MC43FS VRef+ no output

hongxiang yu 2 years ago in Master modules / MC4x updated by Gustav Widén (System support) 2 years ago 1

Have any idea what is problem cause VRef+ (C1:7) no 5V output.  I can comfirm the PIN and controller are ok after i made test on bench.

What is problem cause 5V PIN stop output. possible CAN wrong or Any PINs short to ground ? No error informs why VRef do not output now

The most plausible explanation for seeing 0 V on the +VREF is if it is externally shorted to ground. 

The MC4x/XV4x automatically tries to reactivate the VREF, so when the short has been is removed, the VREF will turn on again.