Trusty mini 2 continues throwing temperature errors.
I’ve replaced the Rambo (MOSFETs burned), continuity tested from thermistor to molex connector ins and outs and all the way to the board, thermistors both correct ohm reading. Printer displays 20c for nozzle at startup. And 0 for build plate. Time to replace plate heater and its thermo??
Double checked that and it is as shown.
Swap the extruder and bed thermistor plugs, see if the reading moves. If you get a “bed” reading from the hotend thermistor, then the board is probably fine, and your problem is wiring or thermistor for the bed.