Ac/DC Ceiling Fan help

Hello;

guys i need some info from technical guys here.

I have Khursheed Ac/DC fan but its malfunctioning now, it doesn’t run on AC but it runs fine on DC.

Since it has two inputs, One AC and Other DC. If both buttons are turned on than Fan runs on Ac and when there is power outage, it switches to DC automatically.

I want to know about its circuit,

I believe that Fan actually runs on DC current, Ac current is converted to DC by its circuit and other DC connection is DC itself.Am i right in this regard??

or Fan really operates at AC and DC and circuit only switches in between.??

Probably right. It might be some simple rectifier circuit. AC-DC circuit might have been damaged due to any reason.