Checking Umts Block; Only For Training And Service Purposes - LG KS20 Operating Instructions Manual

4.6 Checking UMTS Block

4.6.1 Checking Tx level
MA
C545
0.5p
FL503
C553
1 4
RX PGND
2 3
33p TX ANT
ACMD-7602
C554
SDMY0001301
3p
TP3
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

ANT500 ANT501
R500
0
L500
3.9nH
C505
1.5p
L515
2.7nH
C549
TP2
33p
VPWR
U502
C560
SCDY0003402
33p
C563
1.5p
20dB
R518
51
R520
91
For testing, Max power of UMT 2100 is needed.
4. TROUBLE SHOOTING
SW500
KMS-506
C502
G2
ANT RF
G1
4.7p
C506
ENWY0002301
NA
VDD_RX
C543
L516
22p
1nH
WLNA_OUT
SMPY0015501
C555 C556 C557
10u
220p 100p
ACPM-7381
(1608)
11
PGND
10
VCC2
9
33p GND3
8
RFOUT VMODE1
7
C561 GND2 VMODE0
6
C564 GND1
NA
As close as possible
R519
PWR_DET
75
R521
91
10dB
- 91 -
TP1
WCDMA LNA Circuit
FL502
EFCH2140TDE1
5 4
C547 L518
G2 O2
1
IN
G1 O1
3.3nH
33p
2 3
C550
0.75p
TP4
U503
1
VCC1 C558 L521
2
RFIN
3
2.7nH
33p
4
5
VEN
10nH
C565 L523
C566 100p
100p
LGE Internal Use Only
L517
1nH
C546
0.5p
L519
1nH
4
O1 G
G2 G
3
FL5
EFCH
WCDMA_PA_R0
WCDMA_PA_ON