Chosen Solution

my iphone fell down and got switched off. when I started it with the power adapter, the logo pops in the screen and then gets off again. This keeps on repeating and the home screen doesn’t opes up at all. is could be a motherboard issue..?

Probably, have you tried holding home button + lock button for 15 seconds? There might be damage to the lcd. So, I would try a new screen before calling it a motherboard failure

You iPhone may be stuck. Connect your device to your PC with usb cable, and then launch 3uTools. Try to enter dfu mode and then easy flash to restore your device.