SOLUTION:
L''G phone have backup baterry for clock and etc.Sometimes,if phone was flashed with not correct flash file,this backup baterry keeps in phone RAM some ****,which not allows to power ON phone.Solution is one-to dissasemble phone,to find backup baterry and to short it or disconnect it for few minutes.If you can't find backup baterry on main PCB,you need to disconnect flex cable from flip for few minutes,because some LG phones have backup baterry in flip.
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