LG -A290 Service Manual page 67

(2) Checking Mobile SW &Tx module
VLOGIC
C400
DNI
RF_ANT_SW1
TP7
C402
GND400 ANT400
R407
10K
RF_TX_RAMP
PA_EN
TP5
R409 C407
C406
24K 220p
DNI
TP4
TP2
C405
100p
SW400
C411 C412 L400
2
ANT COMMON
1
2.4n
100p
G3 G4 100p
C413
3 4
L411
C415
DNI 27n C416
0.5p
DNI
LGE Internal Use Only
U400
SW400
TP4
TP6
DNI
TP3
GND8
15
VRAMP GND6
16 8 VBAT
GND5
7
TxEN GND4
17 6
GND3
U400
5
RSVD
18
VBATT2
4
Rx1 VBATT1
19 3
RSVD3 GND2 C410 C408 C409
20 2
GND1 1u
1 10u
56p
Rx2
21
GND7
22
(10V,2125) (50V,C,NPO) (50V,C,NP0)
C417 18p
GSM850_RxP
L401
B9512
FL400
22n
1 IN 9
O1_1
C418 18p
GSM850_RxN
8 C419 18p
O1_2
EGSM_RxP
7
O2_1
L402
9.1n GND O2_2 L403
4 6
22n
2 3 5 10
C420 18p
EGSM_RxN
C421 5.6p
DCS_RxN
B9513
FL401
L404
1 IN 9
O1_1 4.7n
C422 5.6p
8
O1_2
DCS_RxP
7
O2_1
PCS_RxN
C423 6.8p
L405 G1 O2_2
4 6
L406
4.3n
5.6n
2 3 5 10
C424 6.8p
PCS_RxP
Figure 4.2.2
R402 C401 33p
HB_TX
51
C403 33p
LB_TX
VLO
GIC
TX_E
N
BS
Vram
p
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4. TROUBLE SHOOTING
TP2
TP5
TP7
TP4
TP6
TP3
TP1
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