Checking Umts Block - LG KF700Q Service Manual

4.16 Checking UMTS Block

4.16.1 WCDMA2100 Checking TX level
TP1
KMS-507 KMS-507
SW101 SW101 C105 C105
G2 G2
ANT ANT RF RF
G1 G1
56p 56p
FL101 FL101
D5015 D5015
PCS_RX1 PCS_RX1
PCS_RX2 PCS_RX2
2
ANT ANT PCN_RX1 PCN_RX1
PCN_RX2 PCN_RX2
1
GND1 GND1 EGSM_RX1 EGSM_RX1
8
GND2 GND2 EGSM_RX2 EGSM_RX2
10 10
GND3 GND3
23 23
GND4 GND4 GSM850_RX1 GSM850_RX1
24 24
GND5 GND5 GSM850_RX2 GSM850_RX2
WCDMA_2100 WCDMA_2100
WCDMA_850 WCDMA_850
WCDMA_1900 WCDMA_1900
PCN_PCS_TX PCN_PCS_TX
GSM850_EGSM_TX GSM850_EGSM_TX
VREG_RF_2.85V VREG_RF_2.85V
C129 C129
33p 33p
L115 L115 4.7nH 4.7nH
C169 C169 33p 33p
C171 C171
DNI DNI
FL104 FL104 B7683 B7683
ANT ANT TX TX
L121 L121
1.5p 1.5p
RX1 RX1
RX2 RX2
GND1 GND1
L122 L122
GND2 GND2 GND5 GND5
NA NA
GND3 GND3 GND4 GND4
L125 L125
1.5p 1.5p
TP2
GND3 GND3 GND4 GND4
GND2 GND2 GND5 GND5
GND1 GND1 GND6 GND6
TX TX
L131 L131 1nH 1nH
C194 C194 33p 33p
ANT ANT RX RX
FL106 FL106 B7646 B7646
C1001 C1001
DNI DNI
C1003 C1003 15p 15p C1004 C1004 33p 33p
RX_WCDMA_2100 RX_WCDMA_2100
L133 L133
2.2nH 2.2nH
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
18 18
19 19
16 16
17 17
14 14
15 15
12 12
13 13
20 20
WCDMA_2100 WCDMA_2100
21 21
WCDMA_850 WCDMA_850
22 22
9
11 11
RX_W_2100_LNA_OUT RX_W_2100_LNA_OUT
U103 U103
LDC15836M20Q-360 LDC15836M20Q-360
L120 L120 2.7nH 2.7nH
C177 C177 56p 56p
RX_WCDMA_850_P RX_WCDMA_850_P
C180 C180 C181 C181
1.2p 1.2p
DNI DNI
L123 L123
12nH 12nH
RX_WCDMA_850_M RX_WCDMA_850_M
R116 R116
PDET_IN PDET_IN
82 82
PWR_DET PWR_DET
13 13
14 14
15 15
TP3
16 16
17 17
U105 U105
18 18
LDC151G8820Q-359 LDC151G8820Q-359
L130 L130 2.2nH 2.2nH
C188 C188 5.6p 5.6p
C199 C199 C195 C195
DNI DNI 1p 1p
C1002 C1002
PWR_DET PWR_DET
[Fig. 4.18] Schematic of the WCDMA Tx Block
- 111 -
4. TROUBLE SHOOTING
VREG_RF_2.1V VREG_RF_2.1V
C170 C170
120p 120p
L114 L114
2nH 2nH
L117 L117
C172 C172 33p 33p
3.9nH 3.9nH
C173 C173
0.75p 0.75p
C178 C178
2200p 2200p
C186 C186
2200p 2200p
NC4 NC4 VCC1_CELL VCC1_CELL VREG_WCDMA_PA VREG_WCDMA_PA
6
RFOUT_CELL RFOUT_CELL RFIN_CELL RFIN_CELL
5
NC5 NC5 VMODE_CELL VMODE_CELL
4
RFOUT_PCS RFOUT_PCS VREG_CELL VREG_CELL
3
NC6 NC6 RFIN_PCS RFIN_PCS
2
NC7 NC7 VREG_PCS VREG_PCS
1
C198 C198 C189 C189
4.7u 4.7u
1000p 1000p
RF5184 RF5184
U104 U104
2200p 2200p
VREG_RF_2.85V VREG_RF_2.85V
L132 L132
C1005 C1005
C1006 C1006
1nH 1nH
2200p 2200p
1000p 1000p
L116 L116 1nH 1nH
WB_MIX_INM WB_MIX_INM
2 3
G1 G1 O1 O1
1
FL103 FL103 C174 C174
IN IN
SAFEB2G14FA0F00 SAFEB2G14FA0F00
G2 G2 O2 O2
0.5p 0.5p
5 4
L118 L118 1nH 1nH
WB_MIX_INP WB_MIX_INP
PA_ON0 PA_ON0
VREG_RF_2.85V VREG_RF_2.85V
FL105 FL105
4 5 EFCH836MTDB1 EFCH836MTDB1
L126 L126 O1 O1 G3 G3 1
WCDMA_850_TX_OUT WCDMA_850_TX_OUT
IN IN
18nH 18nH
G2 G2 G1 G1
3 2
C187 C187
DNI DNI
FL107 FL107
SAFEB1G95KA0F00 SAFEB1G95KA0F00
3
L128 L128
G3 G3
4 1
OUT OUT IN IN WCDMA_2100_TX_OUT WCDMA_2100_TX_OUT
2.7nH 2.7nH G2 G2 G1 G1
5 2
C196 C196 C197 C197
DNI DNI DNI DNI
VREG_RF_2.85V VREG_RF_2.85V
PA_ON1 PA_ON1
TP4
LGE Internal Use Only