Hello, Bought a project S3 on eBay with smashed screen and LCD. Also got a replacement LCD/frond housing. Rest of phone looked good, no water damage etc, clean. However the phone powers up, makes noise, vibrates, capacitive buttons light up and LED works as normal. Also the touch seems to work and makes sounds as I click around the screen. Computer sees the device as well. No display though. Screen remains black. I did notice later that in a dark environment there is a little back light on the LCD but still no image noticed. Is there a way to determine if this is a logic board issue or a possible defective replacement part. Thanks for any info or hints.