those main boards burn out fast. I owned 3 panthers and they all burnt out fast. You can buy an entire new board for fairly inexpensive. I cant remember were I got mine. its been awhile. also. More better approach is also what i did. buy a new robot board. they make them for tanks and they are small. I put them in all 3 of my panthers. they work great now...(also have done some other mods. and am in the process of doing more mods...) anyway.... I know i wasnt much help but just keep googling. You gotta love the internet... so much info out there. Not like in the days when i grew up....
check out one of my panthers....