Checking Umts Block - LG U370 Service Manual

4. TROUBLE SHOOTING

4.6 Checking UMTS Block

4.6.1 Checking Tx level
TP3
TP4
WCDMA
TP2
2.7nH
L114
FL102
4 1
PGND RX
3 2
ANT TX
ACMD-7602
L118
NA
LGE Internal Use Only
U104
FL101
ANT102
L100
3.3nH
1.2p
L101
C101
NA
+VPWR
C162
3.3p
L116
2.2p
C164
3.3nH
20dB
U103
CP0402A1950DNTR
PWR_DET
R120
R121 R122
47
130 130
7dB
For testing, Max power of UMT 2100 is needed.
- 80 -
U100
FL102
U101
TP1
MM8430-2600RB3
C100
56p
SW100
L102
100nH
U100
TP3
C156 C158
4.7u
0.01u
WS2512_TR1G U104
10 1
VCC2 VCC1
9 2
GND4 RFIN
8 3
RFOUT GND1
7 4
GND3 VCONT
6
C165
GND2
11 5
10nH
BGND VREF
Copyright © 2007 LG Electronics. Inc. All right reserved.
TP1
TP2
TP4
C155
33p
+VPWR
C159
L115
0.01u C160
5.6nH
NA
PA_R0
TR100
KRX102U
PA_ON
VREG_TCXO_2.85
C167 C435
100p 1u
Only for training and service purposes