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4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Schematic of LTE Band8 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(FL1206)
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
942.5MHz
FL1206
4
5
1
3
2
G1 O1
IN
G2 O2
C1230
33p
L1233
12n
12n
L1232
L1234
12n
2.2p
C1229
DRX_U900_INP
DRX_U900_INM
U900_DRX
U8(EU)_DRX
TP1
TP2
TP3