stranger things on A10M , fails temps on hotend.

[puro]

Hello all , first of all , sorry for my english .
i want to say im very dissapointed with my A10M. first.. im not a newbie on 3d printing world..
i have three more printers , prusa mk3 , cr10s , ender 3 and i bought this A10M to test the extruder and mix
and play with it but no on the way that the printer is going now..

after 20 days of happy printing , yesterday something smokes a little on the middle of a print and i stopped the printer.

looking carefull i saw that the board blows.. why? i dont know... i had one board on spare and i switched...but the nightmare starts now.

changed the board and now i notice that the psu fan dont work.... its like the psu is dead or not fully working becouse the fan dont work and
all my 24v psu starts the fan when power on it. put one spare 24v psu on the A10M and when i swith on the hotend at for example 230.. the temp go high very fast and never stop and stay on the temp that i said.. if a put 230 go high very fast and stop one second on 230 and dance between 250 225 , 240... very erratic. i tried with other thermistor and same , other hot cartbridge and same...i tried flashing other marlin version .. nothing...

im run out of ideas.. im thinking on switch to one noozle , and change the board and end of the history.

any have any idea to test? thanks!!

[puro]

thanks for the idea , but the autotune fails becouse the hotend reaches de temp and pass it... never stop on the exactly number ...
i dont know if the board is faulty or what .. but i never find this strange problems on other printers.. usually when something fails you change it
and all run ok but with this printer im out ..weird things...