Hi I'm abhi, and I'm using Asus zenfone 5 16gb-2gb RAM. Since few days there was dust formation in my front cam which entered through front ear speaker. So I've opened the back case and also the mold panel undoing the screws. Then I've folded behind the front cam cleared the glass of display where the dust gathered also the cam. Then all the screws have been fixed back, and i have finally cheeked on my front cam it gave my resolution perfect like ever before, after viewing the pic in gallery when i went back to the cam mode the front cam has totally gone blank, like it's just a black screen with options when used by pixel master, but when used by other camera app's the front cam is using inverted rear cam directly, also the battery is draining fast as it's strip was removed and connected back. Please help me out in fixing front cam and battery problem. Hoping to get the solution asap. Thank you.