Checking Umts Block - LG KF700 Service Manual

4. TROUBLE SHOOTING

4.16 Checking UMTS Block

4.16.1 Checking TX level
TP1
SW101
FL100
KMS-507
DGM112M02
C100
1
G2
ANT RF ANT
G1
100p
2
GND1
3
GND2
8
GND3
10
GND4
20
GND5
22
GND6 GSM850_RX1
23
GND7 GSM850_RX2
24
GND8
WCDMA_2100
PCN_PCS_TX
GSM850_EGSM_TX
C111 C114
10n
10n
TP2
L113
C150
NA
100p
L116
FL103
6.8nH
SAYZY1G95EA0B00
C170
22p
U104
SCDY0003801
C172 L120
1.8nH
56p
C173
L121
DNI
1.8nH
R117
47
LGE Internal Use Only
12
PCN_RX1
13
PCN_RX2
14
PCS_RX1
15
PCS_RX2
16
EGSM_RX1
17
EGSM_RX2
18
19
21
9
11
+VPWR
C160
C162
4.7u
0.01u
smd_1608h_9_r
11
10
9
C171
8
7
2.2p
6
1 2
L122
C174
4.7nH
DNI
20dB
R116
PWR_DET
TP3
47
R118 R119
8 dB
120 100ohm
[Fig. 4.15] Schematic of the WCDMA Tx Block
L118
1nH
C163 C164
0.01u 4.7u C165
DNI
smd_1608h_9_r
U105
AWT6279R
PGND
1
VCC VBATT
2
GND3 RFIN
3
RFOUT VMODE2
4
GND2 VMODE1 PA_R1
5
GND1 VEN PA_ON
C175 C176
0.01u 100p
Copyright © 2008 LG Electronics. Inc. All right reserved.
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TP4
FL104
EFCH1950TDF1
4 5
C161 56p
O1 G3
1
WCDMA_2100_TX_OUT
C539
IN
G2 G1
1p
3 2
L119
3.9nH
Only for training and service purposes