LG KG270 Service Manual - Page 53
Power On Trouble
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Page 53 highlights
- 54 - REXT D12 A9 XOX A8 XO C115 2.2u (1608) (16V,K,X5R) VRF1 C111 1u VBAT VSS2 VSS1 VDD_SIM B9 B8 VDD_RTC R7 R6 VDDP_IO F6 VDDP_MEM VDD_PLL L4 G10 VDD_MAIN2 VDD_MAIN1 J7 G9 L102 18nH 2V85_VSIM 2V0_VRTC 2V8_VIO 2V8_VMEM C113 1u VDD_LBUF J13 VDD_LANA VDD_LRF2V5 K15 F15 VDD_LRF1V5 VDD_LMEM B11 VDD_LSIM K10 VDD_LIO VDD_LD1 M11 J10 VDD_LRTC G12 K12 R101 22K IREF VREFP G13 C114 220n AGND G15 W_LED_FBN G14 C112 1u W_LED_FBP J12 J14 VBAT_4 VBAT_3 H14 H15 VBAT_2 VBAT_1 F12 H13 R100 6.8K BAT100 2V0_VRTC C101 2.2u VD1 2V5_VANA (1608) C106 1u C107 1u C108 1u C109 1u C110 1u VD1 2V8_VIO 2V85_VSIM 2V8_VMEM 1V5_VRF0 3V2_VBUF CIRCUIT C113 V_ANA 2.5V C110 1.5V VRF0 C109 EGV IC C110 C106 26Mhz C108 V_SIM 2.85V C107 2.8V V_IO C109 V_MEM 2.8V C101 V_BUF 3.2V LDO VOLTAGE PART C101 C107 C111 TEST POINT Check Points -Battery Voltage( Need to over 3.35V) -Power-On Key detection (PWRON signal) -Outputs of LDOs from EGV 4.3 Power On Trouble 4. TROUBLE SHOOTING
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