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U880
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Checking Vcxo Block; Checking Ant. Sw Module; Checking Rf Tx Level - LG U880 Service Manual
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:
User manual
(132 pages)
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,
Brochure
(8 pages)
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Contents
Table of Contents
Troubleshooting
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4. TROUBLE SHOOTING
4.5.1 Checking VCXO Block
4.5.2 Checking Ant. SW module
4.5.3 Checking RF TX Level
WCDMA
TP2
C1001
27p
Refer to 4.3
Refer to 4.4
TP4
Test Point (RF TX Level)
TP1
ANT1001
SW1002
C1230
G2
ANT
RF
G1
15p
KMS-512
C1112
L1035
L1034
0.5p
4.7nH
15nH
L1031
7.5nH
VREG_RFRX_0_2.85V
C1108
0.1u
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP3
SKY77410
U1002
12p
C1113
RF_OUT
RF_IN
11
5.6nH
C1114
L1002
NA
270
R1011
TX_AGC_ADJ
C1028
0.01u
+VPWR
C1037
0.01u
C1032
0.01u
HDET
U1001 LMV225TLX
1.8K
C1031
100p
A1
A2
RFIN_EN
VDD
R1013
B1
B2
GND
OUT
R1012
PA_ON
C1030
G1
10K
1200p
G2
ANT
G3
G4
G5
G6
G7
ILNA_OUT
TP3
TP2
ANT1000
C1111
33p
M054E
FXL4T245BQX
U1008
1
9
2
VCCA
_OE
CTRL1
RX_DCS1
14
4
VCCB
CTRL2
RX_DCS2
6
11
T__R
CTRL3
RX_PCS1
7
20
GND1
CTRL4
RX_PCS2
8
GND2
RX_EGSM1
15
BGND
RX_EGSM2
13
2
8
B0
A0
UMTS
TX_DCSPCS
12
3
B1
A1
TX_EGSM
11
4
B2
A2
10
5
B3
A3
TP4
C1215
R1015
3
12p
0
C1034
NA
VREG_W_PA
C1026
10u
TR1000
UMC4N
PA_ON
VREG_RFTX_2.85V
VREG_RFTX_2.85V
HDET1
C1007
27p
13
49
PLNA_OUT
PGND
14
48
ILNA_OUT
GLNA_BIAS
15
47
GLNA_IN
PLNA_BIAS
16
- 82 -
TP1
U1006
12
13
14
15
16
17
3
1
FL1002
EFCH1950TDC1
3
5.6p
C1082
G3
R1031
4
1
OUT
IN
G2
G1
0
5
2
L1013
8.2nH
IMT_RX_P
IMT_RX_M
VREG_TCXO_RFR
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Table of Contents
Troubleshooting
TROUBLE SHOOTING
73
Audio Trouble Shooting
109
Charger Trouble Shooting
119
Troubleshooting Download Errors
135
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