
4. TROUBLE SHOOTING
- 108 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of UMTS Band1/4 RF DRX Level.
START
Check TP1 Signal exist?
Check RF(M/S)
No
Yes
Check WTR1605L
Yes
Yes
Check TP2
Signal exist?
Check TP3
Signal exist?
Check SP4T(U1201)
Check SAW(FL1202)
No
No
C1209
1n
VA1201
100p
C1215
10n
C1213
C1214
100p
U1201
8
7
6
5
9
4
10
3
11
2
12
1
13
14
15
16
17
PGND
NC
RF
2
GND5
RF
1
VDD
GND4
V3
ANT
V2
GND3
V1
RF5
GND1
RF
4
GND2
RF
3
C1211
DNI
100p
C1216
L1208
10n
C1210
DNI
C1208 100p
ANT1203
MCE62492901
FEED
ANTENNA
L1209
DNI
ANT1202
MCE62492901
FEED
ANTENNA
100p
L1212
VDD_RF_SW
DRX_SEL_1
LU1_LU4_DRX
LU2_DRX
U900_DRX
DRX_SEL_0
DRX_SEL_2
FL1202
4
5
1
3
2
G1 O1
IN
G2 O2
DNI
L1225
C1221
1n
L1223
1.8n
1p
L1220
L1222
100p
1.8n
C1222
100p
L1230
1.8n
L1231
DRX_LU2100_L4_L7_INP
LU1_LU4_DRX
DRX_LU2100_L4_L7_INM
LTE_AWS & UMTS_1 DRX
TP1
TP3
TP2