LG KE990 Service Manual - Page 88
Checking RF Tx Level
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4. TROUBLE SHOOTING 4.5.2 Checking RF Tx Level TP1 ANT100 ANT101 ANT102 L100 0 C102 NA L101 0 C104 NA PQ G1 A C G2 KMS-518 SW100 C101 120p L102 22nH ANT 11 ANT_SEL0 ANT_SEL1 VREG_RF_SMPS C113 C114 1000p 1000p C195 1000p 19 20 VC1 VC2 21 VDD 9 GND1 10 GND2 12 GND3 13 GND4 14 GND5 16 GND6 18 22 GND7 GND8 NC2 24 NC1 23 GSM850_RX1 1 2 GSM850_RX2 3 GSM900_RX1 4 GSM900_RX2 5 GSM1800_RX1 GSM1800_RX2 6 GSM1900_RX1 7 GSM1900_RX2 8 15 GSM1800_1900_TX 17 GSM850_900_TX LMSP43QA-538 FL100 Schematic of the GSM Tx Block C717 4.7p TP3 TP2 C136 6.8p L112 15nH C138 NA C146 2.7p C142 5.6nH L113 5.6nH 17 GND8 16 GND7 15 DCS_PCS_OUT 14 GND6 DCS_PCS_IN 1 13 GND5 BS 2 12 VCC 11 GND4 U101 TQM7M5003 3 TX_EN 4 VBATT 10 GND3 5 GND1 9 GSM_OUT VRAMP 6 8 GND2 GSM_IN 7 TP1 TP2 TP3 Test Point of GSM Tx Block Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 89 - LGE Internal Use Only