How to Check Xiaomi Mi4S Motherboard fault?

Is your Xiaomi Mi4S Motherboard is having a fault? Ask our technical experts how to resolve the issue.

I have a fault in my Xiaomi Mi4S smartphone and I do not know how to trace this fault. I have also removed the back cover and tried to resolve it but did not succeed. It was working normal and in the morning it gets switched off and never switch on again unless I press the power button.
I have also attached a picture of the picture. If anyone knows how to trace the fault please help me.