Fubared mosfet in induction heater

[wkb]

Last week I received an induction heater toy from Banggood.  This one http://www.banggood.com/5V-12V-ZVS-Induction-Heating-Power-Supply-Module-With-Coil-p-1015637.html

Unfortunately it was a DOA (BG is sending a refund), it emitted the magical smoke on first powerup (dead short between the power input terminals).

Doing some investigation and it looks one (or maybe both) of the mosfets (?) is/are dead. 

Sofar I have not found the magical Google search string to identify it.  Someone who has a clue based on attached picture?

[MK14]

I'm NOT 100% sure, but my best guess so far is...

ON Semiconductor NTB30N06G

http://www.digikey.com/product-detail/en/NTB30N06G/NTB30N06G-ND/1484676

[Miyuki]

Any of many Chinese 30A 60V mosfet
They use local manufactured parts mostly copy of any big brand with similar labelling

but it is "current"n"voltage" system