LG KS20 - Page 92

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Only for training and service purposes
4. TROUBLE SHOOTING
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4.6.3 Checking RF Rx Level
ANT500
L500
3.9nH
4.7p
C502
ANT501
0
R500
KMS-506
ENWY0002301
ANT
G1
G2
RF
SW500
NA
C506
C505
1.5p
(1608)
WCDMA
WCDMA LNA Circuit
SMPY0015501
As close as possible
20dB
C565
100p
1nH
L520
3p
C554
33p
C561
C560
33p
0.5p
C546
FL503
3
ANT
4
PGNDRX
1
2
TX
SDMY0001301
ACMD-7602
NA
C564
100p
C557
C566
100p
L516
1nH
C543
22p
L523
10nH
220p
C556
2.7nH
L521
VDD_RX
91
C553
33p
R520
VPWR
33p
C558
R521
91
33p
C549
C563
51
1.5p
R518
VMODE0
3
VMODE1
L518
3.3nH
U503ACPM-7381
6
GND1
GND2
7
GND3
9
PGND
11
RFIN
2
8
RFOUT
VCC1
110
VCC2
VEN
5
4
EFCH2140TDE1
G1
2
G2
5
IN
1
O1
3
O2
4
FL502
0.75p
10u
C550
C555
75
R519
L515
2.7nH
33p
C547
0.5p
C545
U502
SCDY0003402
50OHM
4 3
COUP IN
2
OUT
1
PWR_DET
RX_WCDMA_2100
WCDMA_PA_
O
WCDMA_PA_
R
WLNA_OUT
TP1
TP2
TP3
Vbias
TP4