padfone(a80) not start os

Hi @turumba ,

When you say “…but if i plug usb then everything is working very well. “, do you mean that you are plugging in the USB charge adapter into the phone?

If you do mean this, then it seems that if your phone works OK when the power is connected to it but not when it is working on the phone’s battery only, then there is a problem with the phone’s battery.

How old is the battery? Even rechargeable batteries have a life span.

I suggest that you replace the battery and then check if the phone works OK.

Here’s a link a video which may be of some help. I realize that it is not your exact model, but as I couldn’t find a dis-assembly video for your model I though that this may be close enough to be of some help

replacement batteries are available online. Just search for Asus Padfone A80 battery to get results for suppliers of the part.