Blank Display problen in LG G2 creates due to bad lcd or bad connections on motherboard. We can solve blank lcd problem by changing LCD only if it is damage. But some time lcd connector on motherboard faulty, Check each point on motherboard with multi meter and apply jumper any damage point as shown in diagram below.
LG G2 D802 Blank Display Problem Solution Full Jumper Diagream
We are not responsible any fault during mobile repairing. Try this method on your own risk.

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