Unable to restore iPhone 6

My phone suddenly went on a black light permanent screen and dead, and iTunes does not detect the phone unless I use the sleep + home button 10 sec and go to DFU mode

When trying to restore to last IOS 8.4 everything are good but when ituns is at (WAITING FOR IPHONE) my phone show logo and line bar under logo on screen and nothing happened i wait for 1 or 2 hour and logo seems is freeze and finally itunes says Unable to restore iphone. Unknown error (9).

I check everything and remove all flat cable on logic board and battery and reassemble that but problem exist .

Please help me!