Xperia ion Help with Brick topic

Ok so my phones brick state isnt normal and doesnt fit either of the recovery threads

This is what happened

2 months ago i ordered a xperia ion display since mine was broken
so i had disassmebled the phone and kept the parts apart
now after 2 months i got my display and i reassembled my phone

But now the phone wont boot up
or Respond to power+vol up,power+vol down

so i charged for 16 hours and got red led and then it disappered
Then i used rubber band trick and tried flashtool for 6 hours but still no flashmode
Red led comes and goes
Even on wall charger

What can be the problem

Btw this is not my first itme nor am i a noob

Had recovered soft brick by rubber band trick 2-3 times

But this time no bootloop,just a red led and even that disappears