Hello, My orignal controler started smoking and burnt out a part of the circuit board???

(one of the copper strips. not a componant) any thoughts??
anyway I bought what is listed as a 'new unused' one off ebay as there always seems to be 'alot' of broken down henglong tanks on ebay all unused??
so I put batterys in new controler...NO red light

but it still works all buttons do what they ment to do, but the forward trim tab has to be set fully forward as if its in the middle the the tank moves backwards all by its self??

dunno??