Remove the shield, found that CPU had mildew, days after washing, blow drying, add flux for soldering, phone back to normal. Had has four days and die, this screen light have more badly, even a Word also see not love, again plus welding CPU invalid, standby current also normal, whether software caused does? temporarily didn't ignored, first detection display following capacitor C40--C48 Shi, found C41, and C47, and C48 this three a capacitor voltage changes exception, replaced equal capacity value of capacitor, fault excluded, original is capacitor leakage caused.3aPservice manual download site