LG KU250 Service Manual - Page 80
Checking UMTS Block
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4. TROUBLE SHOOTING 4.6 Checking UMTS Block 4.6.1 Checking Tx level TP1 TP2 TP2 WCDMA Rev.D L404 1.8nH 0.5p L125 FL104 4 PGND 3 ANT RX 1 TX 2 ACMD-7602 TP3 TP4 ANT101 ANT102 1p C437 C450 22p L101 NA C102 NA SW100 G2 ANT RF G1 KMS-507 TP1 C101 56p L102 100nH Rev.D C162 3.3p 51R119 4 1 50OHM OUT TP3 +VPWR L123 1nH IN 2 3 COUP 20dB U102 CP0402A1950DNTR C164 0.5p R121 R120 130 47 7dB R122 130 PWR_DET C155 C158 4.7u 15p 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 U500 C159 15p +VPWR 11 C154 1.5p L122 NA Rev_1.0 C157 10nH FL102 4 5 EFCH1950TDF1 O1 G3 1 IN G2 G1 32 PA_R0 TR100 KRX102U TP4 1 5 2 C192 100p 4 3 PA_ON Rev.B VREG_TCXO_2.85V C170 0.1u For testing, Max power of UMT 2100 is needed. - 81 -
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