too high voltage of LTMx_RUNx pin of DC/DC convertrs
Run pins (LTMx_RUNx) of DC/DC converters are driven be voltage (depending on power supply voltage, it can be ~11V) above its absolute maximum rating (6V). According to the manual, the pins could be left floating. We tested this it works. It is the most straight forward solution. The solution requires removing of R633, R634, R631 and 632. An internal pull-up current source will start the converter. Moreover, in order to disable the converter, the jumpers (J23-26) should pull this pin to ground (remove R441, R442, etc.).