Mobile Switch - LG KM500 Service Manual

4.2.1.3 Mobile Switch & PAM & FEM Circuit
C424
22p
C425
56p
C427
15p
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Mobile Switch

SW400 between C418 and
L404 Is short?
YES
FEM
Check Control Signal
C425,C427
YES
Check U402
FL400
ESHS-C080SR
GND5 GSM18001900_TX
16 11
GND4 GSM900_TX
15 13
GND3
14
GND2 GSM1900_RX2
9 6
GND1 GSM1900_RX1
7 5
GSM1800_RX2
4
GSM1800_RX1
3
VC2 GSM900_RX2
10 2
VC1 GSM900_RX1
12 1
TP4_RF
TP5_RF
NO
Replace SW400
NO
Check U403,U404
- 49 -
4. Trouble Shooting
C414
1000p
1
3 IN 4
GND1 GND2
SW400
5 GND3 6
GND4
OUT
2
MM8430-2600RB3
100nH
L404
LGE Internal Use Only