LG KU250 Service Manual - Page 86
Checking RF Tx level, 7.2 Schematic of RF Tx level
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Page 86 highlights
4. TROUBLE SHOOTING 4.7.1 Checking RF Tx level TP1 TP3 TP2 4.7.2 Schematic of RF Tx level TP1 C102 NA SW100 G2 ANT RF G1 KMS-507 L108 Rev.D 15nH C117 10p C101 56p L102 100nH U500 Rev.C ANT 11 19 VDD 7 8 GND1 GND2 10 GND3 12 GND4 13 GND5 15 17 GND6 20 GND7 21 GND8 23 GND9 GND10 GSM900_RX1 5 6 GSM900_RX2 1 GSM1800_RX1 2 GSM1800_RX2 3 GSM1900_RX1 GSM1900_RX2 4 WCDMA2100 9 D5011 CTRL1 18 CTRL2 22 16 GSM900_TX 14 GSM18001900_TX 1K 1K R100 R101 ANT_SEL0 ANT_SEL1 C110 C109 33p 33p GSM_PA_RAMP L115 18nH C124 100p Rev.D L403 1.5nH L116 10nH C123 0.01u C121 33u 100ohm R107 C137 NA C441 5.6p C438 100p C138 NA C139 68p C134 0.01u VAPC 20 VBATT 17 VCC1B 6 VCC1A 2 TP2 TP3 15 DCS_PCS_OUT 3 DCS_PCS_IN U101 11 EGSM_OUT EGSM_IN 4 19 RSVD_GND ENABLE 18 21 P_GND SKY77318 BS 1 7 GND1 8 GND2 GND4 GND3 10 GND5 12 GND6 13 GND7 GND8 GND9 5 9 16 14 - 87 -
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