[EVDL] fried mosfets in an ebike

Hi
My friend Hanan's electric bike controller went kaput.
Three or four of the IRF1010e n-channel mosfets from his pre-2007 BL-36
controller
[limited info at
http://66.216.110.131/Wildernessenergy_BL_36_controller_p/ctpl-bl36-pf.htm ]
are toasted.
Having recently seen a micrograph of dielectric breakdown in a capacitor
I suggested that maybe he could diagnose the problem as either too-high
gate-drain voltage or too-high source-drain current [i think i have the
terminology right] by looking at the burnt mosfets in a microscope.
Is this possible e.g. by etching away the plastic with acid, or prying it off?
In any case does anyone have advice - should he replace them mosfets or
get a new controller?
Thanks
JR

Jeremy Rutman
Technion Physics Dep't.
Haifa 32000 Israel
phone 972 4 8293669
fax 972 4 8295755

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