LG KG270 Service Manual - Page 50
TX Trouble
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TX Trouble TEST POINT 4. TROUBLE SHOOTING CIRCUIT TX_RAMP R402 1K C401 39p U400 HB RF Input LB RF Input U102 (50V,J,NP0) (16V,K,X7R) (10V,Z,Y5V) (50V,J,NP0) (50V,J,NP0) VBAT VBAT C403 12p C404 C402 0.01u 10u (2012) C405 33p C406 18p C407 C408 27p 0.01u VAPC 20 VBATT 17 VCC1B 6 VCC1A 2 R406 0 C411 C412 NA NA R410 0 C415 NA C416 NA 16 GND9 14 GND8 GND7 13 12 GND6 10 GND5 GND4 9 8 GND3 7 GND2 GND1 5 15 DCS_PCS_OUT (50V,J,NP0) (16V,K,X7R) DCS_PCS_IN 3 11 EGSM_OUT 19 RSVD_GND U400 SKY77318 EGSM_IN 4 18 ENABLE 21 P_GND BS 1 C413 27p C414 27p R404 0 R405 0 L402 NA C409 NA DCS_PCS_OUT TXON_PA BS R407 0 R408 NA R409 NA GSM_OUT Waveform Paon & BS ASM Vapc CHECKING FLOW Check Control Signals Signals are Normal ? N o Check ULC2(U102) Yes PAM Control Signal is OK. See next page to check ASM & Mobile SW Circuit. - 51 -
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