Proskit MT-3109 AC/DC Digital Clamp Multimeter not displaying anything

[zillah]

Dear Experts

I have got Proskit MT-3109 AC/DC Digital Clamp Multimeter, very rarely used , I needed to use it recently I realized nothing display in the screen I thought we need to replace the 3xAAA batteries
But still nothing display in the screen

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i was trying to see if any fuse blown up I removed the back cover but I couldn't see any fuse,,,,,Is it junk ?

Thx

 

[rjenkinsgb]

If you are lucky it could just be the rotary switch contacts?
Try applying a tiny amount of light oil like 3 in 1 or sewing machine oil to the contact surfaces, just wipe them with a drop on a cloth to leave a film rather than any liquid that could run.
They operate the switch end to end a few times.

You could also wipe the battery contacts after the switch to help with any surface tarnish on those.

 

[danadak]

Also usually display is connected to PCB via zebra strips. Youtube has
some help on cleaning them. I have done it with alcohol which so
far has been OK, eg. alcohol not attacking other materials.

https://www.youtube.com/results?search_query=lcd+zebra+strips

 

[zillah]

Thx guys for those tips