F2801 board has been running for many days but currently error has been found out that the voltage of ADCREFM pin (1.43V) is higher than ADCREFP pin (1.3V).
After changing the 2.2uF Tan capacitors connected in these pins with two new capacitors, the board can work normally.
If then soldering back the original two 2.2uF Tan capacitor, the issue cannot repeat.
Would you please kindly help? Why was the voltage of ADCREFM pin higher than ADCREFP? Thanks!