Iphone 4s water damage – no display


I have an Iphone 4s, that is water damage.
I have noticed that the iPhone is been recognized on the laptop in took about 10-20min to boot.(maybe I will need to replace the battery).
After I noticed that the iPhone keeps doing chime sound of plugging battery.
And it’s not showing any image on the display(I have replaced the lcd) but not 100% dark, maybe 90%. Any ideias regarding the issue with the display? Coil?IC?