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4. TROUBLE SHOOTING
(2) Checking Mobile SW & TX Module
TEST POINT
CIRCUIT
TP4 TP5 TP6 TP7
TP4
TP5
R319
10K
APC
R302
1K
PA_EN
BAND_SW1
BAND_SW2
R301
C327
C334
C333
18K
6p
6p
22p
33
32
31
10
11
PCS
DCS
12
EGSM
13
GSM850
14
15
16
36
35
34
LGE Internal Use Only
TP7(BS2)
TP6(BS1)
VRF
TP6
TP8
TP7
TP8
VBAT
C336
C332
220p
22p
PGND3
PGND2
PGND1
1
GND5
GND1
30
RX1
VBATT
29
RX2
U303
DCS_PCS_IN
28
RX3
GND17
SKY77547
27
RX4
GSM_IN
26
GND6
GND16
25
C316
GND7
GND15
DNI
PGND6
PGND5
PGND4
4. TROUBLE SHOOTING
TP5(PA_EN)
TP4(APC)
TP8(VRF)
TP2(High)
TP3(Low)
Figure 4.3.4
CONTROL LOGIC
EGSM Tx
VRF
PA_EN
BS1
C324
C326
C329
BS2
33p
DNI
10u
SIM1
C345
33p
DCS_PCS_OUT
C346
33p
GSM_OUT
VRF
C325
DNI
PA_EN
BS1
BS2
SIM2
- 62 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
TP11
TP9(VBAT)
TP1
Only for training and service purposes
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