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
BOT
U2002
TP2(1.8V)
TP1(1.3V)
TP3(2.05V)
C2061
100n
100n
C2062
100n
C2063
100n
C2064
100n
C2066
C2067
100n
C2068
100n
C2069
100n
100n
C2070
C2060
100n
100n
C2073
C2090
100n
100n
C2091
C2095
100n
C2096
100n
4.7u
C2058
C2074
100p
C2105
1u
C2071
DNI
C2065
DNI
+1V3_VREG_L4
42
127
136
97
111
108
51
67
83
44
117
98
116
118
40
65
76
66
53
85
37
55
24
31
25
28
26
87
91
92
84
109
139
131
138
130
140
132
141
133
126
119
112
95
103
TX_HB
TX_MB4
TX_MB3
TX_MB2
TX_MB1
TX_LB4
TX_LB3
TX_LB2
TX_LB1
TX_BB_IP
TX_BB_IM
TX_BB_QP
TX_BB_QM
DAC_REF
PRX_BB_IP
PRX_BB_IM
VDD_DI
O
VDD_RF1_D_F
E
VDD_RF1_D_LBLO VDD_RF1_D_MBL
O
VDD_RF1_G_B
B
VDD_RF1_G_LNA VDD_RF1_G_PLL VDD_RF1_G_VCO
VDD_RF1_JDE
T
VDD_RF1_P_FELO_
2
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_UP
C
VDD_RF2_D_B
B
VDD_RF2_P_B
B
VDD_RF2_P_VCO VDD_RF2_S_VCO
VDD_RF2_T_B
B
VDD_RF2_T_DA VDD_RF2_T_PLL VDD_RF2_T_VCO
VDD_RF2_X
O
VDD_RF1_P_FELO_
1
+2V05_VREG_L15
DNI
C2089
DNI
C2092
DNI
C2094
+1V8_VREG_S3A
10
u
C2057
C2100
100p
WTR_DAC_IREF
TX_OUT_B1_B2
TX_OUT_GSMHB
TX_OUT_GSMLB
TX_OUT_B4
TX_OUT_B5
TX_OUT_B17
TX_OUT_B7
WTR_TXBB_I_P
WTR_TXBB_I_M
WTR_TXBB_Q_P
WTR_TXBB_Q_M
WTR_PRXBB_I_P
WTR_PRXBB_I_M
111
55
31
STAR CONNECTION
85
118
127
136
51
76
40
67
98 117
116
97
28
25
37
24
42
53
108
44
26
65
66
TP1(1.3V)
TP2(1.8V)
TP3(2.05V)