LG KU250 Service Manual - Page 83
Checking RF Rx Level
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4. TROUBLE SHOOTING 4.6.3 Checking RF Rx Level TP1 Vbias TP3 TP2 TP4 ANT101 ANT102 1p C437 C450 22p L101 NA C102 NA SW100 G2 ANT RF G1 KMS-507 TP1 C101 56p L102 100nH TP2 WCDMA Rev.D L404 1.8nH 0.5p L125 FL104 4 PGND 3 ANT RX 1 TX 2 ACMD-7602 C162 3.3p 51R119 4 1 50OHM OUT +VPWR C155 C158 4.7u 15p L123 1nH IN 2 3 COUP 20dB U102 CP0402A1950DNTR C164 0.5p R121 R120 130 47 7dB R122 130 PWR_DET Rev_1.0 C165 1p WS2512_TR1G U103 10 VCC2 1 VCC1 9 GND4 RFIN 2 8 RFOUT GND1 3 7 6 GND3 11 GND2 BGND VCONT 4 5 VREF RD U500 Vbias C159 15p +VPWR C154 1.5p L122 NA TP4 Rev_1.0 C157 10nH FL102 4 5 EFCH1950TDF1 O1 G3 1 IN G2 G1 32 PA_R0 TR100 KRX102U TP3 1 5 2 C192 100p 4 3 PA_ON Rev.B VREG_TCXO_2.85V C170 0.1u L128 1.8nH C174 10p Rev.D L407 2.7nH VDD_RX C156 100p L121 1nH Rev.D C161 2.2p L409 4.7nH Rev.D C444 2.2p L408 10nH 54 1 G2 O2 FL103 IN G1 O1 EFCH2140TDE1 23 L410 4.7nH L411 4.7nH C445 2.2p - 84 -
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