3. TROUBLE SHOOTING
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Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.2 Checking Transceiver DC Power Supply Circuit Block
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U1500
TP2(1.8V)
TP3(2.05V)
TP1(1.3V)
22n
R1514
100n
C1510
C1504
100n
C1505
100n
C1506
100n
C1507
100n
C1508
100n
100n
C1511
100n
C1512
R1515
0
C1517
100p
+1V8_VREG_S3A
+2V05_VREG_L15
1u
C1500
C1501
4.7u
100n
C1515
C1514
100n
C1516
100n
C1522
100n
C1518
100n
C1519
100n
C1524
10u
C1502
100p
100n
C1520
C1521
100n
C1523
100n
DNI
C1509
C1513
DNI
+1V3_VREG_L4
DNI
C1503
34
57
22
11
14
38
72
31
25
149
100
116
139
138
146
154
163
153
162
147
157114
129
126
62
80
98
54
136
115135
137
48
78
90
79
74
93
52 59
103
108
161
152
160
151
TX_BB_IP
TX_BB_IM
TX_BB_QP
TX_BB_QM
VDD_DI
O
VDD_RF1_G_B
B
VDD_RF1_G_LNA
VDD_RF1_G_PLL VDD_RF1_G_VCO
VDD_RF1_P_PLL
VDD_RF1_P_VC
O
VDD_RF1_S_PLL VDD_RF1_S_VC
O
VDD_RF1_T_DA
VDD_RF1_T_LO
VDD_RF1_T_SYN
VDD_RF1_T_UP
C
VDD_RF2_D_B
B
VDD_RF2_P_BB
VDD_RF2_P_VC
O
VDD_RF2_S_VCO
VDD_RF2_T_BB
VDD_RF2_T_DA
VDD_RF2_T_PL
L
VDD_RF2_T_VCO
VDD_RF2_XO
TX_LB1_OUT
TX_LB2_OUT
TX_LB3_OUT
TX_LB4_OUT
TX_MB1_OUT
TX_MB2_OUT
TX_MB3_OUT
VDD_RF2_FBRX VDD_RF2_PR
X
VDD_RF1_T_VCO
VDD_RF1_P_HB_LO
VDD_RF1_D_LB VDD_RF1_P_L
B
VDD_RF1_D_LO
M
VDD_RF1_D_LB_L
O
VDD_RF1_D_M
B
VDD_RF1_D_HB
VDD_RF1_P_HMB_LO
VDD_RF1_P_HM
B
WTR0_TXBB_I_P
WTR0_TXBB_I_N
WTR0_TXBB_Q_N
WTR0_TXBB_Q_P
WTR_B5_B8_TX_LB1
WTR_GSM_LB_TX_LB2
WTR_GSM_HB_TX_MB2
WTR_B1_B2_TX_MB3
WTR_B17_B20_TX_LB3
WTR_B28_TX_LB4
93, 7
4
52, 5
9
57
14
38
25
136
135
115
149
48
78
103
147 116
157
62
80
129
79
90
126
100
NOTE1
NOTE1
NOTE2
REV10
TP1(1.3V)
TP2(1.8V)
TP3(2.05V)