LG KE990 Service Manual - Page 93
Power on trouble
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4. TROUBLE SHOOTING 4.6 Power on trouble Power on sequence of KE990 is : PWR key press → PM_ON_SW_N go to low (VA700, PM6635-2M KPDPWR_N pin#24) → PM6635-2M Power Up → VREG_MSMC_1.2V(C560), VREG_MSME_1.8V(R520), VREG_MSMP_2.7V(R513), VREG_MSMA_2.6V(R508), VREG_TCXO_2.85V(C510) power up → PON_RESET_N assert to MSM → Phone booting & PS_HOLD(D500) assert High to PMIC(PM6635-2M) Start Battery vo lt g. higher than 3 .2V? YES Press PW R key Keypad L ED on? YES VA700 h igh to low when key press? YES NO Change or charging the Batt ery NO Follow the LED trouble shoot NO Check open Pattern of power button Check Dome Sheet VREG_MSMC_1.2V, NO VREG_MSMP_2.7V, VREG_MSME_1.8V VREG_TCXO_2.85V, VREG_MSMA_2.6V Power up? Chang e the Main board YES NO Is c lock ok ? X100 : 19.2M X500 : 32.768Khz YES Chang e th e Main board Check the TXCO and SLEEP CRYSTAL LGE Internal Use Only - 94 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes