iPhone 3GS 16GB - Display and Digitizer nor working - No Water Damage

I recently unlocked my phone through AT&T and iTunes. As soon as I did this, I opened my phone to check the battery no., so I can order a replacement. Mistakenly, I damaged the no. 3 connector (not the cable)(no.3 is for light sensor and earphone speaker). Display was working fine until then.

But, when I tried to put just no.1 and 2, first the screen turned white. I thought my display was gone. I ordered new display and digitizer from Amazon. New display also showed white screen that too for only couple of seconds. Then onwards, both the displays (original and replacement) shows nothing.

I tried DFU, Restoration, Home+Power, Rebooting, Resetting, all the possible tricks I could find online, nothing worked. I checked again and again, no. 1 and no. 2 connecters as well as cables all seem fine, no damage at all.

I can here the speaker sound when I connect to iTunes or charge, vibrator switch also works fine when battery has juice or phone is on charging. But I can't see anything on the display. Digitizer is also not working because when I swipe the screen on top after pressing power button for a while, it should turn off the phone. Or, when I swipe at the bottom of the screen after pressing power button for one time, it should unlock the phone.

I think, motherboard (logic board) is Okey because I tried restoring my phone so many times and it restored all the time (to iOS 5.1.1) with congratulations messages for successful restore and unlock.

I never head any water damage, I also rechecked all the (at least 4) water damage indicators, none of them turned red - all are white and normal.

Please help me if somebody have any solution or suggestions.

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