I blew the phase A mosfets in my old Kelly KBL48301X controller a while back, and ordered a new KBL48501E controller as a replacement/upgrade, then sent the KBL48301X back to the factory for repair. Their tech guy looked at it the same day they received it and I got this in an email:
We found A phase are damaged.
And our engineer found there is 2.2ohm resistor with issue for power supply part
And he used a direct wrie to do the testing.Then the Phase C problem is we worse than when we received it.
There is a little problem with Phase C when you send it out.
Right now there are two many Mosfets damaged on controller.
So we will not repair this controller.
We will ship a new KBL48301X controller with joystick for you as replacement directly.
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