRX
AVDD13_BTAFE
AVSS13_BTAFE_1
AVSS13_BTSXAFE
AVSS13_BTSX_1
AVSS13_BTSX_2
GND3
NC1
OSC1_GPS
SYNC
ECLOCK
DUTY_LOSS
RF_INN_GPS
RF_INP_GPS
GPIO1_25
GPIO1_24
GPIO1_26
GPIO1_27
GPIO1_28
AVDD28_OSC
AVDD13_SXIF_GPS
AVDD13_LNA_GPS
AVSS28_OSC
AVSS13_RX_GPS
AVSS13_SXIF_GPS
FSOURCE
XTEST
GPIO1_10
GPIO1_11
GPIO1_9
GPIO1_13
GPIO1_12
GPIO1_14
RTCCLK_O
RTCCLK
VRTC
AVSSRTC
FM_AUIN_R
FM_AUIN_L
FM_AUOUT_R
FM_AUOUT_L
FM_TX_OUT
FM_RX_IN_N
FM_RX_IN_P
I2S_DATA_IN
I2S_DATA_OUT
I2C_SDA
I2C_SCL
I2S_CLK
I2S_WS
NC2
FM_VDD28
FM_VDD13
FM_VSS2
FM_VSS1
TP609
TP61
0
TP61
1
TP61
2
FB601
120
C637
0.1u
C636
0.1u
C643
10p
C640
10p
100n
C641
C634
100n
10p
C624
100n
C625
C632
10p
C626
100n
100n
C635
+1V8_VIO_MTK
.
SD1_DAT3
SD1_DAT2
SD1_DAT1
RTCCLK
GPS_SYNC
FM_AUOUT_R
FM_AUOUT_L
+2V8_VIO_MTK
+2V8_VIO_MT
K
I2S_CLK
I2S_DATA_IN
I2S_WS
+2V8_VRTC_MTK
WIFI_TX
ANTSEL_
0
BT_AVDD13
FM_AVDD28
FM_AVDD13
WF_PA_VC
C
GPS_AVDD13
BT_AVDD33
+2V8_TCXO_LDO
RF_INP_GPS
WIFI_RX_BT_TR
X
OSC1_GPS
WIFI_AVDD13
ANTSEL_
1
SD1_DAT0
SD1_CM
D
SD1_CLK
FM_ANT
RTCCLK_GPS
FM_RX_IN_N
Close to MT6575
Close to Pin A9
Close to MT6620
Close to MT6620
differential trace to connect to audio jack
Keep ther FM_RX_IN_N and FM_ANT in
3. Make star connection for AVDD13 (Both E6,E7 and E4,C4,G1)
1
2
4
3