Checking Transceiver Dc Power Supply Circuit Block - LG -D855 Service Manual

3.2 Checking Transceiver DC Power Supply Circuit Block

TP1(1.3V)
TP3(2.05V)
+1V8_VREG_S3A
+2V05_VREG_L15
162
WTR_B5_B8_TX_LB1
153
WTR_GSM_LB_TX_LB2
163
WTR_B17_B20_TX_LB3
154
WTR_B28_TX_LB4
146
138
WTR_GSM_HB_TX_MB2
139
WTR_B1_B2_TX_MB3
LGE Internal Use Only
U1500
NOTE1
54 129 98 126 80 62 157 114 147 116 100 103
TX_LB1_OUT
TX_LB2_OUT
TX_LB3_OUT
TX_LB4_OUT
TX_MB1_OUT
TX_MB2_OUT
TX_MB3_OUT
TP3(2.05V)
<Main Top>
REV10
NOTE2
79 78 48 90 137 149 115 135 136 52 59 93 74 25 31 72 38 14 11 22 57
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3. TROUBLE SHOOTING
TP2(1.8V)
TP1(1.3V)
TP2(1.8V)
NOTE1
34
TX_BB_IM 160
TX_BB_IP 151
161
TX_BB_QM
TX_BB_QP 152
108
Only for training and service purposes
+1V3_VREG_L4
C1524
10u
WTR0_TXBB_I_N
WTR0_TXBB_I_P
WTR0_TXBB_Q_N
WTR0_TXBB_Q_P