LG LG-D855 - Checking Transceiver DC Power Supply Circuit Block

3. TROUBLE SHOOTING
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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
100nC1510
C1504 100n
C1505 100n C1506 100n
C1507 100n C1508 100n
100nC1511 100nC1512
R1515
0
C1517 100p
+1V8_VREG_S3A
+2V05_VREG_L15
1uC1500
C1501 4.7u
100nC1515
C1514 100n C1516 100n C1522 100n
C1518 100n
C1519 100n
C1524
10u
C1502 100p
100nC1520
C1521 100n C1523 100n
DNIC1509
C1513 DNI
+1V3_VREG_L4
DNIC1503
345722111438723125149100116
139
138
146
154
163
153
162
147157114129 126 62809854 136115 1351374878 9079 749352 59103
108
161
152
160
151
TX_BB_IP
TX_BB_IM
TX_BB_QP
TX_BB_QM
VDD_DIO
VDD_RF1_G_BB
VDD_RF1_G_LNA
VDD_RF1_G_PLL VDD_RF1_G_VCO
VDD_RF1_P_PLL
VDD_RF1_P_VCO
VDD_RF1_S_PLL
VDD_RF1_S_VCO
VDD_RF1_T_DA
VDD_RF1_T_LO
VDD_RF1_T_SYN
VDD_RF1_T_UPC
VDD_RF2_D_BB VDD_RF2_P_BB
VDD_RF2_P_VCO
VDD_RF2_S_VCO
VDD_RF2_T_BB VDD_RF2_T_DA
VDD_RF2_T_PLL
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_PRX
VDD_RF1_T_VCO
VDD_RF1_P_HB_LO
VDD_RF1_D_LB
VDD_RF1_P_LB
VDD_RF1_D_LOM
VDD_RF1_D_LB_LO
VDD_RF1_D_MB VDD_RF1_D_HB
VDD_RF1_P_HMB_LO
VDD_RF1_P_HMB
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, 74 52, 59
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)