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Checking Ant. Sw Module; Checking Rf Tx Level - LG U880 Service Manual
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Contents
Table of Contents
Troubleshooting
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4. TROUBLE SHOOTING
4.6.2 Checking Ant. SW Module
4.6.3 Checking RF Tx level
L1035
4.7nH
VREG_RFRX_0_2.85V
ANT_SEL0
ANT_SEL1
ANT_SEL2
TP2
GSM/DCS/PCS
Refer to chapter 3.4
Test Point (RF Tx Level)
TP1
ANT1000
ANT1001
SW1002
C1230
G2
ANT
RF
G1
15p
KMS-512
C1112
L1034
0.5p
15nH
L1031
7.5nH
FXL4T245BQX
U1008
1
VCCA
_OE
14
VCCB
C1108
T__R
7
0.1u
GND1
8
GND2
15
BGND
13
B0
A0
12
B1
A1
11
B2
A2
10
B3
A3
Schematic of RF Tx Level
C1111
33p
M054E
U1006
9
2
12
CTRL1
RX_DCS1
4
13
CTRL2
RX_DCS2
6
11
14
CTRL3
RX_PCS1
20
15
CTRL4
RX_PCS2
16
RX_EGSM1
17
RX_EGSM2
2
8
3
UMTS
TX_DCSPCS
3
1
TX_EGSM
4
5
R1050
R1049
0
0
C1100
C1104
0.01u
68u
L1026
L1025
NA
NA
C1102
68p
15
DCS_PCS_OUT
DCS_PCS_IN
11
U1005
GSM_OUT
GSM_IN
SKY77328
ENABLE
19
RSVD_GND
- 90 -
TP1
TP2
TP3
ANT_SEL2
ANT_SEL1
ANT_SEL0
GSM 900 TX
LOW
LOW
HIGH
GSM 900 RX/WCDMA
LOW
LOW
LOW
DCS1800/PCS1900 TX
HIGH
HIGH
LOW
DCS 1800 RX
LOW
HIGH
LOW
PCS 1900 RX
HIGH
LOW
LOW
TP3
+VPWR
C1098
C1070
10u
0.01u
3
4
18
100
R1041
GSM_PA_EN
1
BS
GSM_PA_BAND
R1044 100
C1103
C1101
15p
15p
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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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