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Dear friend: First get the lcd checked Second connector of lcd Third display driver crystal IC Fourth get the smps ic power controller checked Fifth get the line checked (lcd ic to lcd connector) and last get the omap (cpu) checked
possible the firmwar is damage or sum ics have burn because of a power spike, or brownage while it was on charge, take it to a repair shop to be checked
solution 1> fit a new LCD, solution 2> if lcd fails its the display IC's. 2 x crystal like ics on the motherboard, replace them or have them replaced and your phone working 100% BR
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