Multimeter not working after high voltage incident
I was using maxcom mx 620 multimeter to measure the output of a high voltage power supply (I'm an undergraduate mechanical engineering student and needed the power supply for a project). since the multimeter has a maximum of 1000 volts DC, I used two resistances in series and measured around one of them to reduce the voltage to a few hundred volts. This worked until one of the resistances some how failed, and the voltage went around it. The multimeter turned itself off. I turned the dial to the off position and back. and the screen had all the "setting indicators" displayed at the same time, and keeps giving a reading that increases until it reaches "OL", (which is usually given when the input exceeds the maximum allowed), without the test leads actually touching anything.
I disassembled the multimeter and found that a fuse inside had blown, but after changing it, the problem persisted. Is there any way to fix it?
Thanks in advance
Update (07/03/2017)
To my eyes, nothing is amiss. There are no burn marks, no inflated capacitors, no cracked components. Unfortunately, I have nothing to test the diodes with, as I've seen failed diodes that have no visible marks on their outside.