How multimeter detects that it is in the current measurement mode?

[trenchsoldering]

Hi,

I toasted a little bit my multi-meter Aneng Q1. 
I wanted to measure voltage, but my gadget was in current measuring mode (10A).
I short circuited 3A 48v charger.

I didn't notice the issue right away, because it didn't broke completely.
It stuck in current mode. It reacts on buttons, but I cannot choose voltage mode, because current/voltage is guided by
which port has write in.

So I have a hope that fix is not hard and I am fix it myself, but I don't have enough information about method for detecting where wire is plugged in.

What elements on PCB should I check first in this case?

Thanks

[inse]

Fuse!

[mikerj]

Multimeters that sense the probes being connected usually have split contacts in the 4mm sockets instead of a single contact.  Inserting the probe connector shorts the two contacts together.

Presumably your 3A charger was not current limited and has blown the 10A fuse.

[strawberry]

when lights turn off

[abdulbadii]

Obtain MM else, open Aneng MM up at rotary switch to find continuity of V, I after replacing fuse
check others short connections

[tooki]

Obtain MM else, open Aneng MM up at rotary switch to find continuity of V, I after replacing fuse
check others short connections

That model doesn’t have a rotary switch.

[relax]

I've had the same issue.

Check the two N-Channel Mosfets "A6SHB" (SI2306) at Q4 and Q5. I've replaced both and it works again.