LG HB620 Service Manual

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4. TROUBLE SHOOTING
4.15 Checking UMTS Block
4.15.1 Checking TX level
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
WCDMA
20dB
8 dB
+VPWR
33p
51
C112
R119
C159
33p
33pC103
L125 3.9nH
C111
33p
SCDY0004101
COU
3
IN
2
OUT
1
TER
4
VREG_RF_SMPS
LDC151G9520Q-359
U104
C161 33p
1u
C157
C167
1p
R120
51
R122
120
33p
C142
C163
DNI
KMS-518
SW101
A C G1 G2
L121
3.9nH
C104
0.1u
C168
100p
1nH
L124
10p
C160
GND9
7
NC
22
PCS_RX1
PCS_RX2
21
PGND1
25
PGND2
26
8
UMTS_TX_RX
5
VC1
4
VC2
VC3
3
VDD
6
ANT
10
DCS_PCS_TX
13
DCS_RX1
20
DCS_RX2
19
EGSM_RX1
24
23
EGSM_RX2
16
EGSM_TX
1
GND1
2
GND2
GND3
9
GND4
11
12
GND5
GND6
14
15
GND7
GND8
17
18
2
8
RFOUT
VCC1
110
VCC2
VEN
5
4
VMODE0
3
VMODE1
LSHS-M090UH
FL101
U105ACPM-7381
6
GND1
GND2
7
GND3
9
PGND
11
RFIN
100p
C158
FL104
ACMD-7602
3 ANT 4
PGND
1
RX
2
TX
R121
120
C169
100p
C164
DNI
1nHC162
1p
C166
33p
C113
2.7nH
L103
15nH
C102
56nH
L104
C165
1.8p
O1
4
C156
10u
FL105
EFCH1950TDF1
G1
2
G2
3
G3
5
IN
1
PA_ON
PA_R1
WCDMA_2100_TX_OUT
RX_WCDMA_2100
PWR_DET
[Fig. 4.14] Schematic of the WCDMA Tx Block
TP1
TP2
TP3
TP4
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LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English