Only For Training And Service Purposes - LG GB220 Service Manual

4. TROUBLE SHOOTING
(2) Checking Mobile SW &FEM
TP1
R402 110
VLOGIC
R403 1K
TX_RAMP
R405 110
TX_EN
R406 110
BS1
R408 110
BS2
C408 C409 C410
1000p 1000p 1000p
m KMS512 080812 Jeno
R414
1
C425
DNI
LGE Internal Use Only
LGE Internal Use Only
BS1
BS2
TP2 TP3
Figure 4.2.4
C411 C412
39p 1000p
33
PGND3
32
PGND2
31
PGND1
10 1
U400
GND5 GND1
11 SKY77531 30
RX1 VBATT
12 SMRH0005201 29
RX2 DCS_PCS_IN
13 28
RX3 GND17
14 27
RX4 GSM_IN
15 26
GND6 GND16
16 25
GND7 GND15
36
PGND6
35
PGND5
34
PGND4
RX_BAND SWAPPED
C_GND2 C_GND4
3 10
C_GND1 C_GND3
2 5
INPUT2 GND1
4 6
GND2
7
OUTPUT1
8
INPUT1 OUTPUT2
1 9
FL401 B9509
SFSB0002301
RX_BAND SWAPPED
C_GND2 C_GND4
3 10
C_GND1 C_GND3
2 5
INPUT2 GND1
4 6
GND2
7
OUTPUT1
8
INPUT1 OUTPUT2
1 9
FL402 B9508
SFSB0002302
TX EN TX Ramp
VLOGIC
EGSM Rx
VLOGIC
Tx_EN
BS1
BS2
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 68 - Copyright © 2009 LG Electronics. Inc. All right reserved.
TP4
Only for training and service purposes