I measured the voltage with the device on the beep/diode mode and Without me noticing, since then the device started to fail When measuring anything. I disassembled the device to see if there was anything burned in the board, but I did not find anything burned, and all the resistors appear to be good. But I doubt the resistance Rt1 Because it is the only one that does not show its value properly. and if anyone have an advice so I am listening.
Mod: added location clip.

 

Did you check the fuse?

 

Yes, the first thing I did was checking if the fuse good or damaged, and it is good.

 

Hi.
How to repair DT 830D, Digital Multimeter Repair at home - YouTube
Good luck.............