UT60S change to current measurement without touching the button

[ndarjo21]

This 6 month multimeter have strange behavior. It change to current measurement mode itself. When teardown the meter i didnt see any damage. After covering trace below current mode button with a isolation tape(black tape) i havent encounter this problem again.

https://youtube.com/shorts/6ggqvz2dYH4?si=97CbYRASmro-hcVv

[ndarjo21]

it happen again. even the tape still in the place. other mode button didnt repsond. just backligh/power, hold, range, hz/% which give respond

[coromonadalix]

keypad contaminants ??

[sonpul]

UT60S has detection of correct probe connection. Perhaps the two separated halves of the uA connector are shorting each other. When they close, they command the multimeter to turn on the current measurement mode.
The contact plates themselves can short out, or something metal could get in there.

[ndarjo21]

i dont have another multimeter so didnt know how to diagnose it. but the pcb seems clean. i already resolder allmost all component with new solder in case there are bad connection but the problem still persist

[ndarjo21]

after removing the transistor/mosfet/anything. now it work in V, mV and resistance mode. the problem when measuring voltage is 500mV floating in V mode

[ndarjo21]

shorted probe in resistance or continuity show 600 ohm. in diode mode 0.1v