Carefoul with Trimpot Adjustment.

I try to make a trimpot adjustment because my Extruder dont have power to extrude filament,
I open the motherboard and i start to adjust.I measure my Voltage on extruder trimpot and was 0.89 V.I fix that,then i try to fix X,Y,and Z. Accidentaly multimeter red cable drops down and touch something in motherboard and Instantly damage it.
Now the printer dont work.I check the MB and i see one stepper driven chip its burned.

Here is the problem

So be carefoul with adjustment,and better take someone to help you..