Apple iPhone 5G black screen n getting hot if plugin charging

Hi, I tried to fix my iPhone 5G for broken LCD, I switched off the device while fixing. It was working fine when I was testing the new LCD but after moving all parts to new LCD it wont turned ON this time and phone is becoming HOT if you plugin charger. Phone is detecting by the computer and iTune as well. I tried some basic tips like Home button + Power button, removing battery, tried new battery, another LCD n old broken LCD but nothing worked, I also tried to Restore it but it wont get restored. Any help will be highly appreciated....