LG KS20 Operating Instructions Manual page 92

4. TROUBLE SHOOTING
4.6.3 Checking RF Rx Level
WCDMA
TP3
L520 C553
RX_WCDMA_2100
1nH
33p
C554
3p
LGE Internal Use Only
ANT500 ANT501
R500
0
L500
3.9nH
C505
1.5p
L515
2.7nH
TP2
C545
C549
0.5p
33p
FL503
1 4
RX PGND
2 3
TX ANT
ACMD-7602
SDMY0001301
U502
C560
SCDY0003402
33p
20dB
R518
51
SW500
KMS-506
C502
G2
ANT RF
G1
4.7p
C506
ENWY0002301
NA
VDD_RX
C543
22p
WLNA_OUT
TP4
VPWR
C555 C556 C557
10u
220p 100p
(1608)
33p
C561
C563 C564
1.5p
NA
R519
PWR_DET
75
R520 R521
91 91
Copyright © 2007 LG Electronics. Inc. All right reserved.
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TP1
Vbias
WCDMA LNA Circuit
L516
FL502
1nH
EFCH2140TDE1
5 4
C547 L518
G2 O2
1
IN
3.3nH G1 O1
33p
2 3
C550
0.75p
SMPY0015501
ACPM-7381 U503
11
PGND
10 1
C558
VCC2 VCC1
9 2
GND3 RFIN
8 3
RFOUT VMODE1 33p
7 4
GND2 VMODE0
6 5
GND1 VEN
C565
C566 100p
100p
As close as possible
Only for training and service purposes
C546
0.5p
L521
2.7nH
10nH
L523
WCDMA_PA_R
WCDMA_PA_O