I have 2 Flipsky FSESCs like the one seen in this picture. Yesterday, one of them was disconnected during a ride, and after re-connecting it to power, it won't power on. No LED lights, nothing. I probed the 5V rail and I'm getting 5.1V, but when I probe the 3.3V rails, I'm getting 0V. This leads me to believe that the DRV8302 chip is working as it should be. The VREG (579-TC2117-3.3VDBTR) on the back of the PCB is heating up.
I assume that once I replace the VREG, it should power right up and things will work as expected. But, in the case that it doesn't, I'm wondering if I should be keeping an eye out for any other components that could be causing the issue. Any help or insight is greatly appreciated.
Cheers!
UPDATE: I learned that if a VESC 4.12 based ESC is disconnected from the battery during a ride, and you attempt to brake, regenerative braking will kill the ESC because the power has nowhere to go.
I began buzzing out the FSESC with a multimeter and realized there’s a short between the 3.3V rail and GND on the entire FSESC. I desoldered the VREG and the short remains. I’m waiting on a hot air reflow station to arrive in order to desolder the MCU. Once the MCU is removed, I’ll check on the short and report.
Pop the two protection diodes (marked sl) off and re test
sorry wrong board, it's late lol. But there may be a diode shortedand causing the issue