LG KE990 Service Manual - Page 90
Checking PAM Block
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4. TROUBLE SHOOTING 4.5.3 Checking PAM Block 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 17 GND8 16 GND7 15 DCS_PCS_OUT TP1 TP2 GSM_PA_BAND GSM_PA_EN C137 C135 1u 33u +VPWR TP3 R117 2.2K C143 68p GSM_PA_RAMP 32 G2 G1 IN O1 G3 1 45 EFCH836MTDB1 FL101 GSM_PA_BAND MODE LOW HIGH GSM850/900 DCS/PCS Schematic of PAM Block R112 100 R111 68 10 dB R113 100 DCS_PCS_TX R114 68 R118 100 10dB R119 100 GSM_TX TP3 TP1 TP2 Test Point of PAM Block Test Point TP1 TP2 TP3 Net name GSM_PA_RAMP GSM_PA_EN +VPWR Description Power Amp Gain Control. Typically, 0.2 ~1.6V Power Amp Enable (ON : >2.5V, OFF : 3V) Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 91 - LGE Internal Use Only