vss and vdd short circuit

My devo 7E(this is another one making for my friend) works fine, until I try to fix the component too crowd problem, I want to remove the protection plastic layer of wfly module(not seen at here, it's at the back of devo7E but it is at the position of throttle) and save 1mm or 2mm. Then the devo 7E won't turn on. I use multimeter find out the red and the black of the throttle is short circuit, it's not the throttle part, it's at the motherboard part. So, even I put back the protection layer, they aren't fixed. I also check the mcu. all vdd and vss legs , that are vdd_1 vss_1, vdd_2, vss_2, vdd_3, vss_3, vdd_4, vss_4, vdda, vssa are short circuit. Any clue which part it is broken?

I check the motherboard 's plug, label as THRO, AILE, RUDD, ELEV's red and black wire are all short circuit.

I think it's 95% the mcu is broken, lol. I am done with mcu...