LG GW620 - Product care and maintenance

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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Schematic of the Antenna Switch Block
ANTENNA_PAD
180ohms
R54
10uF
C278
C318
1n
1n
C316
39p
C326
R13 2.2K
100ohms
R63
VBATT
R53
180ohms
1nC317
C315 1n
U20
SKY77521
1
3
2
3
3
3
4
3
30 5
29 4
28
27 20
26 19
25 18
24
23 16
22 15
21 14
12 13
11
210
39
1
8
6
717
ANT
BS1
BS2
_TXEN
HB_RF_IN
MODELB_RF_IN
RSVDGND1
GND2
RX4GND3
RX3GND4
RX2GND5
RX1GND6
GND7
WCDMA1GND8
WCDMA2GND9
WCDMA3GND10
GND11
VAPCGND12
VBATTGND13
4
D
N
GP
3
DNGP
2D
N
GP
1
DNGP
R135
30ohms
R138
62ohms
47pF
C335
R64
100ohms
ANT_SEL2
ANT_SEL3
ANT_SEL1
ANT_SEL0
PMA
R
_AP_MSG
WCDMA_900_RTX
GSM_TX
WCDMA_2100_RTX
DCS_PCS_TX
WCDMA_1900_RTX
(1608)
5dB
9dB
2mm
TP1