
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 83 -
4.6.3 Checking RF Rx Level
TP1
TP2
TP4
TP3
U100
FL10
U101
U100
56p
C100
GND1
3
GND2
4
5
GND3
6
GND4
IN
1
2
OUT
SW100
MM8430-2600RB3
100nH
L102
GSM1900_RX2
GSM900_RX1
5
6
GSM900_RX2
16
GSM900_TX
VDD
19
WCDMA2100
9
18
CTRL2
22
7
GND1
GND10
23
GND2
8
GND3
10
GND4
12
GND5
13
15
GND6
17
GND7
GND8
20
GND9
21
14
GSM18001900_TX
GSM1800_RX1
1
GSM1800_RX2
2
GSM1900_RX1
3
4
D5011
ANT
11
CTRL1
C123
15p
NA
C122
47p
C111
VREG_RF_SMPS
WCDMA
20dB
7dB
U103
CP0402A1950DNTR
50OHM
4
3
COUP
2
IN
1
OUT
2
45
31
KRX102U
TR100
2.7nH
L114
L115
5.6nH
130
R121
NA
L118
C164
3.3nH
FL102
ACMD-7602
ANT
3
PGND
4
1
RX
TX
2
NA
C160
2
G1
3
G2
5
G3
1
IN
4
O1
FL101
EFCH1950TDF1
10p
C168
100p
C167
3.3p
C162
R119
51
L122
1.8nH
0.01u
C158
L116
2.2p
1u
C435
33p
C155
47
R120
0.01u
C159
C156
4.7u
R122
130
L123
2.7nH
C165
10nH
3
GND2
6
7
GND3
9
GND4
RFIN
2
RFOUT
8
1
VCC1
VCC2
10
4
VCONT
5
VREF
WS2512_TR1G
U104
11
BGND
GND1
+VPWR
+VPWR
PA_R0
PA_ON
VREG_TCXO_2.85V
PWR_DET
TP3
TP3
TP4
TP1
U103
U104
TR100
FL101
U100
TP2
Summary of Contents for U370
Page 1: ...Date January 2008 Issue 1 0 Service Manual Model U370 Service Manual U370 ...
Page 178: ...Note ...
Page 179: ...Note ...